Independent action of ELF3 and phyB to control hypocotyl elongation and flowering time
Independent action of ELF3 and phyB to control hypocotyl elongation and flowering time
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DOI：
10.1104/pp.122.4.1149
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发表时间：
2000-04-01
期刊：
影响因子：
7.4
通讯作者：
Millar, AJ
中科院分区：
文献类型：
--
作者：
Reed, JW;Nagpal, P;Millar, AJ
光调节植物生长的各个方面，光感受器光敏色素 B (phyB) 介导对红光的许多反应。在筛选与 phyB 突变体表型相似的拟南芥突变体时，我们分离出两个新的 elf3 突变体。其中一种的形态表型比之前鉴定的 elf3 等位基因更弱，但在连续光照下仍会消除昼夜节律。与 phyB 突变体一样，elf3 突变体的下胚轴和叶柄伸长，开花早，并且红光响应有缺陷。然而，我们发现 elf3 突变与 phyB 无效突变、phyA 或 hy4 无效突变或 PHYB 过表达构建体具有加性相互作用，并且 elf3 突变不会阻止 phyB 的核定位。这些结果表明，要么 phyB 和 elf3 功能存在大量冗余，要么这两个基因调节不同的信号通路。
Light regulates various aspects of plant growth, and the photoreceptor phytochrome B (phyB) mediates many responses to red light. In a screen for Arabidopsis mutants with phenotypes similar to those of phyB mutants, we isolated two new elf3 mutants. One has weaker morphological phenotypes than previously identified elf3 alleles, but still abolishes circadian rhythms under continuous light. Like phyB mutants, elf3 mutants have elongated hypocotyls and petioles, flower early, and have defects in the red light response. However, we found that elf3 mutations have an additive interaction with a phyB null mutation, with phyA or hy4 null mutations, or with a PHYB overexpression construct, and that an elf3 mutation does not prevent nuclear localization of phyB. These results suggest that either there is substantial redundancy in phyB and elf3 function, or the two genes regulate distinct signaling pathways.