期刊
PEERJ
卷 9, 期 -, 页码 -出版社
PEERJ INC
DOI: 10.7717/peerj.11218
关键词
Global warming; Rice; Grain filling; High temperature; Relative humidity; Grain weight; Grain quality
资金
- National Key Research and Development Program of China [2016YFD0300108, 2018YFD0301306, 2017YFD0301405]
- State Key Laboratory of Hybrid Rice
- Project Center of the Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University
This study conducted experiments on six rice cultivars in controlled growth chambers, revealing that RH75% combined with different temperature treatments significantly reduced grain weight, head rice rate, and chalkiness. The most heat-tolerant cultivar, R168, still showed differences in grain weight, head rice rate, and chalkiness between the two RH levels.
There is concern over the impact of global warming on rice production due increased heat stress, coupled with decreased relative humidity (RH). It is unknown how rice yield and quality are affected by heat stress and decreased RH during the grain filling stage. We conducted experiments in controlled growth chambers on six rice cultivars, varying in heat tolerance using 12 combinative treatments of three factors: two RH levels (75% and 85%), three temperature levels (the daily maximum temperature at 33 degrees C, 35 degrees C, and 37 degrees C), and two durations (8 d and 15 d after anthesis). Results showed that RH75% with temperature treatments significantly reduced grain weight, which was higher than RH85%. The same trend was also observed for both head rice rate and chalkiness. R168 was the most heat-tolerant cultivar, but it still had some differences in grain weight, head rice rate, and chalkiness between the two RH regimes. The lower RH was most detrimental at 35 degrees C, and to a lesser extent at 33 degrees C, but had a negligible effect at 37 degrees C. Our results provide a better understanding of temperature and RH's interaction effects on rice quality during the grain filling stage, suggesting that RH should be considered in heat tolerance screening and identification to facilitate rice breeding and genetic improvement.
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