[Effects of arbuscular mycorrhizal fungi on the toxicity of chlorothalonil on upland rice (Oryzal sativa L.)].

ABSTRACT

Upland rice was selected as a host plant in a greenhouse-pot-culture experiment to investigate the effects of chlorothalonil and arbuscular mycorrhizal fungi (AMF) on the growth and oxidative damage under chlorothalonil stress. The plants were grown with three concentrations of chlorothalonil (0, 50 and 100 mg x kg(-1) soil). The results suggested that chlorothalonil inhibited the growth of upland rice and reduced dry weight of upland rice shoot from 2.5 g x pot(-1) to 1.0 g x pot(-1), and the root dry weight was reduced from 0.9 g x pot(-1) to 0.3 g x pot(-1). However, with AMF colonization the dry weight of upland rice was increased to 2.1 g x pot(-1). With 50 mg x kg(-1) chlorothalonil addition, the P uptake was reduced from 3200 microg x pot(-1) to 860 microg x pot(-1), but the AMF colonization could increased the P uptake to 1900 microg x pot(-1). Chlorothalonil induced oxidative stress indicating by the changes in activities of antioxidative enzyme and AMF colonization could alleviate the oxidative stress. These results showed that chlorothalonil induced oxidative stress and inhibited P uptake in upland rice and AMF could decrease the side effects of chlorothalonil by increasing P uptake and decreasing oxidative damages.