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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Early osmotic, antioxidant, ionic, and redox responses to salinity in leaves and roots of Indian mustard (Brassica juncea L.)
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Early osmotic, antioxidant, ionic, and redox responses to salinity in leaves and roots of Indian mustard (Brassica juncea L.)

机译：芥菜（Brassica juncea L.）的叶片和根部对盐分的早期渗透，抗氧化剂，离子和氧化还原反应

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Salt-stress-induced alterations in osmotic, ionic, and redox responses were studied in the early period of treatment (30 min to 5 days) in seedlings of Brassica juncea L. Roots and shoots under mild (50 mM) and severe (250 mM) NaCl stress were analyzed for growth, oxidative stress, osmolyte accumulation, antioxidant defense, and redox state. Growth reduction was less pronounced in the early time period of salt stress while oxidative damage increased linearly and in a sustained manner under severe stress up to 6 h. An early and transient reactive oxygen species (ROS) burst, as evidenced by superoxide and hydrogen peroxide level was observed, followed by activation of enzymatic antioxidant system (GPX, SOD, CAT, and GR) in both root and shoot. The enzymatic activity was not affected much under mild stress particularly at early phase; however, severe stress induced a significant increase in the activity of antioxidant enzymes. Root ascorbate was progressively accumulated, and its redox state maintained in the early time phase of treatment under mild stress while increase in root and shoot glutathione content was recorded under mild stress at 5 days when the active ascorbate pool decreased. While early period of salt stress showed significant Na+ accumulation over control, plants subjected to mild stress measured less Na+ accumulation up to 5 days compared to severely stressed plants. The results showed an early induction of differential responses to salt stress in roots and shoots of Brassica which include growth limitations, reduced relative water content, increased osmolytes, redox state, and antioxidant system, and a significant Na+ increase. The results also indicate that roots and shoots may have distinct mechanisms of responses to salt stress.
机译：在处理的早期阶段（30分钟至5天），研究了盐胁迫诱导的芥菜幼苗在渗透，离子和氧化还原反应中的变化。轻度（50 mM）和重度（250 mM）下的根和芽）分析了NaCl胁迫的生长，氧化胁迫，渗透液积累，抗氧化剂防御和氧化还原状态。在盐胁迫的早期，生长的减少并不明显，而在严重胁迫下长达6小时，氧化损伤以线性方式持续增加。观察到过早和短暂的活性氧（ROS）破裂，如超氧化物和过氧化氢水平所证明的，随后在根和茎中都激活了酶促抗氧化剂系统（GPX，SOD，CAT和GR）。在轻度压力下，尤其是在早期，酶的活性没有受到太大的影响。然而，严重的压力导致抗氧化酶的活性显着增加。根部抗坏血酸逐渐积累，在轻度胁迫下处理的早期阶段，其氧化还原状态得以维持，而在轻度胁迫下，当活性抗坏血酸库减少时，根和茎中谷胱甘肽的含量增加。虽然盐胁迫的早期显示出比对照明显的Na +积累，但是与重度胁迫的植物相比，遭受轻度胁迫的植物在长达5天时测得的Na +积累较少。结果表明，早期诱导的甘蓝型油菜根和芽对盐胁迫的差异响应包括生长受限，相对水含量降低，渗透压升高，氧化还原态和抗氧化系统，以及Na +的显着增加。结果还表明，根和芽可能具有不同的盐胁迫响应机制。

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