Regulation of Leaf Senescence and Crop Genetic Improvement

文献类型： 外文期刊

第一作者： Wu, Xiao-Yuan

作者： Wu, Xiao-Yuan;Jing, Hai-Chun;Kuai, Ben-Ke;Kuai, Ben-Ke;Jia, Ji-Zeng

作者机构：

关键词： Leaf Senescence;photosynthesis and photoassimilates;nutrient remobilisation;senescence-associated genes;crop ideotypes

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

ISSN： 1672-9072

年卷期： 2012 年 54 卷 12 期

页码：

收录情况： SCI

摘要： Leaf senescence can impact crop production by either changing photosynthesis duration, or by modifying the nutrient remobilization efficiency and harvest index. The doubling of the grain yield in major cereals in the last 50 years was primarily achieved through the extension of photosynthesis duration and the increase in crop biomass partitioning, two things that are intrinsically coupled with leaf senescence. In this review, we consider the functionality of a leaf as a function of leaf age, and divide a leaf's life into three phases: the functionality increasing phase at the early growth stage, the full functionality phase, and the senescence and functionality decreasing phase. A genetic framework is proposed to describe gene actions at various checkpoints to regulate leaf development and senescence. Four categories of genes contribute to crop production: those which regulate (I) the speed and transition of early leaf growth, (II) photosynthesis rate, (III) the onset and (IV) the progression of leaf senescence. Current advances in isolating and characterizing senescence regulatory genes are discussed in the leaf aging and crop production context. We argue that the breeding of crops with leaf senescence ideotypes should be an essential part of further crop genetic improvement. [ Hai-Chun Jing (Corresponding author)]

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