Polyploidy and the evolution of gender dimorphism in plants
Polyploidy and the evolution of gender dimorphism in plants
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DOI：
10.1126/science.289.5488.2335
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发表时间：
2000-09-29
期刊：
影响因子：
56.9
通讯作者：
Venable, DL
中科院分区：
文献类型：
--
作者：
Miller, JS;Venable, DL
两性二型性和多倍性是重要的进化转变，在许多植物科中反复进化。我们发现，在北美枸杞（茄科）的性别二型性已经演变成多倍体，自交亲和类群，其最近的亲属是共性，自交不亲和二倍体。这种情况在南非枸杞中独立发生。我们提出了额外的证据，这一途径的性别二型性从12个属涉及至少20个独立的进化事件。我们提出，多倍性是一个触发器的性别二型性，破坏自交不亲和性，导致近交衰退的进化未被认识到的重要性。随后，雄性不育突变体侵入并增加，因为它们不能近亲繁殖。
Gender dimorphism and polyploidy are important evolutionary transitions that have evolved repeatedly in many plant families. We show that gender dimorphism in North American Lycium (Solanaceae) has evolved in polyploid, self-compatible taxa whose closest relatives are cosexual, self-incompatible diploids. This has occurred independently in South African Lycium. We present additional evidence for this pathway to gender dimorphism from 12 genera involving at Least 20 independent evolutionary events. We propose that polyploidy is a trigger of unrecognized importance for the evolution of gender dimorphism, which operates by disrupting self-incompatibility and leading to inbreeding depression. Subsequently, male sterile mutants invade and increase because they are unable to inbreed.