7-1-2 Ahmed et al


F. Ahmed*, M.A. Jahan, M. A. Zaman, M. M. Roman and K. N. Islam
*Corresponding Author’s Email: faruquebari@gmail.com


A field experiment was conducted on 6 selected maize genotypes (V1 = P1 x P4, V2 = P1 x P7, V3 = P2 x P6, V4= Q8 x Q 8, V5 = BARI Hybrid Maize 5 and V6 = Suvrah) under well watered and drought situation (irrigate with wilting symptom visible + one irrigation at tasseling stage) to find out suitable genotypes for drought environment. Drought reduced leaf chlorophyll content (SPAD), leaf area index (LAI), total dry matter production (TDM) and ultimately reduced grain yield. However, genotypes varied in the reduction of growth parameters and yield due to drought stress. Among the genotypes, V1, V4 and V3 showed higher LAI, TDM and grain yield (8.73, 8.51 and 8.03 t ha-1, respectively) compared to others. But genotypes V6 and V5 produced the lowest grain yield (7.07 t ha-1 and 7.29 t ha-1). Drought affected enzymes activity of the genotypes. It increased activity of catalase (CAT) and ascorbate peroxidase (APX) in maize genotypes. These enzymic antioxidants are used to reduce the damaging effect of reactive oxigen species (ROS) in plant cell under drought stress. Among the maize genotypes, V1, V4 and V3 showed higher CAT and APX activity under drought than others indicating that these genotypes are more capable to withstand in drought situation compared to others. Besides, these genotypes showed higher stress tolerance index (STI) and Geomatric Mean Productivity (GMP) compared to others. Results revealed that genotypes V1, V4 and V3 would be suitable for growing under soil moisture scarce environment.  
Key words: Antioxidant, maize genotypes, drought and yield.

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