Legume Research

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Legume Research, volume 40 issue 3 (june 2017) : 470-477

Photosynthetic and antioxidant variability in soybean genotypes under Cadmium stress   

Faheema Khan*, Asma Al-Huqail
1<p>Department of Botany and Microbiology, College of Science King Saud University, Riyadh 11495, Kingdom of Saudi Arabia</p>
Cite article:- Khan* Faheema, Al-Huqail Asma (2017). Photosynthetic and antioxidant variability in soybean genotypes under Cadmium stress . Legume Research. 40(3): 470-477. doi: 10.18805/lr.v0i0.7853.

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.


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