Physiological and molecular studies of staygreen caused by pod removal and seed injury in soybean

文献类型： 外文期刊

第一作者： Zhang, Xinxin

作者： Zhang, Xinxin;Guo, Changhong;Zhang, Xinxin;Wang, Min;Wu, Tingting;Wu, Cunxiang;Jiang, Bingjun;Han, Tianfu

作者机构：

关键词： Soybean;Seed injury;Staygreen;Source-sink relationship

期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）

ISSN： 2095-5421

年卷期： 2016 年 4 卷 6 期

页码：

收录情况： SCI

摘要： Leaves provide substances and signals for pod and seed development in soybean. However, the regulatory feedbacks of pod and seed to leaf development remain unclear. We investigated the effects of pod and seed on leaf senescence by conducting pod removal and seed injury experiments. Pod removal and seed injury delayed leaf senescence and caused the staygreen phenotype of leaves. There were dosage effects of pod number on the extent of staygreen in depodded plants. The concentrations of chlorophyll (SPAD value, an index of relative chlorophyll content), soluble protein, and soluble sugar in the leaves of depodded plants were higher than those of intact plants. During seed development, the content of IAA decreased, while that of ABA increased. This trend was more pronounced in intact than in depodded and seed-injured plants. The GA3/ABA ratio decreased gradually in all treatments. The content of GA3 was relatively stable and was higher in intact than in depodded plants. The expression levels of four senescence-related genes, GmSARK, GmSGR1, GmCYN1, and GmNAC, declined in depodded or seed-injured treatments and were positively correlated with the number of leaves retained on plants. GmFT2a, the major flowering-promoting gene, was expressed at a higher level while E1, a key flowering inhibitory gene, was expressed at a lower level in depodded than in intact plants. We propose that the pod or seed can regulate leaf development. When the seed is aborted owing to disease infection or pest attack, the leaves stay green because of the absence of the seed signals for senescence. (C) 2016 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V.

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