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Resistance genes and their deployment for control of leaf rust of wheat



Resistance genes and their deployment for control of leaf rust of wheat



Indian Journal of Genetics & Plant Breeding 39(2): 359-365



The high yielding dwarf wheat varieties are susceptible to leaf rust, Puccinia recondita. There is an immediate need for incorporation of resistant genes into commercial varieties. Of the 22 Lr genes, 9 genes, Lr9, Lr19, Lr15, Lr10, Lr1, Lr3 (ka), Lr17, Lr16 and Lr20 in different combinations confer total resistance to all the pathogenic races of India. The combinations are Lr10 + Lr15, Lr1 + Lr10 + Lr16, Lr1 + Lr10 + Lr17, Lr3 (ka) + Lr10 + Lr17 and Lr3 (ka) + Lr10 + Lr20. These genes can be identified by using the 5 most virulent and prevalent races, 12, 77, 104, 162 and 162A. For deployment of genes, India could be divided into 3 regions: (A) central Plains, (B) northern Himalayan and (C) southern Niligiri and Palani Hills. Stronger genes (Lr9 or Lr19 or Lr10 + Lr15) can be deployed in region A, and 3 other gene combinations (Lr1 + Lr10 + Lr16 or Lr3 ka + Lr10 + Lr17 in region B, and Lr3 ka + Lr10 + Lr20 or Lr1 + Lr10 + Lr17) in region C. When a number of genes are in operation the possibility of buildup of a super race is minimized and the pathogen stabilizes. It is suggested that a similar line of work with Sr and Yr isogenic lines will probably help in the release of stable varieties for the 3 prevalent rusts of India.

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