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首页> 外文期刊>Russian Journal of Plant Physiology >Physiological responses of wheat seedlings to drought and UV-B radiation. Effect of exogenous sodium nitroprusside application
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Physiological responses of wheat seedlings to drought and UV-B radiation. Effect of exogenous sodium nitroprusside application

机译：小麦幼苗对干旱和UV-B辐射的生理响应。外源硝普钠的应用效果

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摘要

Physiological and biochemical responses of wheat seedlings to drought, UV-B radiation, and combined stress were investigated. Drought, UV-B, and combined stresses retarded seedling growth by 26.5, 29.1, and 55.9%, respectively. One reason for growth retardation may be the oxidative damage indicated by an increase in the HO content and lipid peroxidation degree. Furthermore, there was negative correlation between shoot fresh weight and HO content, fresh weight and the content of thiobarbituric acid-reacting substances (TBARS), and the positive correlation between HO content and TBARS (R po = 0.9251, 0.9005, and 0.9007, respectively). The activities of superoxide dismutase, guaiacol peroxidase, and ascorbate peroxidase increased under drought, UV-B, and the combination of stresses, while catalase activity decreased under the combined stress as compared to the control. The combination of drought and UV-B caused more severe damage to wheat seedlings than stress factors applied separately. Thus, the combined application of drought and UV-B had more strong adverse effects on wheat seedlings. The addition of 0.2 mM sodium nitroprusside (SNP) enhanced wheat seedling growth under drought, UV-B, and combined stress, likely, due to decreasing the accumulation of HO and lipid peroxidation as well as activating the antioxidant enzymes. However, SNP treatment decreased the proline content.
机译：研究了小麦幼苗对干旱，UV-B辐射和复合胁迫的生理生化响应。干旱，UV-B和联合胁迫分别使幼苗生长延迟26.5％，29.1％和55.9％。生长迟缓的原因之一可能是HO含量和脂质过氧化度增加所表明的氧化损伤。此外，枝条鲜重与HO含量，硫代巴比妥酸反应物（TBARS）的鲜重与含量之间呈负相关，HO含量与TBARS之间呈正相关（R po分别为0.9251、0.9005和0.9007）。 ）。与干旱相比，在干旱，UV-B和胁迫的联合作用下，超氧化物歧化酶，愈创木酚过氧化物酶和抗坏血酸过氧化物酶的活性增加，而在联合胁迫下，过氧化氢酶的活性下降。与单独施用的胁迫因素相比，干旱和UV-B的结合对小麦幼苗造成的破坏更为严重。因此，干旱和紫外线-B的联合施用对小麦幼苗具有更强的不利影响。添加0.2 mM硝普钠（SNP）可以增强小麦幼苗在干旱，UV-B和综合胁迫下的生长，这可能是由于减少了HO的积累和脂质过氧化以及激活了抗氧化酶。但是，SNP处理降低了脯氨酸含量。

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