Extreme Low-Temperature Stress Affects Nutritional Quality of Amino Acids in Rice

作者：Min Kang, Gurong Liu, Yaowen Zeng, Jia Zhou, Jiangyi Shi, Liang Tang, Leilei Liu, Weixing Cao, Yan Zhu, Bing Liu · 发表于：Frontiers in Plant Science · 年份：2022 · DOI：10.3389/fpls.2022.905348 · 被引用次数：17 · 研究领域：GABA and Rice Research、Rice Cultivation and Yield Improvement、Plant Stress Responses and Tolerance

Global climate change has increased the frequency of extreme climate events, and their effects on the nutritional quality, especially on amino acids in rice, have not been quantified. The data from a 3-year low temperature stress (LTS) experiment including two rice varieties (Huaidao 5 and Nanjing 46), seven minimum/maximum temperature levels (one optimal 21/27°C and six LTS levels from 17/23 to 6/12°C), and three LTS durations (3, 6, and 9 days) after flowering, revealed significant interactive effects of LTS at different stages, durations, and temperature levels on the content and accumulation of amino acids. LTS increased rice total amino acid content, while decreasing its accumulation, with higher sensitivities to LTS at the flowering stage than at the grain filling stage. In most treatments, the lysine (the first limiting amino acid) and phenylalanine content were increased under LTS at early and peak flowering stages but decreased at the grain filling stage in both varieties, and only leucine content was increased at all three stages after flowering, while the content of other essential amino acids differed among the two varieties. With an increase of 1°C·d per day in the accumulated cold degree days, the relative content of the essential amino acids was increased by 0.01-0.41%, depending on the rice variety and growth stage. Our results suggest that LTS can improve nutritional quality of amino acids of rice grains in terms of amino acids content, especially at flowerin...