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为探明丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)提高番茄幼苗抗冷性的生理机制,以中杂105为材料,研究接种AMF对低温胁迫下番茄幼苗生长和相关生理指标的影响。结果表明:低温胁迫使番茄幼苗株高、地上部和地下部干鲜质量的增长量和相对叶绿素含量减小,并导致电解质渗透率、可溶性蛋白和MDA含量增加,SOD和POD活性升高,而CAT活性呈先升高后降低的趋势;但接种AMF的幼苗在低温胁迫下较普通番茄幼苗各生长指标的增长量、叶片相对叶绿素和可溶性蛋白的含量均有增加,SOD、POD和CAT的活性亦有增加,同时电解质渗透率和MDA含量显著减少。由此可见,接种AMF能减轻低温胁迫对番茄生长的不利影响,从而增强番茄幼苗对低温胁迫的适应性。
In order to explore the physiological mechanism of arbuscular mycorrhizal fungi (AMF) improving the chilling tolerance of tomato seedlings, the effects of inoculation AMF on tomato seedling growth and its related physiological indices under low temperature stress were studied. The results showed that under low temperature stress, the increase of dry weight and the relative chlorophyll content of plant height, above-ground and underground parts of tomato seedlings decreased, and the electrolyte permeability, soluble protein and MDA content increased, SOD and POD activity increased CAT activity increased first and then decreased. However, the growth of seedlings of AMF-inoculated seedlings under low temperature stress was higher than that of common tomato seedlings, the content of relative chlorophyll and soluble protein, the activities of SOD, POD and CAT Also increased, while electrolyte permeability and MDA content decreased significantly. Thus, inoculation AMF can reduce the adverse effects of low temperature stress on tomato growth, thereby enhancing the adaptability of tomato seedlings to low temperature stress.