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:
https://doi.org/10.1371/journal.pone.0224935
Souhrn
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
Zdroje
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