biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 52:137-140, 2008 | DOI: 10.1007/s10535-008-0028-1

Calcium-dependent signaling pathway in the heat-induced oxidative injury in Amaranthus lividus

S. Bhattacharjee1,*
1 PostgraduateDepartment of Botany, Hooghly Mohsin College, Chinsurah, West Bengal, India

Heat caused reduction in membrane protein thiol content, increased accumulation of thiobarbituric acid reactive substances and reduced germination rate and early growth in germinating Amaranthus lividus seeds. Imposition of heat stress during early germination also causes accumulation of reactive oxygen species like superoxide and hydrogen peroxide while activities of antioxidative enzymes catalase, ascorbate peroxidase, and glutathione reductase decreased. Calcium chelator (EGTA), calcium channel blocker (LaCl3) and calmodulin inhibitor (trifluroperazine) aggravated these effects. Added calcium reversed the effect of heat, implying that protection against heat induced oxidative damage and improvement of germination requires calcium and calmodulin during the recovery phase of post-germination events in Amaranthus lividus.

Keywords: asorbate peroxidase; calmodulin; catalase; glutathione reductase; reactive oxygen species
Subjects: Amaranthus lividus; ascorbate peroxidase; Ca-dependent signaling pathway; calmodulin; catalase; glutathione reductase; heat stress, high temperature; reactive oxygen species (ROS); superoxide dismutase (SOD); temperature, high

Received: November 6, 2006; Accepted: October 25, 2007; Published: March 1, 2008  Show citation

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Bhattacharjee, S. (2008). Calcium-dependent signaling pathway in the heat-induced oxidative injury in Amaranthus lividus. Biologia plantarum, 52(1), 137-140. doi: 10.1007/s10535-008-0028-1
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