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首页> 美国卫生研究院文献>PLoS Clinical Trials >Flowering Time Diversification and Dispersal in Central Eurasian Wild Wheat Aegilops tauschii Coss.: Genealogical and Ecological Framework
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Flowering Time Diversification and Dispersal in Central Eurasian Wild Wheat Aegilops tauschii Coss.: Genealogical and Ecological Framework

机译：欧亚中部野生小麦节节麦花期的开花时间分散和分布：系谱和生态学框架

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摘要

Timing of flowering is a reproductive trait that has significant impact on fitness in plants. In contrast to recent advances in understanding the molecular basis of floral transition, few empirical studies have addressed questions concerning population processes of flowering time diversification within species. We analyzed chloroplast DNA genealogical structure of flowering time variation in central Eurasian wild wheat Aegilops tauschii Coss. using 200 accessions that represent the entire species range. Flowering time measured as days from germination to flowering varied from 144.0 to 190.0 days (average 161.3 days) among accessions in a common garden/greenhouse experiment. Subsequent genealogical and statistical analyses showed that (1) there exist significant longitudinal and latitudinal clines in flowering time at the species level, (2) the early-flowering phenotype evolved in two intraspecific lineages, (3) in Asia, winter temperature was an environmental factor that affected the longitudinal clinal pattern of flowering time variation, and (4) in Transcaucasus-Middle East, some latitudinal factors affected the geographic pattern of flowering time variation. On the basis of palaeoclimatic, biogeographic, and genetic evidence, the northern part of current species' range [which was within the temperate desert vegetation (TDV) zone at the Last Glacial Maximum] is hypothesized to have harbored species refugia. Postglacial southward dispersal from the TDV zone seems to have been driven by lineages that evolved short-flowering-time phenotypes through different genetic mechanisms in Transcaucasus-Middle East and Asia.
机译：开花时间是一种生殖性状，对植物的适应性有重要影响。与最近了解花卉过渡的分子基础的进展相反，很少有经验研究解决有关物种内开花时间多样化的种群过程的问题。我们分析了中亚欧亚野生小麦Aegilops tauschii Coss开花时间变化的叶绿体DNA族谱结构。使用代表整个物种范围的200个种质。在普通的花园/温室实验中，从发芽到开花的天数，开花时间从144.0到190.0天（平均161.3天）不等。随后的家谱和统计分析表明（1）在物种水平上的开花时间中存在明显的纵向和纬度谱系；（2）在两个种内谱系中进化出了早期开花表型；（3）在亚洲，冬季温度是环境的（4）在Transcaucasus-Middle East中，一些纬度因素影响开花时间变异的地理格局。根据古气候，生物地理和遗传证据，假设当前物种范围的北部（在最后冰川最大时期的温带沙漠植被（TDV）区域内）藏有物种避难所。 TDV带后冰期向南的散布似乎是由沿途分布在高加索地区，中东和亚洲的不同遗传机制演化出短花期表型的谱系驱动的。

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