Assessment of Variation in Physiological Growth Indices in Common Bean Genotypes Under Water Deficit Condition

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Abstract

To evaluate the effect of water deficit stress on growth, yield and relationship between growth indices in common bean (Phaseolus vulgaris L.) genotypes, two field studies were performed as split plot arrangement in randomized complete block design with four replications in 2009 and 2010 in Seed and Plant Improvement Institute, Karaj, Iran. Eight genotype (WA4502-1, WA4531-17, D81083, AND1007, Akhtar, COS16, MCD4011, and KS21486) were studied under two irrigation regimes normal and water deficit conditions. Results showed that water shortage caused significant decrease in LAI in all genotypes. In stress condition, until early pod filling duration (PFD), AND1007 had higher LAI than other genotypes, however by the end of this stage WA4502-1 was superior. AND1007 genotype had higher CGR than others. Water deficit caused 50% reduction in seed yield. Seed yield loss (%) by drought in AND1007 and D81083 genotypes was the highest and the lowest, respectively. Physiological responses of evaluated genotypes varied in terms of drought tolerance or sensitivity. In this study, drought intensity index (DII) was 0.50. AND1007, COS16 and MCD4011 genotypes were more tolerant based on DTI, DSI, MP and GMP. Generally, white bean genotypes were more drought sensitive than the red and chitti genotypes.

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Seed and Plant Production Journal
Volume 30, Issue 2
July 2014
Pages 199-222

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