Chromosomal location of specific and nonspecific components of polygenic resistance to brown rust in common wheat

Chromosomal location of specific and nonspecific components of polygenic resistance to brown rust... The genetic nature of polygenic resistance of common wheat to a causative agent of brown rust was studied. It was established, using ditelosomic lines (DT) of the cultivar Chinese Spring, that the majority of examined chromosome arms participate in differential interactions with the pathogen during formation of basic traits of polygenic resistance: the number of pustules (NP) per 1 cm2 of leaf area, the mean spore formation ability of pustule (MSFAP), the mean spore formation ability of fungus per unit of leaf area (MSFAULA). When parameters of spore formation were estimated in the pathogen, it was detected that DT lines 2BL and 5DL did not differentially interact with fungal genotypes carrying different virulence genes. Consequently, minor genes located on 2BS and 5DS arms carry a specific component of polygenic resistance. In this model experiment, we confirmed for the first time the hypothesis that polygenic (horizontal) resistance involves two components: a specific component, which is overcome by the pathogen, and a nonspecific component mediating the prolonged resistance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Chromosomal location of specific and nonspecific components of polygenic resistance to brown rust in common wheat

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Publisher
Springer Journals
Copyright
Copyright © 2010 by Pleiades Publishing, Ltd.
Subject
Biomedicine; Microbial Genetics and Genomics; Animal Genetics and Genomics; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1134/S1022795410040046
Publisher site
See Article on Publisher Site

Abstract

The genetic nature of polygenic resistance of common wheat to a causative agent of brown rust was studied. It was established, using ditelosomic lines (DT) of the cultivar Chinese Spring, that the majority of examined chromosome arms participate in differential interactions with the pathogen during formation of basic traits of polygenic resistance: the number of pustules (NP) per 1 cm2 of leaf area, the mean spore formation ability of pustule (MSFAP), the mean spore formation ability of fungus per unit of leaf area (MSFAULA). When parameters of spore formation were estimated in the pathogen, it was detected that DT lines 2BL and 5DL did not differentially interact with fungal genotypes carrying different virulence genes. Consequently, minor genes located on 2BS and 5DS arms carry a specific component of polygenic resistance. In this model experiment, we confirmed for the first time the hypothesis that polygenic (horizontal) resistance involves two components: a specific component, which is overcome by the pathogen, and a nonspecific component mediating the prolonged resistance.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Apr 25, 2010

References

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