Harbert Robert S, Brown Anthony H D, Doyle Jeff J
Cornell University, Department of Plant Biology, 412 Mann Library, Cornell University, Ithaca, New York 14853 USA.
Am J Bot. 2014 Apr;101(4):710-21. doi: 10.3732/ajb.1300417. Epub 2014 Apr 3.
Polyploid plants, when compared with diploids, show similar molecular, morphological, physiological, and ecological tendencies across unrelated groups, but the degree to which these form "rules" of polyploid evolution are unclear. The Glycine (Leguminosae) allopolyploid complex affords the opportunity to test whether polyploidy in similar genetic backgrounds produces similar effects on geographical range or climatic space.
We used information on locality presence of four closely related Glycine allopolyploid species and their diploid progenitors to build models of the potentially available Australian ranges based on climate using Maxent3.3.3k. Principal coordinate analysis was used to characterize the multidimensional climate space occupied by each species.
Each of the four Glycine allopolyploids showed intermediacy in potential geographical space and in ecological space, relative to its diploid progenitors. The four allopolyploids did not have consistently larger ranges than their progenitors, though all four occupied a portion of climate niche space not available to its progenitors. The polyploids also differed in their exploitation of potentially available geographical range. Australian ranges and environmental space did not correlate with greater colonizing ability in these polyploids.
The four Glycine allopolyploids do not show many common range- or climate-related features, other than intermediacy. Thus, despite their similar genetic and evolutionary backgrounds, polyploidy has not produced convergent ecological effects.
与二倍体植物相比，多倍体植物在不相关的类群中表现出相似的分子、形态、生理和生态趋势，但这些趋势形成多倍体进化“规则”的程度尚不清楚。大豆（豆科）异源多倍体复合体为检验相似遗传背景下的多倍体是否对地理范围或气候空间产生相似影响提供了机会。
我们利用四种亲缘关系密切的大豆异源多倍体物种及其二倍体祖先的产地信息，使用Maxent3.3.3k基于气候构建澳大利亚潜在可用范围的模型。主坐标分析用于表征每个物种所占据的多维气候空间。
相对于其二倍体祖先，四种大豆异源多倍体在潜在地理空间和生态空间中均表现出中间性。尽管这四种异源多倍体都占据了其祖先无法利用的部分气候生态位空间，但它们的分布范围并不始终比其祖先更大。这些多倍体在对潜在可用地理范围的利用上也存在差异。澳大利亚的分布范围和环境空间与这些多倍体更强的定殖能力无关。
除了中间性之外，这四种大豆异源多倍体并没有表现出许多与分布范围或气候相关的共同特征。因此，尽管它们具有相似的遗传和进化背景，但多倍体并未产生趋同的生态效应。
