关键词: 抗药性, 猪殃殃, 乙酰乳酸合成酶, 基因突变

Abstract:

【Objective】 In recent years, Galium aparine L. in most winter wheat fields in China could not be controlled by tribenuron-methyl. The objective of this study is to understand the molecular basis of the resistance mechanism to tribenuron-methyl in G. aparine and to find the specific mutation sites in amino acid sequence of acetolactate synthase (ALS) in the resistant biotype of G. aparine. 【Method】 Fragments encoding the ALS were amplified and cloned from G. aparine, susceptible (S) and resistant (R) biotypes to tribenuron-methyl, respectively, and sequenced subsequently. 【Result】 The result showed that the nucleotide sequence of R-biotype of G. aparine differed from that of the S biotype with three amino acid substitutions, of which, the amino acid substitution of Trp574 (TGG) to Gly (GGG) located in the highly conserved region Domain B. 【Conclusion】 The substitution of Trp574 might be responsible for the resistance to tribenuron-methyl in the R-biotype of G. aparine.

Key words: resistance, Galium aparine L., acetolactate synthase, gene mutation