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Identification and characterization of seedling and adult plant resistance to P uccinia hordei in Chinese barley germplasm
Author(s) -
Derevnina Lida,
Singh Davinder,
Park Robert F.
Publication year - 2013
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12082
Subject(s) - seedling , biology , germplasm , rust (programming language) , genotype , cultivar , resistance (ecology) , agronomy , gene , horticulture , botany , genetics , computer science , programming language
Leaf rust of barley, caused by P uccinia hordei , occurs in all barley‐growing regions of Australia causing significant yield losses under epidemic conditions. The development and use of resistant cultivars are the most economical and environmentally sustainable method to control leaf rust which in turn relies on ongoing efforts to identify and characterize new sources of resistance. The aim of this study was to postulate known genes and/or identify new sources of resistance to P . hordei . Fifty‐two genotypes were assessed at the seedling and adult plant growth stages. On the basis of multipathotype tests, 39 genotypes lacked detectable seedling resistance, and nine were postulated to carry the genes R ph2, R ph4, R ph12 and R ph19 singly. Four genotypes carried uncharacterized seedling resistance; however, the gene(s) present in each were ineffective to at least one of the pathotypes used. Field tests at the adult plant growth stage revealed the presence of adult plant resistance ( APR ) in 12 genotypes. Tests of allelism and marker analysis indicated that resistance genes present in these genotypes were independent of the APR gene R ph20 .