铅（Pb）污染下丛枝菌根真菌对早稻生长的影响

目的]研究土壤重金属 Pb污染下丛枝菌根真菌（Arbuscular mycorrhizal fungi， AMF）对旱稻生长的影响。方法]采用盆栽实验的方法，研究了不同土壤 Pb 处理水平（0，300，600 mg/kg）下，接种 Glomus mosseae下旱稻（Oryzal Sativa L.）的生长效应。结果]接种处理下，旱稻根系侵染率随着土壤 Pb含量增加而显著降低（P〈0.05）。与未接种处理相比，接种处理显著提高300 mg/kg Pb处理下旱稻生物量以及地下部分 Pb含量，却显著降低了地上部分 Pb含量，这与接种处理显著降低了 R/S值的结果一致（P〈0.05）；600 mg/kg Pb处理下，接种显著提高了地下部分生物量（P〈0.05），却显著降低了旱稻地上部分以及地下部分 Pb含量（P〈0.05），接种处理与未接种处理下 R/S值差异不明显。结论]该研究表明在一定的土壤 Pb处理下接种 Glomus mosseae可以在一定程度上缓解 Pb对 Oryzal Sativa L.的毒害作用。

Effects of Arbuscular Mycorrhizal Fungi （AMF） on Growth of Upland Rice under Soil Pb Contamination

Objective] This study aimed to investigate the effects of arbuscular mycor-rhizal fungi （AMF） on growth of upland rice under soil Pb contamination. Method] Using potting method, the effects of Glomus mosseae on the growth of Oryzal sati-va L. under different soil Pb concentrations （0, 300, 600 mg/kg） were investigated. Result] According to the results, the mycorrhizal colonization rate of upland rice in-oculated with Glomus mosseae was significantly reduced （P〈0.05） with the increase of Pb concentration in soil. Compared with non-inoculation treatment, inoculation of arbuscular mycorrhizal fungi significantly improved the biomass of upland rice and Pb concentration of upland rice roots with addition of 300 mg/kg Pb but significantly reduced Pb concentration of upland rice shoots, which was consistent with the re-duced R/S （P〈0.05）; with addition of 600 mg/kg Pb, inoculation of arbuscular mycor-rhizal fungi significantly improved the biomass of upland rice roots （P〈0.05） but sig-nificantly reduced Pb concentration of upland rice shoots and roots （P〈0.05）; there was no significant difference in R/S between inoculation treatment and non-inocula-tion treatment. Conclusion] This study indicated that inoculating Glomus mosseae under certain Pb concentrations could to some extent al eviate the toxic effects of Pb on Oryzal sativa L.