Genetic analysis for salt tolerance in wheat (Triticum aestivum L.) cultivars.

摘要

The genetic basis of variation for salinity tolerance in bread wheat (Triticum aestivum L.) was studied using a complete diallel cross among two tolerant; two moderately tolerant; and two susceptible cultivars. Greenhouse experiments were conductedin sand cultures; and irrigated with non saline water (control) and saline water (EC= 20 dSm). Both additive and dominance effects were significant for biomass; Na'and contents; K~+/Na~- stress tolerance index (STI); but there was a preponderance ofadditive gene action for biomass and (STI). Most of the characters showed directional dominance; dominance effects common to the progeny of a particular parent; and specific to a particular cross. There were significant differences between reciprocal crosses for all characters; except shoot dry weight in control treatment; indicating the presence of cytoplasmic inheritance or maternal influence. All traits showed considerable level of heterosis. The most tolerant parent; 'Roshan' (an Iranian old cultivar); was the best general combiner for most of the traits; followed by 'Kharchia'.