We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
A leaf rust resistance gene, different from Lr34, associated with leaf tip necrosis in wheat.
- Authors
Mishra, A. N.; Kaushal, K.; Yadav, S. R.; Shirsekar, G. S.; Pandey, H. N.
- Abstract
The gene Lr34 has contributed to durable resistance to leaf rust caused by Puccinia triticina in wheat worldwide. The closely associated leaf tip necrosis is generally used as the gene's marker. Lr34 has been postulated in many Indian bread wheat cultivars including ‘C 306’, based on the associated leaf tip necrosis and a few other field and glasshouse observations. The present study showed monogenic control of adult-plant resistance in ‘C 306’ to leaf rust pathotype 77-5 (121R63-1). The F2 segregation in the crosses between ‘C 306’ and the two known carriers of Lr34, ‘Line 897’ and ‘Jupateco 73’‘R’ fitted a digenic ratio. The F3 families derived from the susceptible F2 segregants were true breeding for susceptibility, proving the absence of Lr34 in ‘C 306’. The cross between ‘Line 897’ and ‘Jupateco 73’‘R’ did not segregate for susceptibility. Resistance in the cross ‘Agra Local’ (susceptible) × ‘C 306’ was associated with leaf tip necrosis, showing that the leaf rust resistance gene in ‘C 306’ was associated with leaf tip necrosis, but was different from Lr34. This gene is being temporarily designated as Lr‘C 306’. Hence, leaf tip necrosis cannot be considered as an exclusive marker for selecting Lr34 in wheat improvement.
- Subjects
PLANT genetics; LEAF rust of wheat; DISEASE resistance of plants; PLANT defenses; HARDINESS of plants
- Publication
Plant Breeding, 2005, Vol 124, Issue 5, p517
- ISSN
0179-9541
- Publication type
Article
- DOI
10.1111/j.1439-0523.2005.01140.x