锌污染土壤接种丛枝菌根真菌对玉米苗期生长的影响

Influence of Arbuscular Mycorrhizal Fungi on Maize Growth in a Zinc Polluted Soil

通过三个土壤锌水平上的盆栽玉米试验,研究了丛枝菌根真菌在锌污染时对玉米苗期生长的影响。研究表明,即使在土壤锌施入量达600mg·kg-1时,菌根真菌对玉米仍有近50%的侵染率,说明菌根真菌对重金属锌具有相当的抗性。锌污染土壤中菌根共生体的建立,明显地改善了植株对磷素的吸收和运输,有助于植株在重金属污染逆境中的生长。更为重要的是,菌根植物在未增加体内锌浓度的前提下,较对照显著提高了叶和根中的锌吸收量,表明菌根植物在重金属锌污染的土壤上具有一定的生物修复作用。

Pot-test studies were done to show the responses of inoculation of maize with Glomus caledonium at different soil Zn levels. It was shown that arbuscular mycorrhizal fungus was highly Zn-tolerant. The infection rate was nearly 50%, even when soil was supplied at a dosage of 600 mg Zn·kg-1. The improved growth of mycorrhizal plants on contaminated soils was ascribed to enhanced P uptake. Zn content in leaves and roots of mycorrhizal maize increased significantly while Zn concentration was little different between mycorrhizal and non-mycorrhizal plants. It was suggested that arbuscular mycorrhizal fungi play an important role in heavy metal bioremediation.