MANGANESE TOXICITY ALLEVIATED BY MYCORRHIZAE IN SOYBEAN
MANGANESE TOXICITY ALLEVIATED BY MYCORRHIZAE IN SOYBEAN
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DOI：
10.1080/01904168909364006
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发表时间：
1989-01-01
影响因子：
2.1
通讯作者：
FRANSON, RL
中科院分区：
文献类型：
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作者：
BETHLENFALVAY, GJ;FRANSON, RL
大豆（Glycine max（L.）梅尔）用日本慢生根瘤菌Nitragin菌株61 A118接种的植物在有或没有泡囊-丛枝菌根（VAM）真菌Glomusmosseae（Nicol. Gerd.）GERD.和Trappe在有效Mn高（40.4 μ g/g）的土壤中的盆栽培养中。非VAM植物的叶显示Mn毒性的严重症状，并且在叶中具有毒性（314 μ g/g）浓度的Mn。非VAM植物的干重和根瘤质量显着低于VAM植物。锰浓度的VAM植物，并没有锰中毒的症状。VAM和nonVAM植株地上部干重与叶片锰浓度呈显著负相关。由于锰的水平随着VAM真菌定植的增加而增加，我们得出结论，这不是VAM条件本身减轻锰的毒性。我们认为，非VAM植物的叶片（P < 0.05）和根系（P < 0.001）中Mn的显著较高水平是由于非VAM植物对Mn的吸收增加。这种渗出，这通常是在nonVAM植物中观察到的，以及这种渗出物在溶解MnO 2和螯合所产生的Mn 2+以促进吸收中的作用。
Soybean (Glycine max (L.) Merr.) plants nodulated with Bradyrhizobium japonicum, Nitragin strain 61A118, were grown with or without the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus mosseae (Nicol. Gerd.) Gerd. and Trappe in pot cultures in soil high (40.4 .mu.g/g) in available Mn. Leaves of the nonVAM plants showed severe symptoms of Mn toxicity and had toxic (314 .mu.g/g) concentrations of Mn in the foliage. NonVAM plants had significantly lower dry weights and nodule mass than VAM plants. Concentrations of Mn in the VAM plants, and there were no symptoms of Mn toxicity. Both VAM and nonVAM plants had a significant negative correlation between shoot dry mass and leaf Mn concentration. Since levels of Mn increased with increasing VAM-fungal colonization, we conclude that it was not the VAM condition per se which alleviated Mn toxicity. We suggest that the significantly higher levels of Mn in the leaves (P < 0.05) and the roots (P < 0.001) of nonVAM plants was due to increased uptake of Mn by the nonVAM plants. This exudation, which are generally observed in nonVAM plants, and to the role of such exudates in solubilizing MnO2 and chelating the resulting Mn2+ for facilitated absorption.