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Identification and genetic characterisation of adult plant resistance to crown rust in diploid and tetraploid accessions of Avena
Author(s) -
Cabral A.L.,
Singh D.,
Park R.F.
Publication year - 2011
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.2011.00492.x
Subject(s) - biology , ploidy , avena , rust (programming language) , seedling , botany , plant disease resistance , resistance (ecology) , gene , agronomy , genetics , computer science , programming language
The identification and genetic characterisation of adult plant resistance (APR) to crown rust, caused by Puccinia coronata f. sp. avenae ( Pca ), was carried out in diploid Avena strigosa and tetraploid Avena barbata accessions from diverse geographical regions. Seven accessions were found to carry APR to Pca , six of which (CIav6956, CIav7280, CIav8089, CIav9020, PI292226, PI436082) were diploid and one (PI337865) a tetraploid. All six diploid A . strigosa accessions were postulated to carry the ‘Saia’ seedling resistance to Pca ( Pc15 , Pc16 , Pc17 ) in addition to the APR. Three of these six accessions (CIav6956, CIav9020, PI292226) were used to study both seedling resistance and APR, using two Pca pathotypes, one avirulent on seedlings and the second virulent on seedlings but avirulent on adult plants. The seedling resistance in each was shown to be inherited independently of the APR. In each case, APR was conferred by a single major dominant gene, based on hypersensitivity, coupled with low infection types. Allelism tests are required to determine if these three APR genes are different. This is the first report of APR to crown rust in A . strigosa and A. barbata .