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在NaCl胁迫下无论接种AM真菌与否玉米植株生物产量均减少 ,但不接种处理的减少幅度比接种处理的高 10个百分点左右 .盐胁迫下接种AM真菌的玉米根系和地上部的干重、叶片水势均高于不接种处理、叶片脯氨酸含量低于不接种处理 .在盐胁迫下真菌菌丝对玉米植株磷营养的贡献由 45 .3 %降为 42 .6% ,AM真菌对植株生长的效应反而由 3 0 .9%提高到 63 .5 % ,说明AM真菌提高玉米耐盐性的机理与改善植物的水分状况和P营养状况都有关系 .试验同时还发现无论有无盐胁迫 ,接种AM真菌的玉米植株根系累积P量与地上部累积P量之比值均高于不接种的 ,即AM真菌侵染改变了P在植物体内的分配规律 ,这一特征对提高植物耐盐性是有利的 .
Under NaCl stress, the biological yield of both AM fungi and non-corn was decreased, but the decrease of non-inoculation was about 10% higher than that of inoculation.The dry weight of corn roots and aboveground parts of inoculated AM fungi under salt stress, The leaf water potential was higher than that of non-inoculation treatment, and the content of proline in leaves was lower than that of non-inoculation treatment. The contribution of fungal mycelium to phosphorus nutrition of maize plants decreased from 45.3% to 42.6% under salt stress. But the effect of growth increased from 30.9% to 63.5%, indicating that the mechanism of AM fungi to improve salt tolerance of maize is related to the improvement of plant water status and P nutrition status.At the same time, the experiment also found that with or without salt stress , The ratio of P accumulation in root system to P accumulation in aboveground part of AM plants was higher than that in non-inoculation, that is, AM fungal infection changed the distribution rule of P in plants, It is good.