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- Title
Grain filling of early-season rice cultivars grown under mechanical transplanting.
- Authors
Chen, Jiana; Cao, Fangbo; Shan, Shuanglü; Yin, Xiaohong; Huang, Min; Zou, Yingbin
- Abstract
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.
- Subjects
CHINA; RICE; CYTOKININS; CULTIVARS; CROPPING systems; GRAIN yields; FOOD security; HYBRID rice; GRAIN
- Publication
PLoS ONE, 2019, Vol 14, Issue 11, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0224935