Young evolutionary origins of dioecy in the genus Asparagus
Young evolutionary origins of dioecy in the genus Asparagus
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DOI：
10.1002/ajb2.16276
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发表时间：
2024-01-31
影响因子：
3
通讯作者：
Leebens-Mack，Jim
中科院分区：
文献类型：
--
作者：
Bentz，Philip C.;Liu，Zhengjie;Leebens-Mack，Jim
在被子植物的进化史上，雌雄分离已经独立进化了无数次，最近在许多谱系中得到了衍生。然而，我们的理解是有限的进化机制，推动植物中的dioclonal的起源。被子植物中双子叶植物的最近和重复进化提供了一个机会，对影响双子叶植物进化的生态，发育和分子因素进行强有力的推断，从而影响性染色体。属芦笋（天门冬科）是一个新兴的模式分类研究diodelium和性染色体进化，但估计的年龄和起源diodelium在genus.MethodsWe缺乏系统发育分析中使用plastome序列和化石时间校准调查的年龄和起源diodelium在属芦笋。我们还回顾了整个属的性系统的多样性，以解决文献中相互矛盾的报道。结果我们估计，大约278 - 378万年前，其中约27%的物种是雌雄异株，其余的是雌雄同株，花朵单斜。结论我们的研究结果支持了之前的工作，暗示了年龄较小和两种起源的可能性石刁柏属的石刁柏，这似乎与非洲以外的快速辐射和范围扩张有关。最后，我们推测，整个北方非洲的古气候振荡可能有助于为大约278 - 378万年前的芦笋中的异黄酮的起源奠定基础。
PremiseDioecy (separate sexes) has independently evolved numerous times across the angiosperm phylogeny and is recently derived in many lineages. However, our understanding is limited regarding the evolutionary mechanisms that drive the origins of dioecy in plants. The recent and repeated evolution of dioecy across angiosperms offers an opportunity to make strong inferences about the ecological, developmental, and molecular factors influencing the evolution of dioecy, and thus sex chromosomes. The genusAsparagus(Asparagaceae) is an emerging model taxon for studying dioecy and sex chromosome evolution, yet estimates for the age and origin of dioecy in the genus are lacking.MethodsWe use plastome sequences and fossil time calibrations in phylogenetic analyses to investigate the age and origin of dioecy in the genusAsparagus. We also review the diversity of sexual systems present across the genus to address contradicting reports in the literature.ResultsWe estimate that dioecy evolved once or twice approximately 2.78−3.78 million years ago inAsparagus, of which roughly 27% of the species are dioecious and the remaining are hermaphroditic with monoclinous flowers.ConclusionsOur findings support previous work implicating a young age and the possibility of two origins of dioecy inAsparagus, which appear to be associated with rapid radiations and range expansion out of Africa. Lastly, we speculate that paleoclimatic oscillations throughout northern Africa may have helped set the stage for the origin(s) of dioecy inAsparagusapproximately 2.78−3.78 million years ago.