EFFECTIVE JUVENILE RESISTANCE OF SPRING SOFT WHEAT SAMPLES FROM THE VIR COLLECTION TO LEAF RUST AND DARK BROWN LEAF SPOT
DOI:
https://doi.org/10.30850/vrsn/2021/3/18-23Keywords:
spring bread wheat, VIR collection, leaf rust, dark-brown leaf spot blotch, juvenile resistance, resistance genes, sources of resistanceAbstract
The article presents the results of studying juvenile resistance to leaf rust (Puccinia triticina Erikss.) and dark-brown leaf spot blotch (Bipolaris sorokiniana (Sacc.) in 3949 samples of spring bread wheat from the World collection of the Vavilov All-Russian Institute of Plant Genetic Resources (VIR) originating from 81 countries. According to the status of the samples, the material was represented by: local varieties (landraces), breeding varieties, breeding and genetic lines. Under laboratory conditions, intact seedlings and leaf segments on water were infected with a complex population of P. triticina and a mixture of B. sorokiniana isolates. 84 samples were highly resistant to leaf rust, 60 of them originating from regions of the Russian Federation. For 52 samples, genes for resistance to leaf rust were postulated with phytopathological test, using the pathogen clones marked with virulence to effective resistance genes Lr9, 19, 24, 41 and 47: Lr9 was identified in 26 samples, Lr24 - 13, Lr19 – in 13 ones. Genes Lr41 and Lr47 were not found in the studied samples. A high level of juvenile resistance to dark-brown leaf spot blotch was revealed only in lines LT-5 and LT-6, developed in VIR on the base of somaclonal variability induction.
