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Grain filling of early-season rice cultivars grown under mechanical transplanting

文献类型： 外文期刊

作者： Chen, Jiana 1 ; Cao, Fangbo 1 ; Shan, Shuanglu 1 ; Yin, Xiaohong 1 ; Huang, Min 1 ; Zou, Yingbin 1 ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Crop & Environm Res Ctr, Changsha, Peoples R China

2.Guangxi Acad Agr Sci, Rice Res Inst, Guangxi Key Lab Rice Genet & Breeding, Nanning, Peoples R China

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2019 年 14 卷 11 期

页码：

收录情况： SCI

摘要： High yields of mechanized intensive rice-based cropping systems, e.g. double-season cropping using early- and late-season rice, are important to ensure national food security in China. However, few studies addressing the relationship between grain weight and grain yield of early-season rice under machine-transplanted conditions. A field experiment was conducted to determine the critical grain-filling characteristics and related physiological aspects that contribute to high grain weight in machine-transplanted early-season rice. The results showed that grain yield was significantly positively correlated with grain weight but not with panicles per m(2), spikelets per panicle, and spikelet-filling percentage. Furthermore, this study demonstrated that there was a significant positive correlation between grain weight and mean grain-filling rate, which was significantly positively correlated with harvest index and grain cytokinin content. These results indicate that high grain-filling rate driven by good transport of assimilates to grains and strong grain sink strength is responsible for high grain weight in machine-transplanted early-season rice.

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