Identification and characterization of seedling and adult plant resistance to Puccinia hordei in Chinese barley germplasm |
| |
Authors: | Lida Derevnina Davinder Singh Robert F Park |
| |
Institution: | Plant Breeding Institute, University of Sydney, , Narellan, NSW, 2567 Australia |
| |
Abstract: | Leaf rust of barley, caused by Puccinia 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 Rph2, Rph4, Rph12 and Rph19 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 Rph20. |
| |
Keywords: |
Hordeum vulgare
barley leaf rust adult plant resistance gene postulation gene additivity transgressive segregation minor gene |
|
|