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

Autoři: Jiana Chen aff001;  Fangbo Cao aff001;  Shuanglü Shan aff001;  Xiaohong Yin aff001;  Min Huang aff001;  Yingbin Zou aff001
Působiště autorů: Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha, China aff001;  Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China aff002
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224935


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 m2, 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.

Klíčová slova:

Agricultural production – Fertilizers – China – Panicles – Pest control – Rice – Abscisic acid – Cytokinins


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Článek vyšel v časopise


2019 Číslo 11