Response of Rice Varieties to Bound Residues of Metsulfuron-Methyl in a Paddy Soil  

作　　者：LI Zhao-Jun WANG Hai-Zhen XU Jian-Ming WU Jian-Jun MA Guo-Rui 

机构地区：[1]Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310029 （China）. [2]Institute of Agricultural Resources and Regional Planning, Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, Chinese Academy of Agricultural Sciences, Beijing 100081 （China）

出　　处：《Pedosphere》2007年第4期487-492,共6页土壤圈（英文版）

基　　金：the National Natural Science Foundation of China (No.40671092);the National Foundation for Distinguish Young Scholars of China (No.40425007);the National Basic Research Program of China (No.2005CB 121104).

摘　　要：Metsulfuron-methyl is one of the widely used sulfonylurea herbicides. However, approximately half of the applied metsulfuron-methyl may remain as bound residues in soil. To characterize the response of rice plants to residual metsulfuron-methyl in soil, the activities of acetolactate synthase （ALS）, superoxide dismutase （SOD）, peroxidase （POD）, and catalase （CAT） were investigated in two rice varieties that differed in susceptibility to the herbicide. Changes in the activity of these enzymes in leaves and roots of Xiushui 63, a sensitive rice variety, were greater than those in a resistant variety Zhenong 952. Irrespective of variety, changes in the enzyme activity were greater in the roots than in the leaves. The activities of ALS and CAT decreased, while the SOD activity increased with the increase in the amounts of bound residues of metsulfuron-methyl （BRM） in soil. The POD activity increased at the BRM level of 0.025 mg kg^-1, but decreased at the BRM level of 0.05 mg kg^-1. The results showed that the bound residues of sulfonylurea herbicides may affect metabolism of rice plants.Metsulfuron 甲基是广泛地使用的 sulfonylurea 除草剂之一。然而，近似，应用 metsulfuron 甲基的一半可以是在土壤绑了残余留下。为了描绘大米的反应，到在土壤， acetolactate synthase (ALS ) 的活动，超级氧化物 dismutase (草皮) ，过氧化物酶(邮政部门) ，和过氧化氢酶(猫) 的剩余 metsulfuron 甲基的植物在在危险性不同到除草剂的二个大米变化被调查。在在 Xiushui 63 的叶子和根的这些酶的活动的变化，一个敏感米饭变化，比在抗性品种 Zhenong 952 的那些大。不管变化，在酶活动的变化比在叶子在根是更大的。ALS 和猫的活动减少了，当 SOD 活动随土壤的 metsulfuron 甲基(BRM ) 的界限残余的数量的增加增加了时。邮政部门活动在 0.025 mg kg 的 BRM 水平增加了 ? 1，但是在 0.05 mg kg 的 BRM 水平减少了 ? 1。结果证明 sulfonylurea 除草剂的界限残余可以影响米饭植物的新陈代谢。

关 键 词：ALS activity bound residues CAT activity METSULFURON-METHYL SOD activity 

分 类 号：S153[农业科学—土壤学]