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Sugars, antioxidant enzymes and IAA mediate salicylic acid to prevent rice spikelet degeneration caused by heat stress

文献类型： 外文期刊

作者： Zhang, C. X. 1 ; Feng, B. H. 1 ; Chen, T. T. 1 ; Zhang, X. F. 1 ; Tao, L. X. 1 ; Fu, G. F. 1 ;

作者机构： 1.China Natl Rice Res Inst, State Key Lab Rice Biol, 359 Tiyuchang Rd, Hangzhou 310006, Zhejiang, Peoples R China

关键词： Oryza sativaL.;Heat stress;Pollen mother cell meiosis stage;Salicylic acid;Spikelet degeneration

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

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收录情况： SCI

摘要： AbstractSalicylic acid (SA) can alleviate damage to rice plants induced by heat stress, but its role in preventing spikelet degeneration under high-temperature stress has not been documented. Rice plants pretreated with SA (0–50?mmol?L?1) were subjected to heat stress at 40?°C at the pollen mother cell meiosis stage for 10 days. The results indicated that there were no significant differences in grain yields and yield components among rice plants that were exogenously sprayed with SA (0–50?mmol?L?1) under natural conditions. Under heat stress, the grain yield, spikelet number per panicle and setting rate in response to SA treatments were higher than under the control (0?mmol?L?1SA or NON-SA) treatment, especially with 1 and 10?mmol?L?1SA. A higher grain yield, spikelet number per panicle and setting rate were recorded in these two SA treatments compared with the NON-SA treatment. During this process, soluble sugars, proline, phytohormones including ABA, GA3, BRs, IAA, ZR and JA, and antioxidant enzymes, such as superoxide dismutase, peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX), were induced by SA. Moreover, soluble sugars, IAA, POD and APX in the spikelets with SA treatments were not only higher than with the NON-SA treatment but the changing patterns were also similar to that of the spikelet number per panicle under natural conditions and heat stress. Therefore, our results suggest that sugars, antioxidant enzymes and IAA might mediate SA to prevent spikelet degeneration caused by heat stress.]]>

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