J. Bio. Env. Sci.5(5), 143-148, November 2014
Eight spring wheat genotypes were crossed in half diallel fashion for heterosis, heterobeltosis and inbreeding depression studies. Six traits including plant height, flag leaf area, number of tillers per plant, number of grains per spike, 1000-grian weight and grain yield per plant were recorded under two different environments (E1 and E2). Maximum heterosis and heterobeltosis (39.84%) and (23.29%), were exhibited in the crosses, Pavon / 076397 and 076396 / Aas-11, respectively under E1. Highly significant heterosis (14.72%) was showed by the cross Pavon / 076396 while the cross Pavon / 076397 gave highly significant grain yield (8.74%) over better parent under E2. As concerned inbreeding depression, superiority of F1 over F2 was observed in most of the crosses in both environments. For yield and some yield related traits, most of combinations exploited the significant inbreeding depression under both environmental conditions. Number of grains per spike was important for heterosis, while better tillering, high 1000 grain weight with less negative growth and dwarfness were important in some of the hybrid combinations.
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