Abstract
Epidemics of leaf, stripe and stem rusts on wheat have induced significant losses in the past during the early nineteenth century and have destroying role in reducing product yield bringing about socio-economic variability worldwide. The old tall varieties with qualitative resistance couldn't continue for longer period because of the advancement of new virulent pathogen races. But varieties like Yaqui-50, Lyalpur-73, and Lerma Rojo-64 were released during early period of green revolution, still linked with durable resistance to stripe, leaf and stem rust. Advancement of new rust races like virulence's Yr27 and Yr9 followed by the appearance of Ug99 and its mutants lead the breeders to review their breeding plan. Breeders are presently relying upon to gather minor genes and their use in grouping with major genes to develop rust resistance in wheat varieties. The minor genes, Lr46/Yr29, Lr34/Yr18, Sr2/Yr30, are being broken in wheat breeding at CIMMYT and different region. The germplasm with this kind of resistance have shown existence stability over space and time. At Ayub Agriculture Research Institute, Faisalabad the home of green revolution in Pakistan, this approach has been established since1994-95. The durable resistance assortments were crossed in a top cross/back cross technique and the segregating populations were improved by adopting mass strategy, which brought about the advancement of material having preferred yield and rust resistance over the pre-exiting assortments (e.g., Inqlab-91, MH-97). Five varieties, Shafaq-06, Lasani-08, AARI-11, Millat-11 and Galaxy-13 from these crosses have been approved for general cultivation. Essentially, the material developed and circulated by CIMMYT, Mexico having this sort of resistance is being worldwide adopted. The simple sequence repeat markers (SSR) for above mentioned durable genes are accessible and can be used in early selection of superior varieties.
Highlights
Wheat (Triticum aestivum L.) is the world’s widely cultivated cereal crop along with maize and rice
The continuously varying nature of wheat stripe, leaf and stem rust pathogen have a major risk for prospect world wheat production
Learning from epidemic and losses due to emergence of rust races the researcher planned the approach of pyramiding durable resistance genes
Summary
Wheat (Triticum aestivum L.) is the world’s widely cultivated cereal crop along with maize and rice. The main objectives of this study were to (1) access durable resistance against stripe, leaf and stem rust in selected wheat varieties through breeding strategies and (2) discuss a prospect of latent material maker strategy in wheat breeding. It was observed a durable resistance against stripe rust by Johnson 22 and such type of response was observed by Anderson [43]. During early decade of green revolution varieties released including Yr18 are given in Table (3) It has been reported in a number of cultivars e.g. Barani-83, PBW-12, WL-2265, Seri-82 (Yr9, Yr2, Yr7), Pavon-76 (Yr29, Yr7, Yr6), Pak-81 (YR9, Yr7) (Badebo et al 1990). Pavon and Veery with Yr7 gene had been released in various republics individually with various names which demonstrate the extensive use of Yr7genes
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