水杨酸通过脯氨酸产生和乙烯形成的变化来缓解热应激对光合作用的不利影响。
Salicylic acid alleviates adverse effects of heat stress on photosynthesis through changes in proline production and ethylene formation.
机构信息
Department of Botany; Aligarh Muslim University; Aligarh, India.
出版信息
Plant Signal Behav. 2013 Nov;8(11):e26374. doi: 10.4161/psb.26374. Epub 2013 Sep 10.
Abstract
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 °C for 6 h), but proline metabolism increased. SA treatment (0.5 mM) alleviated heat stress by increasing proline production through the increase in γ-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.
摘要
我们研究了水杨酸（SA）在缓解小麦（Triticum aestivum L.）WH 711 品种光合作用热应激不良影响中的潜力。在热应激（40°C 下 6 小时）下，Rubisco 活性、光合-氮利用效率（NUE）和净光合作用下降，但脯氨酸代谢增加。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）活性来增加脯氨酸的产生，从而缓解热应激，导致渗透势和维持光合作用所需的水势增加。此外，SA 处理通过抑制 1-氨基环丙烷羧酸（ACC）合酶（ACS）的活性，将热胁迫下植物的乙烯形成限制在最佳范围。这导致脯氨酸代谢、氮同化和光合作用的改善。结果表明，SA 通过与脯氨酸代谢和乙烯形成相互作用来缓解热应激对小麦光合作用的不利影响。
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