Photosynthetic and antioxidant variability in soybean genotypes under Cadmium stress   

DOI: 10.18805/lr.v0i0.7853    | Article Id: LR-278 | Page : 470-477
Citation :- Photosynthetic and antioxidant variability in soybean genotypes under Cadmium stress .Legume Research-An International Journal.2017.(40):470-477

Faheema Khan* and Asma Al-Huqail

drfaheemakhan@gmail.com
Address :

Department of Botany and Microbiology, College of Science King Saud University, Riyadh 11495, Kingdom of Saudi Arabia

Submitted Date : 17-02-2016
Accepted Date : 10-02-2017

Abstract

Soybean, the worldwide main source of oil and high protein feeds for the livestock sector has a high cadmium (Cd) accumulation capacity. With this background, the hydroponic culture experiments were conducted to investigate the effects of different concentrations of Cd (0-100 µM) on growth, water relations, photosynthetic variables, oxidative stress, and antioxidant response in two soybean genotypes P-218 and P-898. Ten days old seedlings were subjected to (0-100 µM CdCl2) for 15 days. The results indicated that the growth of genotype P-218 was not affected significantly upto 75 µM CdCl2 treatment growth of P-828 was reduced significantly beyond 25 µM CdCl2 treatments. Cd toxicity caused severe impairments in photosynthetic variables like photosynthetic rate, chlorophyll fluorescence and chlorophyll content, in P-898 than in P-218. The activities of antioxidant enzymes (superoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase) were higher in P-218 than in P-828 at various levels of Cd treatments. Chlorophyll fluorescence measurements revealed that non-photochemical quenching increased in P-218 and decreased in P-828 whereas the electron transport rate increased under Cd stress in P-828 and decreased in P-218. It is concluded that tolerance capacity of P-218 against Cd can be associated with the capability of this genotype in keeping an active photosynthetic system and strong antioxidant defense system.

Keywords

CdCl2 Chlorophyll fluorescence Lipid peroxidation Oxidative stress Soybean.

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