Characterization and fine-mapping of a novel premature leaf senescence mutant yellow leaf and dwarf 1 in rice

文献类型： 外文期刊

第一作者： Qin, Peng

作者： Qin, Peng;Liu, Zhi;Wang, Geling;Chen, Weilan;Tu, Bin;Sun, Yuantao;Chen, Xuewei;Wang, Yuping;Li, Shigui;Ma, Bingtian;Qin, Peng;Tu, Bin;Wang, Yuping;Li, Shigui;Ma, Bingtian;Deng, Luchang;Tan, Jun;Liu, Zhi;Tong, Jianhua;Xiao, Langtao;Yan, Wei;He, Hang

作者机构：

关键词： Leaf senescence;Chloroplast;Salicylic acid;MutMap

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

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收录情况： SCI

摘要： Leaves are the main organs in which photosynthates are produced. Leaf senescence facilitates the translocation of photosynthates and nutrients from source to sink, which is important for plant development and especially for crop yield. However, the molecular mechanism of leaf senescence is unknown. Here, we identified a mutant, yellow leaf and dwarf 1 (yldl), which exhibited decreased plant height and premature leaf senescence. Nitroblue tetrazolium and diamiobenzidine staining analyses revealed that the concentrations of reactive oxygen species were higher in yldl leaves than in wild type leaves. The photosynthetic pigment contents were significantly decreased in yldl. The yldl chloroplasts had collapsed and were filled with abnormal starch granules. Combining bulk segregant and MutMap gene mapping approaches, the mutation responsible for the yldl phenotype was mapped to a 73 Mb centromeric region, and three non -synonymous single nucleotide polymorphisms located in three novel genes were identified in this region. The expression patterns of the three candidate genes indicated that LOC_0s06g29380 had the most potential for functional verification. Plant hormone measurements showed that salicylic acid was highly accumulated in yldl leaves when compared with wild type leaves, and yldl was more sensitive to salicylic acid than wild type. This work lays the foundation for understanding the molecular regulatory mechanism of leaf senescence, and may reveal new connections among the molecular pathways related to leaf senescence, starch metabolism and salicylic acid signaling. (C) 2016 Elsevier Masson SAS. All rights reserved.

分类号： Q945`Q946

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