Photosynthetica, 2009 (vol. 47), issue 1

Photosynthetica 2009, 47(1):146-151 | DOI: 10.1007/s11099-009-0024-5

Effects of cadmium stress upon activities of antioxidative enzymes, photosynthetic rate, and production of phytochelatins in leaves and chloroplasts of wheat cultivars differing in yield potential

I. Ahmad1,*, M. Naeem2, N. A. Khan2, Samiullah2
1 Department of Biotechnology, Dr. B.R. Ambedkar National Institute of Technology, Jalndhar, India
2 Plant Physiology Section, Aligarh Muslim University, Aligarh, India

We tested the mode of action of Cd on photosynthesis and activities of ATP-sulfurylase (ATP-S), catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX), glutathione reductase (GR), and on contents of phytochelatins (PCs) and glutathione (GSH) in two cultivars of wheat (Triticum aestivum L.) PBW-343 and WH-542 differing in yield potential. Cd treatment increased Cd content and photosynthetic activity in PBW-343 more than in WH-542. The activities of APX, GR, ATP-S, and synthesis of PCs and GSH were also increased by Cd, but the CAT and SOD activities were inhibited in both the cultivars. The efficient functioning of antioxidative enzymes, production of PCs and GSH, helped in counteracting the effects of Cd namely in PBW-343, protected photosynthetic ability, and increased the tolerance to Cd.

Keywords: ascorbate peroxidase; ATP-sulfurylase; catalase; glutathione; glutathione reductase; stomatal conductance; superoxide dismutase; Triticum; water use efficiency

Received: May 15, 2008; Accepted: October 20, 2008; Published: March 1, 2009Show citation

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Ahmad, I., Naeem, M., Khan, N.A., & Samiullah, (2009). Effects of cadmium stress upon activities of antioxidative enzymes, photosynthetic rate, and production of phytochelatins in leaves and chloroplasts of wheat cultivars differing in yield potential. Photosynthetica, 47(1), 146-151. doi: 10.1007/s11099-009-0024-5.
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