Salicylic acid alleviates adverse effects of heat stress on photosynthesis through changes in proline production and ethylene formation
Salicylic acid alleviates adverse effects of heat stress on photosynthesis through changes in proline production and ethylene formation
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DOI：
10.4161/psb.26374
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发表时间：
2013-01-01
影响因子：
2.9
通讯作者：
Khan, Nafees A.
中科院分区：
文献类型：
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作者：
Khan, M. Iqbal R.;Iqbal, Noushina;Khan, Nafees A.
研究了水杨酸（SA）缓解高温胁迫对小麦光合作用的不利影响。cv WH 711.高温胁迫（40 ℃，6 h）使植物核酮糖1，5-二磷酸羧化酶（Rubisco）活性、光合氮利用效率（NUE）和净光合速率下降，脯氨酸代谢增加。SA处理（0.5 mM）通过增加γ-谷氨酰激酶（GK）和降低脯氨酸氧化酶（PROX）活性来增加脯氨酸产量，从而促进维持光合活性所必需的渗透势和水势，从而缓解热胁迫。同时，SA处理通过抑制1-氨基环丙烷羧酸（ACC）合酶（ACS）的活性，将热胁迫植物中乙烯的形成限制在最佳范围内。这导致脯氨酸代谢、氮同化和光合作用的改善。结果表明，SA与脯氨酸代谢和乙烯形成相互作用，缓解了热胁迫对小麦光合作用的不利影响。
We investigated the potential of salicylic acid (SA) in alleviating the adverse effects of heat stress on photosynthesis in wheat (Triticum aestivum L.) cv WH 711. Activity of ribulose 1,5-bisphosphate carboxylase (Rubisco), photosynthetic-nitrogen use efficiency (NUE), and net photosynthesis decreased in plants subjected to heat stress (40 degrees C for 6 h), but proline metabolism increased. SA treatment (0.5 mM) alleviated heat stress by increasing proline production through the increase in gamma-glutamyl kinase (GK) and decrease in proline oxidase (PROX) activity, resulting in promotion of osmotic potential and water potential necessary for maintaining photosynthetic activity. Together with this, SA treatment restricted the ethylene formation in heat-stressed plants to optimal range by inhibiting activity of 1-aminocyclopropane carboxylic acid (ACC) synthase (ACS). This resulted in improved proline metabolism, N assimilation and photosynthesis. The results suggest that SA interacts with proline metabolism and ethylene formation to alleviate the adverse effects of heat stress on photosynthesis in wheat.