| Cultivar 'Gatcher' with Lr27 was observed to be ineffective to
some of the prevalent races/biotypes of leaf rust (77A, 162, and 162A) in
the country. The cultivar was, however, observed to produce a low level
of infection to leaf rust in field tests (SAWHNEY et al. 1982a).
This behaviour of 'Gatcher' for its resistance to leaf rust requires more
detailed study. Two stocks, CS 2A/2M 4/2 and CS 7D/Ag # 11, with Lr28 and Lr29 respectively were also found to be completely effective in seedling. Both of these genes were derived from Aegilops speltoides and present in these stocks in the background of Chinese Spring. In field tests, the low co-efficient of infection observed at different locations in the country further showed that both the stocks are also effective to leaf rust in adult plant. Cultivar 'Terensio' with Lr30 was observed to produce compatible but low reactions against most of the races/biotypes tested in seedling. The line was also observed to produce moderate co-efficient of infection in field condition at adult plant stage. This gene appears to have relatively low value in breeding resistant cultivars in the country. The identification of a number of potentially useful genes resistant to leaf rust and associated resistance to both leaf and stem rust reported in the present study should be of immense use in breeding rust resistant cultivars in the country. Acknowledgement We thank Dr R.A. MCINTOSH, University of Sydney for the supply of seed material and Dr S. NAGARAJAN, IARI Regional Station, Simla for the Supply of initial inoculum of the rust pathogne. References MCINTOSH, R.A. 1976. Genetics of wheat rusts since Farrer. Ferrer Memonal Oration 1976 The Journal of the Australian Institute of Agricultural Sicence Dec., 1976: 203-216 SAWHNEY, R.N., S.K. NAYAR, S.D. SINGH & V.L. CHOPRA 1977. Virulence pattern of the indian leaf rust races on lines and varieties of wheat with known Lr genes. SABRAO Journal 9 (1): 13-20 SAWHNEY, R.N. & L.B. GOEL 1981. Race-specific interactions between wheat genotypes and indian cultures of stem rust. Theor. Appl. Genet. 60: 161-166 SAWHNEY, R.N., L.B. GOEL & H.C. MATHUR 1982a. Adult plant responses of specific genes resistant to leaf rust against indian population of leaf rust pathogen. Z. Pflangensuchtung 89: 222-228. SAWHNEY, R.N., L.B. GOEL & H.C. MATHUR 1982b. Adult plant responses of specific genes resistant to stem rust against Indian population of stem rust pathogen. SABRAO Journal (In press) |
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