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 (H₂O₂) 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 H₂O₂ signaling in response to heat stress in rice (Oryza sativa L.).

Conclusions

PSL50 negatively regulates heat-induced premature leaf senescence in rice.

中文翻译：

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提前衰老 LEAF 50 促进水稻 (Oryza sativa L.) 的热应激耐受性

背景

热应激是可能导致植物叶片过早衰老的主要环境因素。迄今为止，一些水稻早衰叶片突变体已被报道与耐热性有关。

发现

我们鉴定了一种过早衰老的 leaf 50 ( psl50 ) 突变体，与野生型相比，该突变体表现出更高的热敏感性，存活率降低，过氧化氢 (H ₂ O ₂ ) 含量过度积累，热应激下细胞死亡增加。通过使用基于图谱的重测序（IMBR）方法分离出致病基因PREMATURE SENESCENCE LEAF 50 ( PSL50 )，我们发现PSL50可能通过作为响应热应激的 H ₂ O ₂信号传导调节剂来促进耐热性。水稻（Oryza sativa L.）。

结论

PSL50负向调节水稻热诱导的叶片早衰。