Genes determining pathogenicity to pea are clustered on a supernumerary chromosome in the fungal plant pathogen Nectria haematococca

被引:146
作者
Han, YN
Liu, XG
Benny, U
Kistler, HC
VanEtten, HD
机构
[1] Univ Florida, Dept Plant Pathol, Grad Program Plant Mol & Cellular Biol, Gainesville, FL 32611 USA
[2] Univ Arizona, Dept Plant Pathol, Tucson, AZ 85721 USA
关键词
Pisum sativum; Fusarium solani; pathogenicity island;
D O I
10.1046/j.1365-313x.2001.00969.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Three genes that contribute to the ability of the fungus Nectria haematococca to cause disease on pea plants have been identified. These pea pathogenicity (PEP) genes are within 25 kb of each other and are located on a supernumerary chromosome. Altogether, the PEP gene cluster contains six transcriptional units that are expressed during infection of pea tissue. The biochemical function of only one of the genes is known with certainty. This gene, PDA1, encodes a specific cytochrome P450 that confers resistance to pisatin, an antibiotic produced by pea plants. The three new PEP genes, in addition to PDA1, can independently increase the ability of the fungus to cause lesions on pea when added to an isolate lacking the supernumerary chromosome. Based on predicted amino acid sequences, functions for two of these three genes are hypothesized. The deduced amino acid sequence of another transcribed portion of the PEP cluster, as well as four other open reading frames in the cluster, have a high degree of similarity to known fungal transposases. Several of the features of the PEP cluster - a cluster of pathogenicity genes, the presence of transposable elements, and differences in codon usage and GC content from other portions of the genome - are shared by pathogenicity islands in pathogenic bacteria of plants and animals.
引用
收藏
页码:305 / 314
页数:10
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