FLOWERING LOCUS T Improves Cucumber Adaptation to Higher Latitudes
FLOWERING LOCUS T Improves Cucumber Adaptation to Higher Latitudes
复制标题
FLOWERING LOCUS T 改善黄瓜对高纬度地区的适应
DOI：
10.1104/pp.19.01215
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发表时间：
2020-02-01
期刊：
影响因子：
7.4
通讯作者：
Huang, Sanwen
中科院分区：
文献类型：
--
作者：
Wang, Shenhao;Li, Hongbo;Huang, Sanwen
开花时间对大多数作物在驯化过程中的地理适应起着至关重要的作用。黄瓜（Cucumis sativus）是世界上主要的蔬菜作物。从南亚大陆的热带起源开始，黄瓜已经在广泛的纬度梯度上传播，但这种纬度适应和驯化黄瓜扩张的分子机制在很大程度上尚不清楚。在这里，我们报道了两个不同黄瓜群体的开花时间位点的克隆，并表明开花位点T （FT）上游的两个大缺失与更高的FT表达和更早的开花有关。我们确定这两个大的缺失是普遍的，并且在欧亚和东亚人群中独立发生。核苷酸多样性分析进一步表明，黄瓜基因组的FT位点区域包含驯化过程中选择性扫描的特征。我们的研究结果表明，在黄瓜从热带起源到高纬度地区的地理传播中，FT上游的大遗传结构变异是被选择的，并且是重要的。
Flowering time plays a crucial role in the geographical adaptation of most crops during domestication. Cucumber (Cucumis sativus) is a major vegetable crop worldwide. From its tropical origin on the southern Asian continent, cucumber has spread over a wide latitudinal cline, but the molecular mechanisms underlying this latitudinal adaptation and the expansion of domesticated cucumber are largely unclear. Here, we report the cloning of two flowering time loci from two distinct cucumber populations and show that two large deletions upstream from FLOWERING LOCUS T (FT) are associated with higher expression of FT and earlier flowering. We determined that the two large deletions are pervasive and occurred independently in Eurasian and East-Asian populations. Nucleotide diversity analysis further revealed that the FT locus region of the cucumber genome contains a signature for a selective sweep during domestication. Our results suggest that large genetic structural variations upstream from FT were selected for and have been important in the geographic spread of cucumber from its tropical origin to higher latitudes.