Cloning of a carbendazim-resistant gene from Colletotrichum gloeosporioides of mango in South China

文献类型： 外文期刊

第一作者： Ru-Lin, Zhan

作者： Ru-Lin, Zhan;Jun-Sheng, Huang

作者机构：

关键词： Colletotrichum gloeosporioides;mango;MBC-resistant gene;allele-specific PCR;enzyme assay;detection

期刊名称：AFRICAN JOURNAL OF BIOTECHNOLOGY （ 影响因子：0.573； 五年影响因子：0.794 ）

ISSN： 1684-5315

年卷期： 2007 年 6 卷 2 期

页码：

收录情况： SCI

摘要： Mango anthracnose caused by Colletotrichum gloeosporioides is an important disease and prevalent in tropical regions of China. High carbendazim (MBC)-resistant field strains were tested and collected. The fragments of tub2 were cloned, sequenced, and alignments were carried out between MBC-resistant and wild-type strains of C. gloeosporioides. The results showed that the amino acids were altered at residues 181,198, 237 and 363. All of the mutant positions were detected by allele-specific PCR. The allele-specific fragments were amplified in MBC-resistant strains by the positive primers but not in wildtype strains. On the contrary, the allele-specific fragments were amplified in wild-type strains by the negative primers but not in MBC-resistant strains. The preliminary findings proved that the point mutation occurred at amino acid codon 198 causing a change from glutamic acid (GAG) to alanine (GCG), which is closely associated with conferring MBC-resistance in the field. An enzyme assay was employed to further test the above results. It involved an Acc restriction site (CGCG) at the positions of the amino acid residues at 197 and 198 (GACGAG -> GACGCG) in MBC-resistant strains, in which Acc digested a 329 bp fragment into 107 and 222 bp, while the fragments from wild-type strains remained undigested. Based on the above assays, all of the MBC-resistant and wild-type strains were detected successfully. It strongly suggested that the altered amino acid residue at position 198 played the leading role in conferring MBC-resistance in Mango anthracnose in south China.

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