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High Nighttime Temperature Induces Antioxidant Molecule Perturbations in Heat-Sensitive and Heat-Tolerant Coisogenic Rice (Oryza sativa) Strains

Lei, Gang, Zhang, Hong-Yu, Wang, Zhao-Hai, Wei, Ling-Xia, Fu, Pei, Song, Jian-Bo, Fu, Dong-Hui, Huang, Ying-Jin, Liao, Jiang-Lin
Journal of agricultural and food chemistry 2018 v.66 no.45 pp. 12131-12140
Oryza sativa, S-adenosylmethionine, antioxidants, filling period, grain yield, heat tolerance, metabolomics, night temperature, oxidative stress, photosynthesis, rice, ripening, thermosensitivity
Global warming-associated increases in temperature, particularly at nighttime, are detrimental to rice yield and quality. Metabolomic profiling was used to examine and compare the short-term extreme high nighttime temperature-induced molecular perturbations in rice (Oryza sativa) coisogenic strains with contrasting heat-tolerances at the first stage of seed ripening. Compared to the heat-sensitive strain, antioxidant molecules were higher in abundance in the heat-tolerant strain, whereas the abundances of molecules involved in photosynthesis, nucleotide catabolism, and the S-adenosylmethionine (SAM) cycle varied only slightly. Thus, we proposed that the high abundance of antioxidant molecules in the heat-tolerant strain alleviated cellular oxidative stress, which protected photosynthesis, nucleotide catabolism, and the SAM cycle, leading to good grain filling.