A study of factors influencing the genetics of reaction of barley to root rot caused by Helminthosporium sativum

Abstract

1969. A study of factors influencing the genetics of reaction of barley to root rot caused by Helminthosporium snrivu177. Can. J. Botany, 47: 4 2 9 4 3 . The inheritance of seedling reaction to root rot, caused by the 514 isolate of Helrninthospori~ct~ sntiv~tn~, was studied in crosses and backcrosses among the barley varieties CI.8969 and CI.8873, which show resistance, and the variety Olli, which is susceptible. The study was carried out under a controlled environment in growth cabinets. The data from reaction tests of F3 and backcross families were analyzed by Elston's procedure for testing a one-locus hypothesis, and by Powers' partitioning method. Polygenic inheritance for seedling reaction was indicated, but subsequent experiments showed that seed weight strongly influenced the reaction, which could account for the polygenic interpretation. Based on a drastic reduction of resistance in greenhouse-produced seed, irrespective of seed weight, a high positive correlation of seed weight with resistance in field-produced seed, and other evidence of a similar nature, it was assumed that resistance was related to a principle, present in the seed or on the seed surface, the quantity of which was influenced by seed size and modified by environment. Whether there was a genotypic influence on the quantity of the resistance principle, aside from that affecting seed weight, was not established conclusively. A field study involving the same materials, made in an area known to produce natural root-rot infection, showed that no correlation existed between the disease indices of the entries in the seedling stage in the growth-cabinet tests, and their reaction to the disease in the field. CI.8873 showed field resistance, whereas CI.8969 did not.

Heritability of common root rot and spot blotch resistance in barley

“…Distributions of mean common root rot reactions of progeny lines indicated that simple gene ratios were not present. Quantitative inheritance of common root rot reaction is in agreement with the conclusions of Cohen et al (1969), who obtained similar results in barley. In wheat, Sallans and Tinline (1965) suggested reaction to common root rot was a heritable trait based on consistent reactions among highly resistant and highly susceptible progeny lines of crosses at four or five locations over two years.…”

“…Common root rot resistance has been attributed to many genes and quantitative inheritance (Cohen et al 1969). However, one report suggested resistance was conditioned by two dominant genes (Loiselle 1965).…”

Inheritance and identification of molecular markers associated with spot blotch (Cochliobolus sativus L.) resistance through microsatellites analysis in barley

“…The distributions of RILs (F 6 and F 6-7 ) for spot blotch AUDPC also suggested polygenic control. Some of the previous studies concerning inheritance of resistance to spot blotch disease of barley also indicated the control by many genes (Griffee 1925;Cohen et al, 1969;Kutcher et al, 1994). However, the quantitative nature of resistance to spot blotch has not been reported in Indian barley cultivars and lines.…”

“…Reports on inheritance of spot blotch resistance using South Asian barley lines is completely lacking. Barley lines with higher levels of resistance are difficult to achieve owing to the influence of environment on disease development (Wilcoxson et al, 1990;Bailey and Wolf, 1994) and the quantitative nature of resistance (Cohen et al, 1969;Kutcher et al, 1994). A clear information regarding inheritance of spot blotch resistance is needed to design suitable strategies to enhance resistance of barley cultivars.…”