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首页> 外文期刊>Journal of Plant Growth Regulation >Effects of Interactions Between Cadmium and Lead on Growth, Nitrogen Fixation, Phytochelatin, and Glutathione Production in Mycorrhizal Cajanus cajan (L.) Millsp.
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Effects of Interactions Between Cadmium and Lead on Growth, Nitrogen Fixation, Phytochelatin, and Glutathione Production in Mycorrhizal Cajanus cajan (L.) Millsp.

机译：镉和铅之间的相互作用对菌根Cajanus cajan（L.）Millsp生长，固氮，植物螯合素和谷胱甘肽生产的影响。

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Heavy metals (HM) are a unique class of toxicants because they cannot be broken up into nontoxic forms. Excess HM causes stunted growth, upsets mineral nutrition, and affects membrane structure and permeability. High tolerance to HM toxicity is based on reduced metal uptake or increased internal sequestration in a genotype. Arbuscular mycorrhizal (AM) fungi are important rhizospheric microorganisms that occur in metal-contaminated soils and perhaps detoxify the potential effects of metals. The aim of this work was to study the role of the AM fungus Glomus mosseae in the alleviation of cadmium (Cd) and lead (Pb) toxicities in Cajanus cajan (L.) Millsp. (pigeonpea) genotypes. The effects of interactions between Cd (25 and 50 mg/kg) and Pb (500 and 800 mg/kg) on plant dry mass, nitrogen metabolism, and production of phytochelatins (PCs) and glutathione (GSH) were monitored with and without AM fungus in genotypes Sel-85N (relatively tolerant) and Sel-141-97 (sensitive). Cd treatments were more toxic than Pb, and their combinations led to synergistic inhibitions to growth and nitrogen-fixing potential (acetylene reduction activity [ARA]) in both genotypes. However, the effects were less deleterious in Sel-85N than in Sel-141-97. Exposure to Cd and Pb significantly increased the levels of PCs in a concentration- and genotype-dependent manner, which could be directly correlated with the intensity of mycorrhizal infection (MI). Stimulation of GSH production was observed under Cd treatments, although no obvious effects on GSH levels were observed under Pb treatments. The metal contents (Cd, Pb) were higher in roots and nodules when compared with that in shoots, which was significantly reduced in the presence of AM fungi. The results indicated that PCs and GSH might function as potential biomarkers for metal toxicity, and microbial inoculations showed bioremediation potential by helping pigeonpea plants to grow in multimetal contaminated soils.
机译：重金属（HM）是一类独特的有毒物质，因为它们不能分解成无毒形式。过量的HM会导致生长发育迟缓，使矿物质营养不适，并影响膜结构和通透性。对HM毒性的高度耐受性是基于基因型中金属摄入减少或内部隔离增加。丛枝菌根（AM）真菌是重要的根际微生物，它发生在被金属污染的土壤中，并可能消除金属的潜在作用。这项工作的目的是研究AM真菌Glomus mosseae在缓解Cajanus cajan（L.）Millsp中的镉（Cd）和铅（Pb）毒性方面的作用。 （豌豆）基因型。在有和没有AM的情况下，监测了Cd（25和50 mg / kg）和Pb（500和800 mg / kg）之间的相互作用对植物干重，氮代谢以及植物螯合素（PCs）和谷胱甘肽（GSH）产生的影响。 Sel-85N（相对耐受）和Sel-141-97（敏感）基因型的真菌。镉处理的毒性比铅高，并且两种基因型的组合均导致协同抑制生长和固氮潜力（乙炔还原活性[ARA]）。但是，与Sel-141-97相比，Sel-85N的有害作用较小。镉和铅的暴露以浓度和基因型依赖的方式显着增加了PC的水平，这可能与菌根感染（MI）的强度直接相关。在镉处理下可以观察到GSH的刺激，尽管在铅处理下没有观察到对GSH的明显影响。与芽相比，根和根中的金属含量（Cd，Pb）更高，在AM真菌存在下，金属含量（Cd，Pb）明显降低。结果表明，PCs和GSH可能是潜在的金属毒性生物标志物，微生物接种通过帮助木豆植物在多金属污染的土壤中生长而具有生物修复潜力。

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