The effects of phytochrome-mediated light signals on the developmental acquisition of photoperiod sensitivity in rice.
The effects of phytochrome-mediated light signals on the developmental acquisition of photoperiod sensitivity in rice.
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DOI：
10.1038/srep07709
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发表时间：
2015-01-09
影响因子：
4.6
通讯作者：
Tanisaka T
中科院分区：
文献类型：
--
作者：
Yoshitake Y;Yokoo T;Saito H;Tsukiyama T;Quan X;Zikihara K;Katsura H;Tokutomi S;Aboshi T;Mori N;Inoue H;Nishida H;Kohchi T;Teraishi M;Okumoto Y;Tanisaka T
植物通常依靠光周期性来控制开花时间。水稻成花前的发育可分为两个连续的阶段：基本营养生长期（BVP）和光周期敏感期（PSP）。负责水稻植物进入其光周期敏感状态的过渡机制仍然是难以捉摸的。通过光谱分析和光形态发生分析，我们发现极早开花突变体X61中的se13是OsHY2的一个无义突变基因，该基因编码植物色素移动素（PΦB）合成酶。我们证明了一些开花时间和生物钟基因在BVP和PSP中具有不同的表达谱，这种现象主要是由不同的光敏色素介导的光信号需求引起的：在BVP中，光敏色素介导的光信号直接抑制Ehd2，而在PSP中，光敏色素介导的光信号通过生物钟基因的表达激活Hd1和Ghd7的表达。这些结果表明，在水稻开花过程中，对应于BVP和PSP的两个不同发育阶段，光敏色素的光感受性是不同的。我们的研究结果表明，这些差异可能参与了水稻光周期敏感性的获得。
Plants commonly rely on photoperiodism to control flowering time. Rice development before floral initiation is divided into two successive phases: the basic vegetative growth phase (BVP, photoperiod-insensitive phase) and the photoperiod-sensitive phase (PSP). The mechanism responsible for the transition of rice plants into their photoperiod-sensitive state remains elusive. Here, we show that se13, a mutation detected in the extremely early flowering mutant X61 is a nonsense mutant gene of OsHY2, which encodes phytochromobilin (PΦB) synthase, as evidenced by spectrometric and photomorphogenic analyses. We demonstrated that some flowering time and circadian clock genes harbor different expression profiles in BVP as opposed to PSP, and that this phenomenon is chiefly caused by different phytochrome-mediated light signal requirements: in BVP, phytochrome-mediated light signals directly suppress Ehd2, while in PSP, phytochrome-mediated light signals activate Hd1 and Ghd7 expression through the circadian clock genes' expression. These findings indicate that light receptivity through the phytochromes is different between two distinct developmental phases corresponding to the BVP and PSP in the rice flowering process. Our results suggest that these differences might be involved in the acquisition of photoperiod sensitivity in rice.
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影响因子：
7.4
作者：
Kim, Song Lim;Lee, Shinyoung;An, Gynheung
通讯作者：
An, Gynheung
DOI：
10.1073/pnas.1221738110
发表时间：
2013-01-22
影响因子：
11.1
作者：
Hu, Wei;Franklin, Keara A.;Lagarias, J. Clark
通讯作者：
Lagarias, J. Clark
影响因子：
3.1
作者：
Fujino, K;Sekiguchi, H;Kiguchi, T
通讯作者：
Kiguchi, T
影响因子：
7.2
作者：
Komari, T;Hiei, Y;Kumashiro, T
通讯作者：
Kumashiro, T
影响因子：
64.8
作者：
Hayama, R;Yokoi, S;Shimamoto, K
通讯作者：
Shimamoto, K