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Results and discussion

The following fifteen lines were constituted in BC3S4 in Unnath Kalyansona background.



So far eighteen diverse specific genes conditioning resistance to Puccinia striiformis have been reported. Based on the critical field evaluation, all the incorporated genes were proved to be resistant to stripe rust (Table 1).

In the gene complex of Sr24 + Lr24 the appearance of black rust was noticed upto 40% which could be due to the deterioration of Sr24 gene. The trace moderately resistance condition for black rust was only observed in the gene complexes of Sr26 + Lr24 and Sr27 + Lr28. Since Yr9 gene is linked with Sr31 + Lr26, the resistance to black rust was also noticed along with yellow rust. Moreover a complete resistance condition was observed for leaf and stripe rusts in all the gene complexes. The disease free Kalyansona genotypes gave significant increase in grain yield/plant and 1000 grain weight over original and Unnath Kalyansona (Table 2). These stripe rust resistance genes have been successfully transferred into the number of commercial wheat varieties under cultivation in U.K.


References

Brahma RN, Asir R and Reddy VRK (1993) Transfer of yellow rust resistance from C-306 into the Indian wheat cultivars through a bridging technique. Acta Botanica Indica 21: 156-157.

Kochumadhavan K, Tomer SMS and Nambison PNN (1988) Transfer of rust resistance genes into commercial cultivars of wheat, Annual Wheat Newsletter 34: 54-55.

Rao, MV (1978) Wheat Research in India (1966-1976) - Varietal improvement, pp. 46.

Reddy VRK, Brahma RN and Asir R (1993a) Transfer of Secale cereal derived linked rust resistance gene complex Sr31 = Lr26 + Yr9 into Indian wheat cultivars. J Indian Bot Soc 72: 1-4.

Reddy VRK, Asir R and Brahma RN (1993b) Development of rust resistance in two Indian wheat cultivars. Crop Res 6 (2): 335-336.

Singh H, Johnson R and Sethi D (1990) Genes for race specific resistance to yellow rust (Puccinia striiformis) in Indian wheat cultivars. Plant Pathology 39: 424-433.

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