Seed germination of Caragana species from different regions is strongly driven by environmental cues and not phylogenetic signals.
Seed germination of Caragana species from different regions is strongly driven by environmental cues and not phylogenetic signals.
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来自不同地区的锦鸡儿属物种的种子萌发很大程度上是由环境因素驱动的，而不是系统发育信号
DOI：
10.1038/s41598-017-11294-x
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发表时间：
2017-09-12
影响因子：
4.6
通讯作者：
Turner NC
中科院分区：
文献类型：
--
作者：
Fang XW;Zhang JJ;Xu DH;Pang J;Gao TP;Zhang CH;Li FM;Turner NC
种子萌发行为是影响物种分布的重要因素。许多研究表明，种子萌发是由系统发育制约因素控制的，然而，目前还不清楚是系统发育制约因素还是环境因素解释了一个属的种子萌发来自一个共同的祖先。在这项研究中，种子萌发在不同的温度和水分制度[诱导不同的渗透势的聚乙二醇（PEG）]在干旱，半干旱，半湿润和湿润环境中茁壮成长的锦鸡儿属植物进行了调查。结果表明，干旱生境的种子最终发芽率（FPG）为95%，而湿润生境的种子最终发芽率为0%，但没有明显的系统发育信号。相反，种子萌发的温度和PEG的反应变化很大，从干旱到潮湿的栖息地的物种，是紧密相连的物种的生态位，他们的种皮结构和脱落酸浓度。这些发现与以下假设并不一致：在一个科或属内，种子萌发策略可以是一个稳定的进化特征，从而限制了种间变异，但结果清楚地表明，分布在一系列栖息地的锦鸡儿种的种子萌发已经适应了该栖息地的环境。
Seed germination behavior is an important factor in the distribution of species. Many studies have shown that germination is controlled by phylogenetic constraints, however, it is not clear whether phylogenetic constraints or environmental cues explain seed germination of a genus from a common ancestor. In this study, seed germination under different temperature- and water-regimes [induced by different osmotic potentials of polyethylene glycol (PEG)] was investigated in the phylogenetically-relatedCaraganaspecies that thrive in arid, semiarid, semihumid and humid environments. The results showed that the final percentage germination (FPG) decreased from 95% in species from arid habitats to 0% in species from humid habitats, but with no significant phylogenetic signal. Rather, the response of seed germination to temperature and PEG varied greatly with species from arid to humid habitats and was tightly linked to the ecological niche of the species, their seed coat structure and abscisic acid concentration. The findings are not consistent with the hypothesis that within a family or a genus, seed germination strategies can be a stable evolutionary trait, thus constraining interspecific variation, but the results clearly show that seed germination ofCaraganaspecies distributed across a range of habitats has adapted to the environment of that habitat.
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