Diallei Analysis of Agronomic, Physiological and Metabolite Indicators of Drought Tolerance in Bread Wheat (Triticum aestivum L.)

摘要

Inheritance of grain yield, physiological and metabolite indicators of drought tolerance was studied in diallel F_1 hybrids from 8 cultivars of Triticum aestivum, selected for their different responses to drought stress. Significant differences were found for grain yield (GY), relative water content (RWC), cell membrane stability (CMS), proline content (PC) and leaf chlorophyll content (LCC). Combining ability analysis indicated the involvement of additive and non-additive gene action in their inheritance. Parents 5 and 7 were the best general combiner for improvement of drought tolerance. The best specific combination with heterobeltiosis over the best parents for improvement of GY, RWC, CMC, PC and LCC were crosses 4 x 6, 1 x 6, 6 x 8, 3 x 8 and 2x3, respectively. High broad sense heritability observed for all the traits, but the rule of additive part was low. Graphic analysis showed that inheritance varied from dominance to overdominance, but presence of overdominance was exhibited for GY, RWC,PC and LCC. Non- allelic interaction was also found for PC and LCC, therefore selection through selling is not effective for improvement of PC and LCC.