Yield Association with Morph-physiological Traits under Drought Stressin Grain Sorghum Genotypes

This study was conducted in order to evaluation effect of drought stress on some morph-physiological traits correlated with yield in ten-grain sorghum genotypes kept at National Plant Gene Bank of Iran. Field experiments were in 3 different conditions including normal condition and two water deficit conditions in vegetative and reproductive stage in Torogh Agricultural Research Station (Khorasan Razavi Agricultural and Natural Resource Research Center, Mashhad-Iran) using complete randomized block design with 3 replications. In non stress experiment, irrigation operated normally and for 2 another experiments (1) drought stress treated in vegetative period (from 4 leaves up to flowering stage) and (2) drought stress treated in reproductive period (from flowering up to maturity), irrigation was stopped during of stress period. Traits were analyzed included: time of flowering, plant height, and number of fertile tillers, stem diameter, length of panicle, shoot dry matter, seed yield per plant, and 100 seed weight. The results of this study showed genotypes had significant difference