Major and Minor Genes in Wheat for Resistance to Puccinia Striiformis and Their Responses to Temperature Changes

Abstract

The wheat varieties, 'P.I. 178383' and 'Chinese 166' (Triticum aestivum), were each found to carry an incompletely dominant major gene for resistance to a single pathogenic type of Puccinia striiformis. In addition, an undetermined number of minor genes segregated in such a way that in certain combinations they conferred moderate resistance and modified the action of the major genes. The rust readings were made on seedling plants grown in strictly controlled-environment chambers that simulated natural conditions. The action of the major genes was not affected by different temperature profiles, but the minor genes gave better resistance at a higher temperature profile than at a lower temperature profile.

Inheritance of durable adult plant resistance to stripe rust (Puccinia striiformisf.sp.tritici) in ‘Otane’ wheat (Triticum aestivum)

“…Environmental influence on the reaction of wheat to P. striiformis f. sp. tritici has been found in several studies (Lewellen et al 1967;Lewellen & Sharp 1968;Milus & Line 1986) and this probably occurred in the present study. Sharp (1965) observed that cultivars showed characteristic responses to increasing temperature profiles.…”

“…The heterozygote major gene would probably condition an MR reaction by itself, but with the modifying influence of the resistance factor it appeared to condition the IT near to an R type in the F 1 of 'Tiritea' x 'Otane'. This kind of additive and major/minor gene resistance has been reported by many workers (Lewellen et al 1967;Milus & Line 1986;Ma & Singh 1997) for resistance to stripe rust in wheat.…”

“…However, the high IT on 'Tiritea' indicates that temperatures in the field environment were suitable for stripe rust infection to occur. When the FDSs were grouped into two classes, similar to 'Otane' and different from 'Otane', the distribution of DH lines fitted a 5:3:1 trigenic ratio for R to S. When stripe rust IT is divided into R and S classes, only the major genes are recognised, and no information on important minor genes is gained (Lewellen et al 1967). Therefore, for studies on minor gene action, more resistance categories would be helpful.…”

Review Article: High-Temperature Adult-Plant Resistance, Key for Sustainable Control of Stripe Rust

“…Sharp and associates [42][43][44][45] were the first to study inheritance of stripe rust resistance that are temperature sensitive. They identified three minor genes in wheat genotype 'PI 178383' and found them under influence of temperature.…”

10.5937/ratpov51-5985 = Use of some chemical inducers to improve wheat resistance to Puccinia striiformis f. Sp. Tritici

“…To assess the effectiveness of different test inducer treatments in suppressing the disease, infection type and disease severity on the two wheat cultivars were recorded fifteen days after treatments. Infection types were assessed using a scale described by Lewellen et al (1967) as follows: 0 = no visible infection; R = resistant, necrotic area with or without small pustules; MR = moderately resistant, small pustule surrounded by necrotic area; M = intermediate resistance, pustules of variable size, some necrosis or chlorosis; MS = moderately susceptible, medium sized pustules, no necrosis but some chlorosis and S=susceptible, large pustules, no necrosis or chlorosis. At the same time, disease severity was estimated by using the modified Cobb scale (Peterson et al 1948).…”