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首页> 外文期刊>World journal of agricultural sciences >Effects of exogenous nitric oxide on photosynthesis, antioxidant capacity and proline accumulation in wheat seedlings subjected to osmotic stress.
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Effects of exogenous nitric oxide on photosynthesis, antioxidant capacity and proline accumulation in wheat seedlings subjected to osmotic stress.

机译：外源一氧化氮对渗透胁迫下小麦幼苗光合作用，抗氧化能力和脯氨酸积累的影​​响。

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摘要

Nitric oxide (NO) is a active molecule involved in mediation of various biotic and abiotic stress-induced physiological responses in plants. In the present study, using SNP (sodium nitroprusside) as NO donor and cPTIO [2-(4-carboxypheny-4,4,5,5-tetramethylimidazoline-1-1-oxyl-3-oxide), potassium salt] as specific NO scavenger, we examined the ability of exogenous NO to alleviate oxidative damage, accelerate proline accumulation and enhance photosynthesis in leaves of wheat seedlings subjected to osmotic stress. Wheat seedlings were exposed to Hoagland solution containing 15% polyethylene glycol (PEG), or 15% PEG plus 0.3 mmol L-1 SNP or 15% PEG plus 0.3 mmol L-1 SNP and 0.5 mmol L-1 cPTIO for 24 h. The results showed that osmotic stress induced decrease in superoxide dismutase (SOD) and catalase (CAT) activity and overproduction of O2- in wheat leaves, which in turn caused exacerbation of lipid peroxidation and depression of photosynthesis. Application of NO donor SNP retarded decrease in SOD and CAT activity, increase in O2- production and hence inhibited lipid peroxidation. As a result, Fm/Fo, Fv/Fm, , OPS2 and Pn in leaves of wheat seedlings subjected to osmotic stress were increased. Meanwhile, proline accumulation was accelerated and higher relative water content (RWC), -w and lower leaf water loss (LWL) were maintained by the application w of SNP under osmotic stress. However, such effects of SNP were reversed by the addition of NO scavenger cPTIO. It was indicated that effects of NO on preventing wheat leaves from osmotic stress-induced damage might be specific.
机译：一氧化氮（NO）是涉及植物中各种生物和非生物胁迫诱导的生理反应的介导的活性分子。在本研究中，使用SNP（硝普钠）作为NO供体，并使用cPTIO [2-（4-羧基苯基-4,4,5,5-四甲基咪唑啉-1--1-氧-3-氧化物）钾盐]作为特异性NO清除剂，我们研究了外源NO减轻遭受渗透胁迫的小麦幼苗叶片中氧化损伤，加速脯氨酸积累和增强光合作用的能力。将小麦幼苗暴露在含有15％聚乙二醇（PEG）或15％PEG加0.3 mmol L -1 SNP或15％PEG加0.3 mmol L -1 SNP和0.5 mmol L -1 cPTIO 24小时。结果表明，渗透胁迫引起小麦叶片超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性降低，O 2 -过量生产，进而加剧了小麦叶片的氧化。脂质过氧化和光合作用降低。 NO供体SNP的施用可延缓SOD和CAT活性的下降，O 2 -产量的增加，从而抑制脂质过氧化。结果，叶片中的F m / F o ，F v / F m 、、 OPS2和Pn渗透胁迫下的小麦幼苗的数量增加。同时，通过在渗透胁迫下施用SNP，可以加速脯氨酸的积累，并维持较高的相对含水量（RWC），- w 和较低的叶片失水量（LWL）。然而，通过添加NO清除剂cPTIO可以逆转SNP的这种作用。结果表明，NO对防止小麦叶片受到渗透压诱导的伤害的作用可能是特定的。

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