Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Jinlin, Changchun, 130012, China.
Mycorrhiza. 2010 Jun;20(5):325-32. doi: 10.1007/s00572-009-0285-7. Epub 2009 Nov 20.
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 (5 degrees C, 15 degrees C, 25 degrees C, 35 degrees C, and 40 degrees C) 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.
丛枝菌根（AM）真菌，Glomus etunicatum，对温度胁迫下玉米（Zea mays L.）植株叶片和根系生长特性、膜脂过氧化、渗透调节和抗氧化酶活性的影响进行了研究。将玉米植株在正常温度下置于沙壤土混合物中培养 6 周，然后暴露于 5 种不同的温度处理（5℃、15℃、25℃、35℃和 40℃）1 周。AM 共生降低了叶片和根系的膜相对渗透率和丙二醛含量。根中可溶性糖含量和脯氨酸含量较高，但根中脯氨酸含量低于非共生植株。AM 定殖增加了叶片和根系中超氧化物歧化酶、过氧化氢酶和过氧化物酶的活性。结果表明，AM 真菌能够通过降低膜脂过氧化和膜通透性，增加渗透调节物质的积累和抗氧化酶活性，缓解温度胁迫对玉米植株的伤害。因此，丛枝菌根的形成极大地提高了玉米植物对极端温度的耐受性，增加了宿主生物量，促进了植物生长。
