Flowering time genes Heading date 1 and Early heading date 1 together control panicle development in rice.
Flowering time genes Heading date 1 and Early heading date 1 together control panicle development in rice.
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DOI：
10.1093/pcp/pcr059
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发表时间：
2011-06
影响因子：
4.9
通讯作者：
Izawa T
中科院分区：
文献类型：
--
作者：
Endo-Higashi N;Izawa T
虽然开花时间通常与植物大小有关，但人们对开花时间基因如何影响植物结构知之甚少。我们在不同光周期条件下种植了4个具有不同开花时间基因型的水稻品系（hd 1 ehd 1，hd 1 Ehd 1，Hd 1 ehd 1和Hd 1 Ehd 1）。通过使用导致相似开花时间的基因型处理组合，我们能够比较开花时间基因对与植物结构相关的性状的影响。结果表明，抽穗期1（Hd 1）和早抽穗期1（Ehd 1）的组合能减少穗中的一次分枝数，从而减少每穗小穗数;这与控制开花时间无关。此外，Hd 3a和水稻开花基因座T1（RFT 1）成花基因的表达上调的Hd 1 Ehd 1线在花过渡的时间在叶中。Hd 1和/或Ehd 1在穗发育过程中引起顶花1类基因的上调和穗形成相关基因在茎尖分生组织的早熟表达。因此，两个关键的开花时间基因，Hd 1和Ehd 1，可以控制穗发育在水稻中，这可能会影响作物产量在田间通过成花素在叶片中的表达。
Although flowering time is often associated with plant size, little is known about how flowering time genes affect plant architecture. We grew four rice lines having different flowering time genotypes (hd1 ehd1, hd1 Ehd1, Hd1 ehd1 and Hd1 Ehd1) under distinct photoperiod conditions. By using genotype–treatment combinations that resulted in similar flowering times, we were able to compare the effects of flowering time genes on traits related to plant architecture. The results revealed that the combination of Heading-date 1 (Hd1) and Early heading date 1 (Ehd1) can reduce the number of primary branches in a panicle, resulting in smaller spikelet numbers per panicle; this occurs independently of the control of flowering time. In addition, expression of the Hd3a and Rice Flowering-locus T 1 (RFT1) florigen genes was up-regulated in leaves of the Hd1 Ehd1 line at the time of the floral transition. We further revealed that Hd1 and/or Ehd1 caused up-regulation of Terminal Flower 1-like genes and precocious expression of panicle formation-related genes at shoot apical meristems during panicle development. Therefore, two key flowering time genes, Hd1 and Ehd1, can control panicle development in rice; this may affect crop yields in the field through florigen expression in leaf.
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