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首页> 外文期刊>Physiologia plantarum >Mycorrhizal colonization alleviates drought-induced oxidative damage and lignification in the leaves of drought-stressed perennial ryegrass (Lolium perenne)
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Mycorrhizal colonization alleviates drought-induced oxidative damage and lignification in the leaves of drought-stressed perennial ryegrass (Lolium perenne)

机译：菌根定植减轻了干旱引起的多年生黑麦草（黑麦草）叶片中干旱引起的氧化损伤和木质化。

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摘要

To investigate the effects of arbuscular mycorrhizal (AM) fungus Glomus intraradices on antioxidative activity and lignification under drought-stressed (DS) conditions, the enzyme activities, growth, lignin contents and some stress symptomatic parameters as affected by drought treatment were compared in AM colonized or non-colonized (non-AM) perennial ryegrass plants for 28 days. Drought significantly decreased leaf water potential (?w), photosynthesis rate and biomass. The negative impact of drought on these parameters was much highly relived in AM plants compared to non-AM ones. Drought increased H2O2, lipid peroxidation, phenol and lignin levels, with significantly higher in non-AM relative to AM plants at day 28 after drought treatment. The enhanced activation of guaiacol peroxidase (GPOX), coniferyl alcohol peroxidase (CPOX), syringaldazine peroxidase (SPOX) and polyphenol oxidase (PPO) was closely related with the decrease in ?w in both AM and non-AM plants. GPOX, CPOX, SPOX and PPO highly activated with a concomitant increase in lipid peroxidation and lignin as the ?w decreased below -2.11 MPa in non-AM plants, while much less activated by maintaining ?w=-1.15 MPa in AM ones. These results indicate that AM symbiosis plays an integrative role in drought stress tolerance by alleviating oxidative damage and lignification, which in turn mitigate the reduction of forage growth and digestibility under DS conditions.
机译：为了研究干旱胁迫（DS）条件下丛枝菌根真菌（AM）真菌球根内radi对抗氧化活性和木质化的影响，比较了受干旱处理的AM菌落的酶活性，生长，木质素含量和一些胁迫症状参数。或非殖民化（non-AM）多年生黑麦草植物28天。干旱显着降低了叶水势（Δw），光合作用速率和生物量。与非AM植物相比，干旱对AM植物的这些参数产生了负面影响。干旱处理后第28天，干旱导致H2O2，脂质过氧化，酚和木质素水平升高，相对于AM植物，非AM显着更高。愈创木酚过氧化物酶（GPOX），松柏醇过氧化物酶（CPOX），丁香醛嗪过氧化物酶（SPOX）和多酚氧化酶（PPO）的活化增强与AM和非AM植物中Δw的降低密切相关。在非AM植物中，当ωw降低到-2.11 MPa以下时，GPOX，CPOX，SPOX和PPO被高度激活，同时脂质过氧化和木质素的增加，而在AM植株中通过保持ωw= -1.15 MPa而被激活的程度要低得多。这些结果表明，AM共生通过减轻氧化损伤和木质化，在干旱胁迫耐受性中起着综合作用，从而减轻了DS条件下草料生长和消化率的降低。

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