The tomato Orion locus comprises a unique class of Hcr9 genes

被引：23

作者：

de Kock, MJD

Brandwagt, BF

Bonnema, G

de Wit, PJGM

Lindhout, P

机构：

[1] Univ Wageningen & Res Ctr, Grad Sch Expt Plant Sci, Lab Plant Breeding, NL-6700 AJ Wageningen, Netherlands

[2] Univ Wageningen & Res Ctr, Phytopathol Lab, Grad Sch Expt Plant Sci, NL-6700 EE Wageningen, Netherlands

来源：

MOLECULAR BREEDING | 2005年 / 15卷 / 04期

关键词：

Cladosporium fulvum; contig; fingerprinting; Hcr9; Lycopersicon; resistance;

D O I：

10.1007/s11032-005-0386-8

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Resistance against the tomato fungal pathogen Cladosporium fulvum is often conferred by Hcr9 genes (Homologues of the C. fulvum resistance gene Cf-9) that are located in the Milky Way cluster on the short arm of chromosome 1. These Hcr9 genes mediate recognition of fungal avirulence gene products. In contrast, the resistance gene Cf-Ecp2 mediates recognition of the virulence factor Ecp2 and is located in the Orion (OR) cluster on the short arm of chromosome 1. Here, we report the map- and homology-based cloning of the OR Hcr9 cluster. A method was optimised to generate clone-specific fingerprint data that were subsequently used in the efficient calculation of genomic DNA contigs. Three Hcr9s were identified as candidate Cf-Ecp2 genes. By PCR-based cloning using specific OR sequences, orthologous Hcr9 genes were identified from different Lycopersicon species and haplotypes. The OR Hcr9s are very homologous. However, based on the relative low sequence homology to other Hcr9s, the OR Hcr9s are classified as a new subgroup.

引用

页码：409 / 422

页数：14

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