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Assessment of genetic effects of some physiological parameters in spring wheat under water stress

Salman Saleem, Muhammad Kashif, Muhammad Yasin Ashraf and Usman Saleem

Wheat is one of the most important cereal crops worldwide and drought stress is the major abiotic stress causing decrease in yield. This study was designed to unravel the genetic nature of those physiological parameters which confer drought tolerance in wheat but are mostly ignored by the plant breeders. Contrasting wheat lines for yield under drought were crossed to develop subsequent generation F1, F2, BC1 and BC2 to study the inheritance patterns. Fixable additive gene action was observed for proline, chlorophyll and total soluble proteins under drought stress which provided the opportunity for the use of these traits in breeding program focused on drought tolerance. In this study, novel work was done to unfold the genetic nature of total soluble sugars and total soluble proteins. Due to epistatic effects complex gene action was observed for grain filling period and grain yield per plant. The information generated from this study could be used as guidelines to chalk out a breeding plan against drought tolerance.

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