Biologia Plantarum

, 52:137 | Cite as

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

Brief Communication


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.

Additional key words

asorbate peroxidase calmodulin catalase glutathione reductase reactive oxygen species 



ascorbate peroxidase




5,5-dithio-bis-2-nitrobenzoic acid


glutathione reductase


heat stress


relative growth index


membrane protein thiol level


relative germination performance


reactive oxygen species


superoxide dismutase




thiobarbituric acid reactive substances


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Copyright information

© Institute of Experimental Botany, ASCR 2008

Authors and Affiliations

  1. 1.PostgraduateDepartment of BotanyHooghly Mohsin College, ChinsurahWest BengalIndia

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