期刊
RICE
卷 13, 期 1, 页码 -出版社
SPRINGEROPEN
DOI: 10.1186/s12284-020-00379-3
关键词
Oryza sativa L; Rolled leaf; Heat stress; Abscisic acid; Tissue temperature; Energy homeostasis
类别
资金
- National Food Science and Technology Project [2017YFD0300100]
- National Natural Science Foundation of China [31570184, 31671619, 31561143003]
- Zhejiang Provincial Natural Science Foundation, China [LQ18C130003, LY19C130006]
- Central Public Interest Research Institute Special Fund in China [2017RG004-1]
- National Rice Industry Technology System [CARS-1]
Background Abscisic acid (ABA) acts as a signaling hormone in plants against abiotic stress, but its function in energy homeostasis under heat stress is unclear. Results Two rice genotypes, Nipponbare (wild-type, WT) with flat leaves and its mutant high temperature susceptibility (hts) plant with semi-rolled leaves, were subjected to heat stress. We found significantly higher tissue temperature, respiration rate, and ABA and H2O2 contents in leaves as well as a lower transpiration rate and stomatal conductance in hts than WT plants. Additionally, increased expression of HSP71.1 and HSP24.1 as well as greater increases in carbohydrate content, ATP, NAD (H), and dry matter weight, were detected in WT than hts plants under heat stress. More importantly, exogenous ABA significantly decreased heat tolerance of hts plants, but clearly enhanced heat resistance of WT plants. The increases in carbohydrates, ATP, NAD (H), and heat shock proteins in WT plants were enhanced by ABA under heat stress, whereas these increases were reduced in hts plants. Conclusion It was concluded that ABA is a negative regulator of heat tolerance in hts plants with semi-rolled leaves by modulating energy homeostasis.
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