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The disease severity on HD
2329 and Sonalika was 40MR and 50S, respectively. The disease
severity on hexaploid derivative D 525-2 was 10 MR and on D 3542-6 it
was 5 MR. Tetraploid donors CPAN 6051 and CPAN 6073 were completely
free from leaf rust. The adult plant resistance gene Lr13
detected from D 525-2 is not effective against race 77A used here
for field tests (Gupta et al 1984). Gene Lr23 present in the
donor parent CPAN 6051 gives adult plant resistance against race 77A
(Saini et al 1986). The resistance of this derivative under field
conditions, therefore, appears to be due to Lr23 or some other
unknown leaf rust resistance gene. Some disease (5 MR) which appeared
on D 3542-6 may be due to incomplete expression of the durum
resistance from CPAN 6073. The D genome is reported to affect
expression of leaf rust resistance genes present on A or B genome
(The and Baker 1975; Kerber 1983; Dyck 1987). Since there is only
partial change is the resistance of CPAN 6051 and CPAN 6073 in
hexaploid background, it appears that the hexaploid derivatives D
525-2 and D 3542-6 can be used for the improvement of commonly grown
hexaploid wheats like HD 2329 and Sonalika.
References
Dyck PL (1987) The association of a gene for leaf rust resistance
with the chromosome 7D suppressor of stem rust resistance in common
wheat. Genome 29: 467-469.
Gupta AK, Saini RG, Malhotra S and Gupta S (1984) Genetic analysis of
two wheat cuItivars Sonalika and WL711 for reaction to leaf
rust (Puccinia
recondita). Theor
Appl Genet 67: 215-218.
Kerber ER (1983) Suppression of rust resistance in amphiploids of
Triticum.
Proc 6th Int Wheat Genet
Symp (Kyoto) 813-817.
McIntosh RA, Ling NH and Baker EP (1967) Genetic and cytogenetic
studies of stem rust, leaf rust and powdery mildew resistance in Hope
and related wheat Cultivars. Aust J Bicl Sci 20: 1181-1192.
McIntosh RA and Dyck PL (1975) Cytogenetical studies in wheat VIII.
Aust J Biol Sci 28: 201-211.
Pasquini M, Gras MA and Zitelli G (1979) Virulence genes present in
populations of Puccinia
recondita f. sp.
tritici
and
Puccinia graminis
f. sp.
tritici
in Italy during 1977
and 1979. Cereal Rust Bull 7: 8-15.
Peterson RF, Compbell AB and Hannah AE (1948) A diagramatic scale for
estimating rust intensity of leaves and stems of cereals. Can J Res
26: 496-500.
Saini RG, Gupta AK and Anand D (1986) Expression of some leaf rust
resistance genes at different growth stages in wheat against race
77A. Curr Sci 55: 802-804.
Saini RG (1987) Genetics and breeding for rust resistance in wheat.
Project Report ACIAR funded project # 8337, University of Sydney,
Australia.
Sharma DL, Saini RG, Gupta AK and Gupta S (1986) Diversity for
resistance to rust in Triticum
durum Cereal
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Staknian EC, Stewart DM and Loegering WQ (1962) Identification of
physiologic races of Puccinia
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Minn Agric Expt Stn
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The TT and Baker EP (1975) Basic studies relating to the transference
of genetic characters from T. monococcum
L. to hexaploid
wheat. Aust J Bio Sci 28: 189-199.
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