[Enhanced Resistance of Pea Plants to Oxidative: Stress Caused by Paraquat during Colonization by Aerobic Methylobacteria].

Prikladnaia biokhimiia i mikrobiologiia Pub Date : 2016-03-01

N V Agafonova, N Y Doronina, Yu A Trotsenko

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Abstract

The influence of colonization of the pea (Pisum sativum L.) by aerobic methylobacteria of five different species (Methylophilus flavus Ship, Methylobacterium extorquens G10, Methylobacillus arboreus Iva, Methylopila musalis MUSA, Methylopila turkiensis Sidel) on plant resistance to paraquat-induced stresses has been studied. The normal conditions of pea colonization by methylobacteria were characterized by a decrease in the activity of antioxidant enzymes (superoxide dismutase, catalase, and peroxidases) and in the concentrations of endogenous H2O2, proline, and malonic dialdehyde, which is a product of lipid peroxidation and indicator of damage to plant cell membranes, and an increase in the activity of the photosynthetic apparatus (the content of chlorophylls a, b and carotenoids). In the presence of paraquat, the colonized plants had higher activities of antioxidant enzymes, stable photosynthetic indices, and a less intensive accumulation of the products of lipid peroxidation as compared to noncolonized plants. Thus, colonization by methylobacteria considerably increased the adaptive protection of pea plants to the paraquat-induced oxidative stress.

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[豌豆植物对氧化应激的抵抗力增强：需氧甲基杆菌定殖期间百草枯造成的压力]。

研究了五种不同的需氧甲基细菌（Methylophilus flavus Ship、Methylobacterium extorquens G10、Methylobacillus arboreus Iva、Methylopila musalis MUSA、Methylopila turkiensis Sidel）在豌豆（Pisum sativum L.）上的定殖对植物抵抗百草枯诱导的胁迫的影响。在甲基细菌对豌豆进行定殖的正常条件下，抗氧化酶（超氧化物歧化酶、过氧化氢酶和过氧化物酶）的活性以及内源 H2O2、脯氨酸和丙二醛（脂质过氧化的产物和植物细胞膜受损的指标）的浓度都会降低，而光合装置的活性（叶绿素 a、b 和类胡萝卜素的含量）则会增加。与未定植的植物相比，在百草枯存在的情况下，定植的植物具有更高的抗氧化酶活性、稳定的光合指数和较少的脂质过氧化产物积累。因此，甲基细菌的定殖大大增强了豌豆植物对百草枯诱导的氧化胁迫的适应性保护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Prikladnaia biokhimiia i mikrobiologiia

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