Race-specific interactions between wheat genotypes and Indian cultures of stem rust

Sawhney, R. N.; Goel, L. B.

doi:10.1007/bf00264522

Cited by 7 publications

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“…Nearly 70 genes for resistance to leaf rust (Lr) and stem rust (Sr) (Mclntosh, 1988a), including Lrg, Lrl9, Lr21, Lr22b, Lr24, Lr26, Lr28, Lr29, Lr32, Lr34, Sr24, Sr26, Sr30, Sr31, Sr32, SrAgi and the combination Line (Sr36 + Sr9e) that had been found effective, were assessed as seedlings under controlled conditions and as adult plants under field conditions against Indian pathotypes (Sawhney et al, 1977;Sawhney & Goel, 1981, 1983Sawhney, Goel & Mathur, 1982a, b, 1983Sawhney & Sharma, 1990). The near-isogenic Thatcher lines with Lr14b, Lr14ab and Lr30 were likely to carry novel adult plant resistance genes (Sawhney, Sharma & Sharma 1992).…”

Section: Introductionmentioning

confidence: 99%

Introgression of diverse genes for resistance to rusts into an improved wheat variety, Kalyansona

Sawhney

Sharma

1996

Genetica

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Breeding for resistance to the three rusts of wheat usually requires incorporation of genetically independent factors conferring resistance to each rust. Linked resistance genes in some alien translocation stocks permit concurrent transference of resistance for more than one rust. Alien derived resistances, however, are often reported to be associated with reduced yield and other undesirable characters. In our experience, backcross breeding when given a limited number of backcrosses (3-6) and with suitable selection procedures has resulted in lines giving yields higher or comparable to the recurrent wheat parent Kalyansona and resistance to one, two or all three rusts without any adverse effects. Some of the rust resistant derivatives also show resistance to Neovossia indica (Karnal bunt). The derivatives thus developed when used as parents in a breeding programme have produced several improved cultivars with high yields, superior grains and diversity for resistance to rust pathogens. One of the cultivars, named 'Vaishali' (DL784-3), has been officially released for cultivation in the country.

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Section: Introductionmentioning

confidence: 99%

Introgression of diverse genes for resistance to rusts into an improved wheat variety, Kalyansona

Sawhney

Sharma

1996

Genetica

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Genetics of Wheat–Rust Interaction

Sawhney

1995

Plant Breeding Reviews

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Genetic research as the valid base of strategies for breeding rust resistant wheats

Sawhney

Joshi

1996

Genetica

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It is known that few wheat cultivars maintain their resistance to rust diseases for a long period of time, particularly when crop populations become genetically more uniform. A number of genetically diverse, so far unexploited, sources of rust resistance in the natural as well as mutagenized population of wheat cultivars were identified. Several of these genes were placed in agronomically superior well-adapted backgrounds so that they could be used as pre-breeding stocks for introducing genetic diversity for resistance in a crop population. Some of these stocks when employed as parents in several cross combinations in a breeding programme have generated a number of promising cultivars with diversity for resistance.Many presently grown wheats in India, near-isogenic lines each with Lr14b, Lr14ab, Lr30 and certain international cultivars were identified as possessing diverse sources of adult plant resistance (APR) to leaf rust. Prolonged leaf rust resistance in some of the Indian cultivars was attributed to the likely presence of Lr34 either alone or in combination with other APR components. Tests of allelism carried out in certain cultivars that continue to show adequate levels of field resistance confirm the presence of Lr34, which explains the role that this gene has played in imparting durability for resistance to leaf rust. Also, Lr34 in combination with other APR components increases the levels of resistance, which suggests that combination of certain APR components should be another important strategy for breeding cultivars conferring durable and adequate levels of resistance. A new adult plant leaf rust resistance source that seems to be associated with durability in 'Arjun' has been postulated. Likewise, cultivars possessing Sr2 in combination with certain other specific genes have maintained resistance to stem rust.Further, non-specific resistances that were transferred across widely different genotypes into two of the popular Indian wheats provided easily usable materials to the national breeding programmes for imparting durable resistance to stripe rust.

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Race-specific interactions between wheat genotypes and Indian cultures of stem rust

Cited by 7 publications

References 1 publication

Introgression of diverse genes for resistance to rusts into an improved wheat variety, Kalyansona

Introgression of diverse genes for resistance to rusts into an improved wheat variety, Kalyansona

Genetics of Wheat–Rust Interaction

Genetic research as the valid base of strategies for breeding rust resistant wheats

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