Indian Society of Genetics & Plant Breeding

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IDENTIFICATION OF GENES FOR RESISTANCE TO STEM RUST AND THEIR DIVERSITY IN EIGHT BREADWHEAT VARIETIES. I. CROSSES WITH SUSCEPTIBLE PARENTS AND Sr LINES

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A set of eight sources of stem rust resistance, viz., HD 2009, HD 2177, HD 2189, WH 169,
HW 142, TzPP, Marco Juarez Inta, and Pi 62-Gb% XTzPP x Knott#2 (E 8643), were crossed to
two susceptible parents and Sr lines. Tests in the seedling stage were carried out with races
40 and 295 of stem rust. The F% and F3 investigations indicated the presence of 2-3 genes in
different sources. These were dominant, recessive or complementary in nature.
Modification ofgene action from complementary to dominant duplicate factors in different
genetic backgrounds was observed. The genes Sr6, Srll and Sr26 against race 40 were
detected in some sources. There were indications of the presence of gene Srge against race
295. F3 analysis indicated different genes for the two races, except Sr26 present in E 8643
causes resistance against both the races.
 

Keywords: Wheat, rust resistance, race-specific genes.

Info

Year: 1995
Volume: 55
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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