Vernalization sensitivity in Arabidopsis thaliana (brassicaceae):: The effects of latitude and FLC variation
Vernalization sensitivity in Arabidopsis thaliana (brassicaceae):: The effects of latitude and FLC variation
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DOI：
10.3732/ajb.92.10.1701
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发表时间：
2005-10-01
影响因子：
3
通讯作者：
Schmitt, J
中科院分区：
文献类型：
--
作者：
Stinchcombe, JR;Caicedo, AL;Schmitt, J
气候的纬度变化预计会选择对环境线索的敏感性的纬度差异，这些环境线索向植物发出信号，在给定气候的适当时间开花。在拟南芥中，暴露于低温（春化）可促进开花，并且已知几个春化途径基因座。为了测试春化敏感性的自然变化是否可以解释先前观察到的拟南芥开花时间的纬度梯度，我们将 21 个欧洲种质暴露于 0、10、20 或 30 天的春化，并在生长室中观察短日照下开花时的叶数。我们观察到春化敏感性存在显着的纬度梯度：南方种质对春化作用比北方种质更敏感。此外，在没有春化的情况下开花较晚的种质对春化线索更敏感。开花时间调节基因FLC的等位基因变异与平均春化敏感性无关，但一类等位基因在春化敏感性方面表现出更大的变异。
Latitudinal variation in climate is predicted to select for latitudinal differentiation in sensitivity to the environmental cues that signal plants to flower at the appropriate time for a given climate. In Arabidopsis thaliana, flowering is promoted by exposure to cold temperatures (vernalization), and several vernalization pathway loci are known. To test whether natural variation in vernalization sensitivity could account for a previously observed latitudinal cline in flowering time in A. thaliana, we exposed 21 European accessions to 0, 10, 20, or 30 d of vernalization and observed leaf number at flowering under short days in a growth chamber. We observed a significant latitudinal cline in vernalization sensitivity: southern accessions were more sensitive to vernalization than northern accessions. In addition, accessions that were late flowering in the absence of vernalization were more sensitive to vernalization cues. Allelic variation at the flowering time regulatory gene FLC was not associated with mean vernalization sensitivity, but one allele class exhibited greater variance in vernalization sensitivity.