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The genus Rhododendron has been divided into some 900 plus species. Often these species hybridize in nature creating what are called hybrid swarms. Although most Rhododendron species are diploids there exists tetraploid, hexaploid, octaploid, and decaploid Rhododendron species. Contact zones between Rhododendron species containing diploid and tetraploids ...


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In the genus Rhododendron polyploid species are common especially in deciduous azaleas and lepidotes. Yet complete reproductive isolation of the poylpoid species from the closely related diploid species is the exception rather than the rule. Closely related diploid and tetraploid species interact in natural contact zones to create triploids and some ...


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Ploidy and reproductive isolation in plants Speaking generally, there is simply no question that for flowering plants there can be a sexual pathway between diploid and polyploidy levels. The question is how wide is the bridge and how much flow is there in either direction. In other words the questions become "How much flow?", "How meaningful the flow?", ...


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Depending on the species the hability of generating hybrids will be different. Some can, others don't. However generating a hybrid of a diploid and a tetraploid will give rise to a triploid, usually sterile plants (as it happens with seedless whatermelons, which are a cross between tetraploid and diploid). This is where most of the isolation comes from, ...



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