In order to study the effect of drought stress on morphophysiologic characteristics, yield and yield components of 8 new hybrids of corn (Zea maize L.) and KSC704 commercial hybrid as control resistant to drought and warm (which were bred and screened in Khozestan province condition), an experiment was conducted in a Randomized Complete Block Design (RCBD) with three replications under drought stress and normal irrigation at Khorasan-Razavi Agriculture Research Center, Mashhad, Iran on June 10, 2011. The results of analyze variance showed that under normal irrigation and drought condition, there was a significant difference (p<0.01) between the hybrids. Mean comparison of hybrids revealed that in normal irrigation H6 and in drought stress H8 hybrid had the maximum grain yield (12.85 and 6.75 ton/ha, respectively). Based on the grain yields of studied hybrids, stress tolerance index (STI), stress susceptibility index (SSI), tolerance index (TOI), mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HM) and golden mean (GM) were estimated. Results showed that among drought tolerance indices, MP, GMP, STI and HM were the best indices for corn and KSC704 hybrid and H4 had the highest tolerance to drought in Mashhad weather condition.

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