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首页> 外文期刊>Acta Physiologiae Plantarum >Exogenous salicylic acid treatment induces cold tolerance in wheat through promotion of antioxidant enzyme activity and proline accumulation
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Exogenous salicylic acid treatment induces cold tolerance in wheat through promotion of antioxidant enzyme activity and proline accumulation

机译:外源水杨酸处理通过促进抗氧化酶活性和脯氨酸积聚来诱导小麦的耐寒性

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摘要

The phytohormone salicylic acid (SA) plays a critical role in plant development and involved in the protection of the plants against various stresses. The research was directed on the study of the effects of exogenous SA on cold tolerance, activity of antioxidant enzymes and proline (Pro) accumulation in winter wheat at low hardening temperature (4 degrees C). Exogenous application of SA (100 mu M) promoted wheat cold tolerance before hardening and during all periods of cold exposure. At 4 degrees C, the activity of superoxide dismutase (SOD), catalase (CAT) and guaiacol peroxidase(GPOD), and Pro content in wheat leaves was increased while malondialdehyde (MDA) and hydrogen peroxide (H2O2) content were increased at first and then were decreased. Moreover, the levels of TaMnSOD, TaFeSOD and TaCAT gene transcripts were increased under cold stress condition. Application of SA prevented the MDA and H2O2 accumulation during cold hardening period and promoted the activity of antioxidant enzymes and the accumulation of transcripts of their encoding genes in the leaves at normal temperature and at hardening conditions. Furthermore, the Pro level in SA-treated wheat plants was higher at 4 degrees C than at SA-untreated seedlings. These results suggested that SA improved the cold tolerance in wheat by up-regulating the activity of antioxidant enzymes and Pro accumulation.
机译:植物激素水杨酸(SA)在植物开发中发挥着关键作用,并参与保护植物免受各种应力。该研究旨在研究外源SA对低硬化温度(4℃)的冬小麦抗氧化酶和脯氨酸酶和脯氨酸(Pro)积累的影响。外源性施用SA(100μm)在硬化之前促进小麦耐寒耐受性,并且在所有冷暴露期间均。在4摄氏度下,超氧化物歧化酶(SOD),过氧化氢酶(CAT)和Guaiacol过氧化物酶(GPOD)和小麦叶中的Pro含量的活性增加,而丙二醛(MDA)和过氧化氢(H2O2)含量在第一和过氧化氢(H2O2)含量增加然后减少了。此外,在冷应激条件下增加了Tamnsod,TaFesod和Tacat基因转录物的水平。 SA在冷硬化时段中的施用预防MDA和H 2 O 2积聚,并在常温和硬化条件下促进抗氧化酶的活性及其编码基因的成绩。此外,SA处理的小麦植物中的Pro水平在4℃下较高,而不是SA-未处理的幼苗。这些结果表明,通过升压抗氧化酶和PRO积累的活性,SA通过上调活性来改善小麦的耐寒性。

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