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在盆栽条件下研究了不同施磷水平 (2 5 ,5 0 ,10 0 ,15 0mg/kg) ,不同盐水平 (NaCl0 ,1.2 g/kg)和不同接种AM真菌处理 (接种和不接种 )对玉米生长的影响。结果表明 ,施磷量为 5 0mg/kg时基本满足玉米生长的需要。1.2 g/kgNaCl胁迫显著抑制了玉米的生长 ;施磷明显促进玉米在盐胁迫条件下的生长。施磷水平和接种菌根真菌的交互作用对玉米耐盐性具有显著影响 :盐胁迫条件下 ,接种AM真菌在低磷 (2 5mg/kg)条件下对玉米生长和吸收磷有显著促进作用 ,在高磷 (10 0和 15 0mg/kg)条件下 ,对玉米生长的影响则不显著 ;施磷量为 5 0mg/kg时 ,接种AM真菌的玉米植株含磷量与不接种处理的相当 ,但接种处理的玉米植株干重却显著高于不接种处理的。可以认为 ,AM真菌提高植物耐盐性的机理不是唯一的 ,当植物对磷的需求得到满足时 ,AM真菌还可以通过其他途径使植物的耐盐性得到一定程度的提高 ,但改善植物磷营养状况是AM真菌提高植物耐盐性的主导机理
Different phosphorus levels (25, 50, 100, 150 mg / kg), different salt levels (NaCl0, 1.2 g / kg) and AM fungal inoculation (inoculation and non-inoculation) Effect of corn growth. The results showed that the requirement of corn growth was basically satisfied when the phosphorus application rate was 50 mg / kg. Under 1.2 g / kg NaCl stress, the growth of maize was significantly inhibited; phosphorus application significantly promoted the growth of maize under salt stress. The interaction of phosphorus application with inoculated mycorrhizal fungi had a significant effect on the salt tolerance of maize. Under salt stress, the AM fungi inoculated significantly promoted the growth and uptake of maize under low phosphorus (25 mg / kg) Under the condition of high phosphorus (10 0 and 150 mg / kg), the effect on maize growth was insignificant. When the amount of phosphorus was 50 mg / kg, the phosphorus content of maize plants inoculated with AM fungi was equivalent to that of non-inoculation, However, the dry weight of inoculated maize plants was significantly higher than that of non-inoculated ones. Arbuscular mycorrhizal fungi (AMF) can enhance the salt tolerance of plants. When the demand of phosphorus in plants is satisfied, AM fungi can improve salt tolerance of plants to some extent by other means, but improve plant phosphorus nutrition The condition is the dominant mechanism by which AM fungi improve plant salt tolerance