Genetic factors associated with mating system cause a partial reproductive barrier between two parapatric species of leavenworthia (brassicaceae).
Genetic factors associated with mating system cause a partial reproductive barrier between two parapatric species of leavenworthia (brassicaceae).
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DOI：
10.3732/ajb.0900184
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发表时间：
2010-03
影响因子：
3
通讯作者：
Mauricio R
中科院分区：
文献类型：
--
作者：
Koelling VA;Mauricio R
生殖障碍通过限制物种之间的基因流动，在生物多样性的起源和维持中发挥着重要作用。尽管合子前和合子后障碍通常会隔离物种，但合子前障碍被认为对生殖隔离贡献更大。我们研究了Leavenworthia alabamica和L. crassa之间可能存在的生殖障碍，这两种近亲物种具有高度的形态和生态相似性以及杂交能力。通过温室和田间实验，我们测试了栖息地隔离和遗传不相容性。从受控杂交中，我们发现了单侧不亲和性（与自体不亲和系统相关的部分合子前障碍），但没有其他遗传不亲和性的证据。我们在一项普通的花园实验中发现，与 L. alabamica 和 L. crassa 相比，F1 杂种的花粉活力略有下降，并且 F1、F2 和 BC 杂种的早期发芽率相对于 L. alabamica 和 L. crassa 有所降低，但对适应性的影响尚未测试。需要对杂交花粉活力和发芽进行实地研究，以确定它们是否有助于生殖隔离。在相互移植中，我们没有发现栖息地隔离或杂交存活（从幼苗到成年阶段）或繁殖减少的证据。这些数据表明单侧不亲和性部分地生殖分离了阿拉巴马乳杆菌和粗糙乳杆菌，但没有检测到其他生殖障碍。
Reproductive barriers play a major role in the origin and maintenance of biodiversity by restricting gene flow between species. Although both pre- and postzygotic barriers often isolate species, prezygotic barriers are thought to contribute more to reproductive isolation. We investigated possible reproductive barriers between Leavenworthia alabamica and L. crassa, parapatric species with high morphological and ecological similarity and the ability to hybridize. Using greenhouse and field experiments, we tested for habitat isolation and genetic incompatibilities. From controlled crosses, we identified unilateral incompatibility (a partial prezygotic barrier associated with the self-incompatibility system), but no evidence of other genetic incompatibilities. We found a small reduction in pollen viability of F1 hybrids and early germination of F1, F2, and BC hybrids relative to L. alabamica and L. crassa in a common garden experiment, but the effect on fitness was not tested. Field studies of hybrid pollen viability and germination are needed to determine if they contribute to reproductive isolation. In a reciprocal transplant, we found no evidence of habitat isolation or reduced hybrid survival (from seedling to adult stage) or reproduction. These data suggest unilateral incompatibility partially reproductively isolates L. alabamica and L. crassa, but no other reproductive barriers could be detected.
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DOI：
10.2307/2481536
发表时间：
1945-01-01
期刊：
BULL TORREY BOT CLUB
影响因子：
--
作者：
Baldwin, J. T.
通讯作者：
Baldwin, J. T.
影响因子：
--
作者：
CAUDLE, C;BASKIN, JM
通讯作者：
BASKIN, JM
影响因子：
3.8
作者：
GRUN, P;RADLOW, A
通讯作者：
RADLOW, A
影响因子：
9.4
作者：
BRADSHAW, A. D.
通讯作者：
BRADSHAW, A. D.
影响因子：
1.9
作者：
ANTONOVICS, J
通讯作者：
ANTONOVICS, J