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首页> 外文期刊>Russian Journal of Plant Physiology >Accumulation of hydrogen peroxide and functioning of defense system in overwatered barley seedlings.
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Accumulation of hydrogen peroxide and functioning of defense system in overwatered barley seedlings.

机译：大麦幼苗中过氧化氢的积累和防御系统的功能。

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The effects of overwatering (flooding) on the oxidative potential, the level of low-molecular-weight antioxidants, the content of stress proteins, and activities of antioxidant enzymes in green barley (Hordeum vulgare L.) seedlings were studied. Overwatering retarded barley seedling growth and induced hydrogen peroxide accumulation, a decrease in the total ascorbate content and an increase in the content of reduced glutathione (GSH), but it did not affect the content of oxidized glutathione (GSSG). After the cessation of stress factor action (post-stress period), the content of hydrogen peroxide declined to the initial level, the content of ascorbate reduced still stronger, whereas the content of GSH continued to rise. Under flooding conditions, activities of glutathione reductase (GR) and superoxide dismutase (SOD) increased. After the cessation of stress factor action, activities of these enzymes decreased but remained at rather high levels as compared with control. Activity of catalase (CAT) reduced during stress, whereas activity of ascorbate peroxidase (APX) was not essentially changed. In the post-stress period, CAT activity remained to be low; in contrast, APX activity increased. Barley seedling flooding induced the synthesis of stress proteins, HSP70 and dehydrins (DH). In the post-stress period, the content of stress proteins decreased; however, the content of DH in experimental leaves remained rather high. The results obtained indicate that barley defense system manifested a complex response to overwatering, which may be related to the oxygen shortage under stress conditions and sharp metabolism activation at re-aeration in the post-stress period.Notes Translated from Fiziologiya Rastenii (2012) 59 (6), 746-755 (Ru).
机译：研究了淹水（淹水）对绿色大麦（Hordeum vulgare L.）幼苗氧化电位，低分子量抗氧化剂含量，胁迫蛋白含量和抗氧化酶活性的影响。过量浇水会抑制大麦幼苗的生长并导致过氧化氢的积累，总抗坏血酸含量的减少和还原型谷胱甘肽（GSH）含量的增加，但不会影响氧化型谷胱甘肽（GSSG）的含量。应力因子作用停止后（后应力期），过氧化氢的含量下降到初始水平，抗坏血酸的含量下降更强，而谷胱甘肽的含量继续上升。在淹水条件下，谷胱甘肽还原酶（GR）和超氧化物歧化酶（SOD）的活性增加。在停止应激因子作用后，这些酶的活性降低，但与对照相比仍保持在较高水平。过氧化氢酶（CAT）的活性在胁迫过程中降低，而抗坏血酸过氧化物酶（APX）的活性基本没有改变。在压力后时期，CAT的活性仍然很低。相反，APX活性增加。大麦幼苗泛滥诱导了胁迫蛋白，HSP70和脱水素（DH）的合成。在胁迫后时期，应激蛋白的含量下降。然而，实验叶片中DH的含量仍然很高。获得的结果表明，大麦防御系统对水淹表现出复杂的反应，这可能与胁迫条件下的氧气短缺以及胁迫后时期重新充气时急剧的新陈代谢活化有关.Notes from Fiziologiya Rastenii（2012）59 （6），746-755（Ru）。

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