To elucidate genotypic differences expressed through the grain yield of drought-stressed wheat, 21 commercial varieties and advanced lines were evaluated in the field under a range of soil water levels to induce varying degrees of drought stress. This paper presents data on grain yield and yield-based indices to indicate drought tolerance and drought susceptibility. AZS-4 was identified as drought tolerant and AZS-I7 and 'Pavon' as drought susceptible. High grain yield under stress can be explained in terms of high yield potential, thus grain yield proved to be the best indicator of drought tolerance.
Phenotypically stable wheat mutants derived from the gamma rays, ethyl methane sulphonate and combined mutagenic treatments of one locally bred cultivar (C-591) and two cultivars (Indus-66 and Nayab) of Mexican origin, were tested for yield performance in MS generation. Mutants originating from Nayab could be classified into two main categories relative to the control viz. significantly higher yielding and significantly lower yielding. Mutants of C-591 and Indus-66 gave only significantly reduced mean yields compared with their respective controls. Considerable increases in genotypic variance, heritability and genetic gain expected from selection, were observed among the mutants of the three cultivars. The importance of induced mutations for increasing genetic variability connected with useful agronomic traits is emphasised.
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