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Jasmonates alleviate spikelet‐opening impairment caused by high temperature stress during anthesis of photo‐thermo‐sensitive genic male sterile rice lines
Food and Energy Security ( IF 4.0 ) Pub Date : 2020-07-14 , DOI: 10.1002/fes3.233 Jianchang Yang 1 , Keqi Fei 1 , Jing Chen 1 , Zhiqin Wang 1 , Weiyang Zhang 1 , Jianhua Zhang 2, 3
Food and Energy Security ( IF 4.0 ) Pub Date : 2020-07-14 , DOI: 10.1002/fes3.233 Jianchang Yang 1 , Keqi Fei 1 , Jing Chen 1 , Zhiqin Wang 1 , Weiyang Zhang 1 , Jianhua Zhang 2, 3
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Hybrids produced by photo‐thermo‐sensitive genic male sterile (PTSGMS) rice (Oryza sativa L.) lines crossed with restorer lines have huge heterosis. However, PTSGMS rice lines show serious spikelet‐opening impairment as high temperature (HT) stress occurs during anthesis. Its physiological mechanism remains unclear. Jasmonates (JAs) are novel phytohormones and play important roles in responses to biotic and abiotic stresses. This study investigated whether and how JAs mediate the effect of HT stress during anthesis on spikelet‐opening of PTSGMS rice lines. Three PTSGMS rice lines were pot‐grown and subjected to HT stress during anthesis. The concentrations of jasmonic acid (JA), methyl jasmonate (MeJA), hydrogen peroxide (H2O2), ascorbic acid (AsA), and soluble sugars and activities of catalase and α‐amylase in the lodicules that locate at the base inside the lemma and function spikelet‐opening were determined. The results showed that increases or decreases in JA and MeJA concentrations in the lodicules under HT stress varied with PTSGMS lines. A PTSGMS line with higher JA and MeJA concentrations under HT stress exhibited a higher opened‐spikelet rate and also showed a higher fertilized‐spikelet rate and a higher seed yield when the line was crossed with a restorer line. Both JA and MeJA concentrations were very significantly (p = .01) and positively correlated with AsA concentrations and activities of catalase and α‐amylase, whereas were negatively correlated with H2O2 concentration. Increases in concentrations of JAs in lodicules by applying JA or MeJA under HT stress during anthesis significantly increased activities of catalase and α‐amylase and concentrations of AsA and soluble sugars, and significantly decreased H2O2 concentration in the lodicules, and, accordingly, increased opened‐spikelet rate. The results suggest that JAs play an important role in alleviating spikelet‐opening impairment caused by HT stress during anthesis through enhancing antioxidant ability and osmotic regulation in the lodicules of PTSGMS rice lines.
中文翻译：
茉莉酮缓解光热敏基因雄性不育水稻花期高温胁迫引起的小穗开放性损伤
由光热敏基因雄性不育水稻（PTSGMS）水稻（Oryza sativa L.）系与恢复系杂交产生的杂种具有巨大的杂种优势。但是，PTSGMS水稻系显示出严重的小穗开放性受损，因为在开花期出现高温（HT）胁迫。其生理机制仍不清楚。茉莉酸酯（JAs）是新型植物激素，在对生物和非生物胁迫的响应中起重要作用。这项研究调查了JAs是否以及如何介导花期HT胁迫对PTSGMS水稻小穗开放的影响。将三株PTSGMS水稻株系盆栽，并在开花期承受HT胁迫。茉莉酸（JA），茉莉酸甲酯（MeJA），过氧化氢（H 2 O 2），抗坏血酸（AsA）和可溶性糖以及位于外内基部的子房中过氧化氢酶和α-淀粉酶的活性，并确定了小穗开放的功能。结果表明，HT胁迫下under的JA和MeJA浓度随PTSGMS品系的变化而变化。在高温胁迫下，JA和MeJA浓度较高的PTSGMS品系显示较高的开放小穗率，并且与恢复系杂交时也显示较高的受精小穗率和较高的种子产量。JA和MeJA浓度都非常显着（p = .01），并且与AsA浓度以及过氧化氢酶和α-淀粉酶的活性呈正相关，而与H 2 O 2呈负相关。浓度。在花期中，在高温胁迫下施用JA或MeJA可以增加lo中JAs的浓度，从而显着提高过氧化氢酶和α-淀粉酶的活性以及AsA和可溶性糖的浓度，并显着降低the中的H 2 O 2浓度，因此，开小尖峰率增加。结果表明，JAs通过增强PTSGMS水稻品系的抗氧化能力和渗透调节，在缓解花期HT应激引起的小穗开放性损伤中发挥重要作用。
更新日期：2020-07-14
中文翻译：
茉莉酮缓解光热敏基因雄性不育水稻花期高温胁迫引起的小穗开放性损伤
由光热敏基因雄性不育水稻（PTSGMS）水稻（Oryza sativa L.）系与恢复系杂交产生的杂种具有巨大的杂种优势。但是，PTSGMS水稻系显示出严重的小穗开放性受损，因为在开花期出现高温（HT）胁迫。其生理机制仍不清楚。茉莉酸酯（JAs）是新型植物激素，在对生物和非生物胁迫的响应中起重要作用。这项研究调查了JAs是否以及如何介导花期HT胁迫对PTSGMS水稻小穗开放的影响。将三株PTSGMS水稻株系盆栽，并在开花期承受HT胁迫。茉莉酸（JA），茉莉酸甲酯（MeJA），过氧化氢（H 2 O 2），抗坏血酸（AsA）和可溶性糖以及位于外内基部的子房中过氧化氢酶和α-淀粉酶的活性，并确定了小穗开放的功能。结果表明，HT胁迫下under的JA和MeJA浓度随PTSGMS品系的变化而变化。在高温胁迫下，JA和MeJA浓度较高的PTSGMS品系显示较高的开放小穗率，并且与恢复系杂交时也显示较高的受精小穗率和较高的种子产量。JA和MeJA浓度都非常显着（p = .01），并且与AsA浓度以及过氧化氢酶和α-淀粉酶的活性呈正相关，而与H 2 O 2呈负相关。浓度。在花期中，在高温胁迫下施用JA或MeJA可以增加lo中JAs的浓度，从而显着提高过氧化氢酶和α-淀粉酶的活性以及AsA和可溶性糖的浓度，并显着降低the中的H 2 O 2浓度，因此，开小尖峰率增加。结果表明，JAs通过增强PTSGMS水稻品系的抗氧化能力和渗透调节，在缓解花期HT应激引起的小穗开放性损伤中发挥重要作用。
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