Flowering time diversification and dispersal in central Eurasian wild wheat Aegilops tauschii Coss.: genealogical and ecological framework.
Flowering time diversification and dispersal in central Eurasian wild wheat Aegilops tauschii Coss.: genealogical and ecological framework.
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DOI：
10.1371/journal.pone.0003138
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发表时间：
2008-09-04
期刊：
影响因子：
3.7
通讯作者：
Kawahara, Taihachi
中科院分区：
文献类型：
--
作者：
Matsuoka, Yoshihiro;Takumi, Shigeo;Kawahara, Taihachi
开花时间是一种生殖性状，对植物的健康有重大影响。与了解花转变的分子基础方面的最新进展相反，很少有实证研究解决了有关物种内开花时间多样化的种群过程的问题。我们分析了欧亚中部野生小麦节节草叶绿体 DNA 谱系结构的开花时间变异。使用代表整个物种范围的 200 个种质。在普通花园/温室实验中，以从发芽到开花的天数衡量的开花时间从 144.0 天到 190.0 天不等（平均 161.3 天）。随后的谱系和统计分析表明：（1）在物种水平上，开花时间存在显着的纵向和纬度变化；（2）早花表型在两个种内谱系中进化；（3）在亚洲，冬季温度是影响开花时间变化的纵向临床模式的环境因素；（4）在外高加索-中东地区，一些纬度因素影响开花时间变化的地理模式。根据古气候、生物地理和遗传证据，目前物种分布范围的北部地区（末次盛冰期的温带沙漠植被 (TDV) 区内）被假设为物种保护区。冰期后从 TDV 区域向南扩散似乎是由在外高加索-中东和亚洲通过不同遗传机制进化出短花时间表型的谱系驱动的。
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.
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影响因子：
5.4
作者：
Dvorak, J;Luo, MC;Zhang, HB
通讯作者：
Zhang, HB
影响因子：
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作者：
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DOI：
10.1073/pnas.0306401101
发表时间：
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影响因子：
11.1
作者：
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通讯作者：
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DOI：
10.1073/pnas.072223799
发表时间：
2002-06-11
影响因子：
11.1
作者：
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Gornicki, P