PREMATURE SENESCENCE LEAF 50 Promotes Heat Stress Tolerance in Rice (Oryza sativa L.)
Yan He, Xiaobo Zhang, Yongfeng Shi, Xia Xu, Liangjian Li, Jianli Wu
Abstract
Abstract Background Heat stress is a major environmental factor that could induce premature leaf senescence in plants. So far, a few rice premature senescent leaf mutants have been reported to involve in heat tolerance. Findings We identified a premature senescence leaf 50 ( psl50 ) mutant that exhibited a higher heat susceptibility with decreased survival rate, over-accumulated hydrogen peroxide (H 2 O 2 ) content and increased cell death under heat stress compared with the wild-type. The causal gene PREMATURE SENESCENCE LEAF 50 ( PSL50 ) was isolated by using initial map-based resequencing (IMBR) approach, and we found that PSL50 promoted heat tolerance probably by acting as a modulator of H 2 O 2 signaling in response to heat stress in rice ( Oryza sativa L.). Conclusions PSL50 negatively regulates heat-induced premature leaf senescence in rice.