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- Title
Genetic basis of seedling-resistance to leaf rust in bread wheat ‘Thatcher’.
- Authors
Mishra, A. N.; Kaushal, K.; Shirsekar, G. S.; Yadav, S. R.; Brahma, R. N.; Pandey, H. N.
- Abstract
The bread wheat cultivar ‘Thatcher’ is documented to carry the gene Lr22b for adult-plant resistance to leaf rust. Seedling-resistance to leaf rust caused by Puccinia triticina in the bread wheat cultivar ‘Thatcher’, the background parent of the near-isogenic lines for leaf rust resistance genes in wheat, is rare and no published information could be found on its genetic basis. The F2 and F3 analysis of the cross ‘Agra Local’ (susceptible) × ‘Thatcher’ showed that an apparently incompletely dominant gene conditioned seedling-resistance in ‘Thatcher’ to the three ‘Thatcher’-avirulent Indian leaf rust pathotypes – 0R8, 0R8-1 and 0R9. Test of allelism revealed that this gene (temporarily designated LrKr1) was derived from ‘Kanred’, one of the parents of ‘Thatcher’. Absence of any susceptible F2 segregants in a ‘Thatcher’ × ‘Marquis’ cross confirmed that an additional gene (temporarily designated LrMq1) derived from ‘Marquis’, another parent of ‘Thatcher’, was effective against pathotype 0R9 alone. These two genes as well as a second gene in ‘Kanred’ (temporarily designated LrKr2), which was effective against all the three pathotypes, but has not been inherited by ‘Thatcher’, seem to be novel, undocumented leaf rust resistance genes.
- Subjects
DISEASE resistance of plants; LEAF rust of wheat; PLANT genetics; PLANT defenses; HARDINESS of plants
- Publication
Plant Breeding, 2005, Vol 124, Issue 5, p514
- ISSN
0179-9541
- Publication type
Article
- DOI
10.1111/j.1439-0523.2005.01141.x