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首页> 外文期刊>Acta Physiologiae Plantarum >Hydrogen peroxide pretreatment of roots enhanced oxidative stress response of tomato under cold stress
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Hydrogen peroxide pretreatment of roots enhanced oxidative stress response of tomato under cold stress

机译：根部过氧化氢预处理增强了冷胁迫下番茄的氧化应激反应

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摘要

In the view of physiological role of H2O2, we investigated whether exogenous H2O2 application would affect short-term cold response of tomato and induce acclimation. Pretreatments were performed by immersing roots into 1 mM H2O2 solution for 1 h whentransferring seedlings from seedling substrate to soil (acclimated group). Cold stress (3 °C for 16 h) caused significant reduction in relative water content (RWC) of control and non-acclimated (distilled water treated) groups when compared with unstressed plants. H2O2 promoted maintenance of relatively higher RWC under stress. Anthocyanin level in leaves of acclimated plants under cold stress was significantly higher than that of unstressed control and non-acclimated plants. Malondialdehyde (MDA) levels demonstrated low temperature induced oxidative damage to control and non-acclimated plants. MDA remained around unstressed conditions in acclimated plants, which demonstrate that H2O2 acclimation protected tissues against cold induced lipid peroxidation. H2O2 acclimation caused proline accumulation in roots under cold stress. Ascorbate peroxidase (APX) activity in roots of cold stressed and unstressed H2O2 acclimated plants increased when compared with control and non-acclimated plants, with highestincrease in roots of acclimated plants under cold stress. CAT levels in roots of acclimated plants also increased, whereas levels remained unchanged in unstressed plants. Endogenous H2O2 levels significantly increased in roots of control and non-acclimated plants under cold stress. On the other hand, H2O2 content in roots of acclimated plants was significantly lower than control and non-acclimated plants under cold stress. The results presented here demonstrated that H2O2 significantly enhanced oxidative stress response by elevating the antioxidant status of tomato.
机译：鉴于H2O2的生理作用，我们研究了外源H2O2的施用是否会影响番茄的短期冷响应并诱导驯化。将幼苗从幼苗基质转移到土壤（适应组）时，将根浸入1 mM H2O2溶液中1 h进行预处理。与非胁迫植物相比，冷胁迫（3°C，持续16 h）导致对照组和非适应（蒸馏水处理）组的相对含水量（RWC）显着降低。 H 2 O 2促进在压力下维持相对较高的RWC。冷胁迫下适应植物的花色苷水平显着高于未胁迫对照和非适应植物。丙二醛（MDA）含量表明低温诱导了对对照植物和非适应植物的氧化损伤。 MDA保持在驯化植物的无压力条件下，这表明H2O2驯化可以保护组织免受冷诱导的脂质过氧化作用。 H2O2的驯化导致脯氨酸在冷胁迫下在根中积累。与对照和非适应植物相比，冷胁迫和非胁迫H2O2适应植物的根中抗坏血酸过氧化物酶（APX）活性均增加，而冷胁迫下适应植物的根中抗坏血酸过氧化物酶的活性最高。适应植物的根中的CAT水平也增加，而未胁迫植物中的CAT水平保持不变。在冷胁迫下，对照和非适应植物的根中内源性H2O2水平显着增加。另一方面，在冷胁迫下，适应植物的根中的H 2 O 2含量明显低于对照和未适应植物的根。此处显示的结果表明，H2O2通过提高番茄的抗氧化剂状态而显着增强了氧化应激反应。

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