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Physiological and Cytological Analyses of the Thousand-Grain Weight in 'Zhongyan96-3' Wheat

文献类型： 外文期刊

作者： Li, Luhua 1 ; Yang, Shuai 3 ; Wang, Zhongni 4 ; Ren, Mingjian 1 ; An, Chang 1 ; Xiong, Fumin 1 ; Chen, Yuxuan 1 ; Xu, Ruhong 1 ;

作者机构： 1.Guizhou Univ, Coll Agr, Guiyang 550025, Peoples R China

2.Guizhou Sub Ctr Natl Wheat Improvement Ctr, Guiyang 550025, Peoples R China

3.Tongren Acad Agr Sci, Tongren 554300, Peoples R China

4.Guizhou Acad Agr Sci, Guizhou Rice Res Inst, Guiyang 550006, Peoples R China

关键词： Thousand-grain weight; Grain-filling rate; Genes; Wheat yield

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.64； 五年影响因子：4.469 ）

ISSN： 0721-7595

年卷期：

页码：

收录情况： SCI

摘要： Wheat-yield improvement is pivotal for meeting the food demands of an increasing global population. Thousand-grain weight (TGW) is a main component of wheat grain yield, and the grain-filling rate (GFR) is a crucial trait that determines the grain weight. Here, we aimed to clarify the natural development of the excellent characteristics of faster GFR and greater TGW in 'Zhongyan96-3' (ZY96-3) wheat by observing grain-filling parameters, identifying grain histological features, and analyzing related gene expression levels. ZY96-3 has the strong advantages of early maturity, a fast GFR and high TGW than its parents 'Guinong 19' (GN19) and 'Chinese Spring Wheat' (CSW). Here, we found that ZY96-3 possessed a greater TGW than GN19 and CSW after 10 days post-anthesis during different grain developmental periods. The TGW was positively correlated with GFR (including the mean and maximum values) and the secondary grain-filling parameters of GFR, including the rapid and slight increase stages. Interestingly, the seed coat cells formed a compact layer in ZY96-3 later than in GN19 and CSW. Additionally, ZY96-3 possessed larger A-granules than GN19 and CSW by 16.27% and 38.83%, respectively. In particular, dynamic changes in starch-, grain size-, and protein-related gene expression levels were consistent with the dynamic TGW changes during grain developmental periods. Thus, our findings indicated that ZY96-3 possessed a greater TGW owing to larger GFR parameters and higher starch and protein biosynthesis capacities than GN19 and CSW; therefore ZY96-3 may be an important germplasm resource for wheat-yield improvement.

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