Detrimental effects of heat stress on grain weight and quality in rice ( Oryza sativa L.) are aggravated by decreased relative humidity

PeerJ

article

Haoliang Yan¹  Chunhu Wang¹  Ke Liu¹  Xiaohai Tian¹ 

[1] Hubei Collaborative Innovation Center for Grain Industry/College of Agriculture, Yangtze University

关键词: Global warming;    Rice;    Grain filling;    High temperature;    Relative humidity;    Grain weight;    Grain quality;   

DOI  :  10.7717/peerj.11218

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

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 °C, 35 °C, and 37 °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 °C, and to a lesser extent at 33 °C, but had a negligible effect at 37 °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.

【 授权许可】

CC BY