tag:blogger.com,1999:blog-260398552024-03-21T17:53:06.950-07:00Rosebay BlogAmerican Rhododendron Society Massachusetts Chapter Rosebay BlogUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comBlogger281999tag:blogger.com,1999:blog-26039855.post-7403436123601542372011-11-13T01:18:00.001-08:002012-01-29T09:46:48.766-08:00Rhododendron columbianum is a Diploid<em>Rhododendron columbianum</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal<br /><br /><em>Rhododendron columbianum</em> is often documented as being a hybrid between <em>Rhododendron groenlandicum</em> and <em>Rhododendron neoglandulosum</em>. Since <em>Rhododendron groenlandicum</em> and <em>Rhododendron neoglandulosum</em> are tetraploid, <em>Rhododendron columbianum</em>, being diploid, is most likely a separate species. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron columbianum</em>,<br />Diploid <em>Rhododendron subarticum</em>,<br />Diploid <em>Rhododendron subulatum</em> China,<br />Tetraploid <em>Rhododendron diversipilosum</em>,<br />Tetraploid <em>Rhododendron diversipilosum</em> 'Milky Way',<br />Tetraploid <em>Rhododendron groenlandicum</em>,<br />Tetraploid <em>Rhododendron groenlandicum</em> Saco Bog, Maine,<br />Tetraploid <em>Rhododendron hypoleucum</em>,<br />Tetraploid <em>Rhododendron neoglandulosum</em>,<br />Tetraploid <em>Rhododendron tolmachevii</em>,<br />Tetraploid <em>Rhododendron tomentosum</em> Turku Archipelago<br /><br />Source: Kristian Theqvist<br />Source: Hans Eiberg <br />Source: Robert MacIntyre<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-48839189010147857752011-09-08T01:24:00.000-07:002012-01-29T09:46:49.442-08:00keiskei X (spinuliferum X keiskei) is a Diploid<em>Rhododendron keiskei</em> X (<em>Rhododendron spinuliferum</em> X <em>Rhododendron keiskei</em>) has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron keiskei</em>,<br />Diploid <em>Rhododendron keiskei</em> X (<em>Rhododendron spinuliferum</em> X <em>Rhododendron keiskei</em>)<br /><br />Source: Rarefind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-54818727724459892352011-09-07T01:47:00.000-07:002012-01-29T09:46:49.453-08:00'Wisechap' is a DiploidRhododendron 'Wisechap', which is a Harry Wise hybrid documented as <em>Rhododendron mucronulatum</em> X <em>Rhododendron minus var. chapmanii</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron minus var. chapmanii</em>,<br />Diploid <em>Rhododendron mucronulatum</em>,<br />Diploid 'Wisechap'<br /><br />Source: Doug Jolley<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-19127451617249315582011-08-27T01:10:00.000-07:002012-01-29T09:46:49.599-08:00Rhododendron mucronulatum 'Waka Mirasaki' is a Diploid<em>Rhododendron mucronulatum</em> 'Waka Mirasaki' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron mucronulatum</em>,<br />Diploid <em>Rhododendron mucronulatum</em> 'Waka Mirasaki'<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-68150043184413402862011-08-25T01:25:00.000-07:002012-01-29T09:46:49.627-08:00Rhododendron minus 'Blanchette' is a Diploid<em>Rhododendron minus</em> 'Blanchette' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />No naturally occurring tetraploid <em>Rhododendron minus</em> have been located to date. <em>Rhododendron minus</em> 'Epoch', which was chemically treated to increase the ploidy level, is a tetraploid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron minus</em> 'Blanchette',<br />Diploid <em>Rhododendron minus</em> 'Mitchell Dam',<br />Diploid <em>Rhododendron minus var. chapmanii</em>,<br />Tetraploid 'Epoch'<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-13552109769601210962011-08-24T01:22:00.000-07:002012-01-29T09:46:49.641-08:00Rhododendron minus var. chapmanii is a Diploid<em>Rhododendron minus var. chapmanii</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />No naturally occurring tetraploid <em>Rhododendron minus</em> have been located to date. <em>Rhododendron minus</em> 'Epoch', which was chemically treated to increase the ploidy level, is a tetraploid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron minus</em> 'Blanchette',<br />Diploid <em>Rhododendron minus</em> 'Mitchell Dam',<br />Diploid <em>Rhododendron minus var. chapmanii</em>,<br />Tetraploid 'Epoch'<br /><br />Source: Ron Miller<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-55994416658839563042011-08-01T05:29:00.000-07:002012-01-29T09:46:49.941-08:00'Weston's Crescendo' is a DiploidRhododendron 'Weston's Crescendo', which is a Mezitt hybrid documented as a <em>Rhododendron minus</em> hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid 'Manitou'<br />Diploid 'Weston's Crescendo'<br />Diploid 'Windbeam'<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-13380242530376700262011-06-03T01:40:00.000-07:002012-01-29T09:46:50.650-08:00'Dawn's Early Light' is a DiploidRhododendron 'Dawn's Early Light', which is documented as a <em>Rhododendron keiskei</em> X <em>Rhododendron xanthocodon</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Both documented parents of Rhododendron 'Dawn's Early Light' are yellow, and the resemblance to <em>Rhododendron keiskei</em> is completely obvious, but there is little other evidence of the <em>Rhododendron xanthocodon</em> parent.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron keiskei</em>,<br />Diploid 'Dawn's Early Light'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-30527716050652815752011-06-02T01:44:00.000-07:002012-01-29T09:46:50.662-08:00Rhododendron calostrotum X carolinanum is a Diploid<em>Rhododendron calostrotum</em> X <em>Rhododendron minus</em> Carolinanum Group has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron calostrotum</em> X <em>Rhododendron minus</em> Group Carolinanum,<br />Diploid 'Robert Seleger'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-42826059029720603162011-06-01T01:00:00.000-07:002012-01-29T09:46:50.673-08:00'Robert Seleger' is a DiploidRhododendron 'Robert Seleger', which is a Dietrich Hobbie hybrid documented as a <em>Rhododendron calostrotum ssp. keleticum</em> hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron calostrotum</em> X <em>Rhododendron minus</em> Group Carolinanum,<br />Diploid 'Robert Seleger'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-56854427689618184912011-05-31T01:45:00.000-07:002012-01-29T09:46:50.685-08:00'Manitou' is a DiploidRhododendron 'Manitou', which is a Nearing hybrid documented as a 'Conestoga' hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron racemosum</em>,<br />Diploid 'Manitou',<br />Diploid 'Windbeam'<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-24978565260594596012011-05-30T01:31:00.000-07:002012-01-29T09:46:50.695-08:00'Windbeam' is a DiploidRhododendron 'Windbeam', which is a 1934 Nearing hybrid documented as a 'Conestoga' hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />In 1977 at Breeders Roundtable in Eugene, Oregon, Ellis Jones presented several reasons he suspected that 'Windbeam' was a triploid. In 1979, Gustav A. L. Mehlquist reported that 'Windbeam' was fertile.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron racemosum</em>,<br />Diploid 'Manitou',<br />Diploid 'Windbeam'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-44765011422140537872011-05-27T01:03:00.000-07:002012-01-29T09:46:50.742-08:00'Caramou' is a DiploidRhododendron 'Caramou', which is a Hardgrove hybrid documented as <em>Rhododendron minus</em> Carolinianum Group x <em>Rhododendron moupinense</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid 'Caramou'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-52406033007084937462011-05-26T01:43:00.000-07:002012-01-29T09:46:50.754-08:00'Isola Bella' is a DiploidRhododendron 'Isola Bella', which is a Brueckner hybrid documented as (<em>Rhododendron dauricum</em> 'Arctic Pearl' selfed) X <em>Rhododendron fletcherianum</em> 'Yellow Bunting', has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron dauricum</em>,<br />Diploid 'Isola Bella'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-85215919602889874362011-05-25T01:36:00.000-07:002012-01-29T09:46:50.766-08:00'Lemon Twist' is a DiploidRhododendron 'Lemon Twist', which is a Rokuyo hybrid documented as <em>Rhododendron keiskei var. ozawae</em> x <em>Rhododendron lutescens</em> 'Bagshot Sands', has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron keiskei</em>,<br />Diploid 'Lemon Twist'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-18754307800000813902011-05-24T01:29:00.000-07:002012-01-29T09:46:50.776-08:00'Dora Amateis' is a DiploidRhododendron 'Dora Amateis', which is a Amateis hybrid documented as <em>Rhododendron minus var. minus</em> x <em>Rhododendron ciliatum</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid 'Dora Amateis',<br />Diploid 'Pink Magic'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-51541865924777610512011-05-23T05:20:00.000-07:002012-01-29T09:46:50.787-08:00'Pink Magic' is a DiploidRhododendron 'Pink Magic', which is a Augie Kehr hybrid documented as <em>Rhododendron minus var. chapmanii</em> x <em>Rhododendron ciliatum</em> pink form, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron minus var. chapmanii</em>,<br />Diploid 'Dora Amateis',<br />Diploid 'Pink Magic'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-39978265111690623582011-05-21T01:03:00.000-07:002012-01-29T09:46:50.813-08:00Rhododendron hippophaeoides 'Silver Blue' is a Diploid<em>Rhododendron hippophaeoides</em> 'Silver Blue' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron hippophaeoides</em> 'Silver Blue'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-9396914790249407982011-03-07T05:28:00.000-08:002012-01-29T09:46:51.720-08:00'Will O The Wisp' is a DiploidRhododendron 'Will O The Wisp', which is a John Thornton hybrid documentd as <em>Rhododendron minus X Rhododendron formosum</em>, has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br /><em>Rhododendron minus</em> is a diploid species.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron minus</em>,
<br />Diploid 1 seedling from <em>Rhododendron formosum X Rhododendron minus</em>,
<br />Diploid 'Will O The Wisp'
<br />
<br />Source: John Thornton
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-12973607650916103932011-03-06T08:36:00.000-08:002012-01-29T09:46:51.731-08:00Rhododendron formosum X Rhododendron minus is a DiploidOne seedling of <em>Rhododendron formosum X Rhododendron minus</em>, which is a John Thornton hybrid, has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br /><em>Rhododendron minus</em> is a diploid species.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron minus</em>,
<br />Diploid 1 seedling from <em>Rhododendron formosum X Rhododendron minus</em>,
<br />Diploid 'Will O The Wisp'
<br />
<br />Source: John Thornton
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-12598593044865647252011-02-28T05:03:00.000-08:002012-01-29T09:46:51.951-08:00Rhododendron minus 'Mitchell Dam' is a Diploid<em>Rhododendron minus</em> 'Mitchell Dam', which has large leaves and stems and has been suspected of being a tetraploid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />No naturally occurring tetraploid <em>Rhododendron minus</em> have been located to date. <em>Rhododendron minus</em> 'Epoch', which was chemically treated to increase the ploidy level, is a tetraploid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron minus</em> 'Blanchette',<br />Diploid <em>Rhododendron minus</em> 'Mitchell Dam',<br />Diploid <em>Rhododendron minus var. chapmanii</em>,<br />Tetraploid 'Epoch'<br /><br />Source: John Thornton<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-75316522090468590112011-02-21T02:30:00.000-08:002012-01-29T09:46:52.027-08:00Rhododendron subulatum China is a Diploid5 plants of <em>Rhododendron subulatum</em> from China growing at the Arnold Arboretum has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron subulatum</em> was formerly classified as subspecies of <em>Ledum palustre</em>.<br /><br />The 5 plants of <em>Rhododendron subulatum</em> tested as diploid were from northern China. <br /><br />A <em>Rhododendron tomentosum</em> wild collected from a marsh in Turku Archipelago, Finland tested as tetraploid.<br /><br />There is a very good chance that this difference in ploidy level is due to misidentification of the plant from China due to the large group of plants formerly included under <em>Ledum palustre</em> and then compounded when the Ledum genus was moved to Rhododendron.<br /><br />The plant from China is clearly a diploid "Ledum". The origin of the plant tested is well documented. This plant is still growing at the Arnold Arboretum along with 4 of its siblings.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron columbianum</em>,<br />Diploid <em>Rhododendron subarticum</em>,<br />Diploid 5 plants of <em>Rhododendron subulatum</em> China,<br />Tetraploid <em>Rhododendron diversipilosum</em>,<br />Tetraploid <em>Rhododendron diversipilosum</em> 'Milky Way',<br />Tetraploid <em>Rhododendron groenlandicum</em>,<br />Tetraploid <em>Rhododendron groenlandicum</em> Saco Bog, Maine,<br />Tetraploid <em>Rhododendron hypoleucum</em>,<br />Tetraploid <em>Rhododendron neoglandulosum</em>,<br />Tetraploid <em>Rhododendron tolmachevii</em>,<br />Tetraploid <em>Rhododendron tomentosum</em> Turku Archipelago<br /><br />Source: Arnold Arboretum Accession Number: <em>Ledum palustre</em> 389-97-A,B,C,D,E Wild collected in China <br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-2079234342375569112011-02-20T05:15:00.000-08:002012-01-29T09:46:52.037-08:00Rhododendron racemosum is a Diploid<em>Rhododendron racemosum</em> has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron racemosum</em>
<br />
<br />Source: John and Sally Perkins
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-2432161867260330362011-02-19T07:37:00.000-08:002012-01-29T09:46:52.050-08:00Rhododendron keiskei is a Diploid<em>Rhododendron keiskei</em> has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron keiskei</em>
<br />
<br />Source: John and Sally Perkins
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-74268539527226080192011-02-18T10:18:00.000-08:002012-01-29T09:46:52.060-08:00Rhododendron mucronulatum is a Diploid<em>Rhododendron mucronulatum</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron mucronulatum</em>,<br />Diploid <em>Rhododendron mucronulatum</em> 'Waka Mirasaki'<br /><br />Source: Arnold Arboretum Accession Number: 968-85<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-37580202948775101712011-02-17T12:53:00.000-08:002012-01-29T09:46:52.071-08:00Rhododendron dauricum 'Delp's Dwarf' is a Diploid<em>Rhododendron dauricum</em> 'Delp's Dwarf' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron dauricum</em> 'Delp's Dwarf'<br /><br />Source: Joe Bruso<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-78715666804144438832011-02-16T17:02:00.000-08:002012-01-29T09:46:52.082-08:00Rhododendron micranthum is a Diploid<em>Rhododendron micranthum</em> has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron micranthum</em>
<br />
<br />Source: John and Sally Perkins
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-61542194324340904722011-02-13T06:01:00.000-08:002012-01-29T09:46:52.117-08:00Rhododendron minus is a Diploid<em>Rhododendron minus</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />No naturally occurring tetraploid <em>Rhododendron minus</em> have been located to date. <em>Rhododendron minus</em> 'Epoch', which was chemically treated to increase the ploidy level, is a tetraploid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron minus</em>,<br />Diploid <em>Rhododendron minus</em> 'Blanchette',<br />Diploid <em>Rhododendron minus</em> 'Mitchell Dam',<br />Diploid <em>Rhododendron minus var. chapmanii</em>,<br />Tetraploid 'Epoch'<br /><br />Source: Arnold Arboretum Accession Number: 483-81-A<br />Source: Connecticut College Arboretum Accession Number: 81-28-C<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.com