Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 48 1 2017 05 22 Effects of drought stress on germination and photosynthetic pigments content of common bean (Phaseolus vulgaris L.) genotypes Effects of drought stress on germination and photosynthetic pigments content of common bean (Phaseolus vulgaris L.) genotypes 107 119 62379 10.22059/ijfcs.2017.138046.653997 FA Elham Soltani 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 Abdol Hadi Hosseinzadeh Associate Professor, Department of Agronomy and Plant Breeding, Agricultural Science and Engineering College, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran 0000-0003-2241-2359 Alireza Abbasi Associate Professor, Department of Agronomy and Plant Breeding, Agricultural Science and Engineering College, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran 0000-0003-3598-0419 Journal Article 2015 12 08 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. 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. https://ijfcs.ut.ac.ir/article_62379_e564204118c7b090cc3c5af475b5db60.pdf