Effects of drought stress on germination and photosynthetic pigments content of common bean (Phaseolus vulgaris L.) genotypes

Document Type : Research Paper


1 Former M. Sc. Student, Department of Agronomy and Plant Breeding, Agricultural Science and Engineering College, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran

2 Associate Professor, Department of Agronomy and Plant Breeding, Agricultural Science and Engineering College, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran


To evaluate the effects of drought stress on seed characteristics, seeds of the tolerant and sensitive genotyps of common bean were placed in petri dishes containing polyethylene glycol 6000 with concentration equal to -4, -8 and -12 bar, according to CRD Design with three replication using factorial arrengment, Nine day later, radicle and caulicle length were measured. The result showed that drought stress decreased germination speed and percentage, radicle and caulicle length, radicle fresh and dry weight, caulicle fresh and dry weight. To study the physiological processes, three genotypes including K-S-31167, GE-288 and Naz witch were respectivly tolerant, relatively tolerant and sensitive to drought stress were selected from first expriment and were subjected to 4 level of drought stress based on 25, 50, 75 and 100 percent of field capacity using CRD design with three replication using factorial arrengment, Droght stress was applied five weeks after planting and lasted for 10 days. Second terifoliate were used for sampling. The results indicated significant changes in the photosynthetic pigments content (PPC) and relative water content (RWC). Tolerant genotype (K-S-31167) had greater PPC and RWC compare to relatively tolerant genotype (GE-288) and sensitive genotype (Naz). This indicate that resistant genotype had higher membrane stability during stress.


Main Subjects

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