Grain Number, Plant Height, and Heading Date7 Is a Central Regulator of Growth, Development, and Stress Response
Grain Number, Plant Height, and Heading Date7 Is a Central Regulator of Growth, Development, and Stress Response
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粒数、株高和抽穗期7是生长、发育和应激反应的核心调节因子
DOI：
10.1104/pp.113.231308
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发表时间：
2014-02-01
期刊：
影响因子：
7.4
通讯作者：
Zhang, Qifa
中科院分区：
文献类型：
--
作者：
Weng, Xiaoyu;Wang, Lei;Zhang, Qifa
Grain number, plant height, and heading date7 (Ghd7) has been regarded as an important regulator of heading date and yield potential in rice (Oryza sativa). In this study, we investigated functions of Ghd7 in rice growth, development, and environmental response. As a long-day dependent negative regulator of heading date, the degree of phenotypic effect of Ghd7 on heading date and yield traits is quantitatively related to the transcript level and is also influenced by both environmental conditions and genetic backgrounds. Ghd7 regulates yield traits through modulating panicle branching independent of heading date. Ghd7 also regulates plasticity of tiller branching by mediating the PHYTOCHROME B-TEOSINTE BRANCHED1 pathway. Drought, abscisic acid, jasmonic acid, and high-temperature stress strongly repressed Ghd7 expression, whereas low temperature enhanced Ghd7 expression. Overexpression of Ghd7 increased drought sensitivity, whereas knock-down of Ghd7 enhanced drought tolerance. Gene chip analysis of expression profiles revealed that Ghd7 was involved in the regulation of multiple processes, including flowering time, hormone metabolism, and biotic and abiotic stresses. This study suggests that Ghd7 functions to integrate the dynamic environmental inputs with phase transition, architecture regulation, and stress response to maximize the reproductive success of the rice plant.
