Influence of arbuscular mycorrhiza on lipid peroxidation and antioxidant enzyme activity of maize plants under temperature stress |
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Authors: | Xiancan Zhu Fengbin Song Hongwen Xu |
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Institution: | (1) Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Jinlin, Changchun, 130012, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100049, China; |
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Abstract: | The influence of the arbuscular mycorrhizal (AM) fungus, Glomus etunicatum, on characteristics of growth, membrane lipid peroxidation, osmotic adjustment, and activity of antioxidant enzymes in leaves
and roots of maize (Zea mays L.) plants was studied in pot culture under temperature stress. The maize plants were placed in a sand and soil mixture under
normal temperature for 6 weeks and then exposed to five different temperature treatments (5oC, 15oC, 25oC, 35oC, and 40oC)
for 1 week. AM symbiosis decreased membrane relative permeability and malondialdehyde content in leaves and roots. The contents
of soluble sugar content and proline in roots were higher, but leaf proline content was lower in mycorrhizal than nonmycorrhizal
plants. AM colonization increased the activities of superoxide dismutase, catalase, and peroxidase in leaves and roots. The
results indicate that the AM fungus is capable of alleviating the damage caused by temperature stress on maize plants by reducing
membrane lipid peroxidation and membrane permeability and increasing the accumulation of osmotic adjustment compounds and
antioxidant enzyme activity. Consequently, arbuscular mycorrhiza formation highly enhanced the extreme temperature tolerance
of maize plant, which increased host biomass and promoted plant growth. |
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Keywords: | |
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