National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The spread of stem rust race Ug99 and variants are threat to worldwide wheat production and efforts are being made to identify and incorporate resistance. A primary source of concern at present is that Ug99 (TTKSK and its variants TTKST and TTTSK) has overcome major sources of stem rust resistance genes e.g. Sr31, Sr38 and other important gene complexes which confer resistance to stem rust. Deployment of cultivars with broad spectrum rust resistance is the only environmentally viable option to combat these diseases. Therefore, identification, mapping and deployment of effective resistance genes are critical components of global efforts to mitigate this threat. Identification and introgression of novel sources of resistance is a continuous process to combat the ever evolving pathogens. Few stem rust resistance (Sr) genes derived from the primary and secondary gene pool of wheat confer resistance to TTKSK and its variants. Breeding resistant cultivars is the most realistic approach to protect wheat from stem rust. Deployment of combinations of effective genes “stacked” or “pyramided” in combination with APR genes should improve the durability of resistance in commercial cultivars by reducing the probability of corresponding simultaneous mutation events in the pathogen. Gene pyramiding is facilitated by the ability to use molecular markers closely or completely linked to resistance genes. Though Ug99 type of races have posed a threat to the wheat cultivation worldwide, several developing countries of South and West Asia have taken proactive steps to meet this challenge.
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