alexa Heat exposure alters the expression of SOD, POD, APX and CAT isozymes and mitigates low cadmium toxicity in seedlings of sensitive and tolerant rice cultivars.
Agri and Aquaculture

Agri and Aquaculture

Advances in Crop Science and Technology

Author(s): Shah K, Nahakpam S

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Abstract A 0-500 μM Cd(2+) alone and/or heat stress in rice cv. DR-92 (sensitive) and cv. Bh-1 (tolerant), altered the banding patterns of SOD, CAT, POD and APX enzymes in roots/shoots. In controls, six/seven activity bands for POD in roots/shoots were observed. The band intensities of some decreased under combination of Cd(2+) + heat stress. Six SOD isoforms in shoots of cv. Bh-1 and three in cv. DR-92 appeared. In sensitive cv. DR-92 a trinuclear Cu/Zn/Mn-SOD 1 isozyme was upregulated in shoots under Cd/HS/Cd + HS treatments whereas a suppression in the same was noticed in roots. Under Cd alone the Cu/Zn/Mn-SOD 2 was strongly induced in roots which was otherwise absent in all HS treatments. POD R7 band was absent in HS alone but was induced under Cd(2+) + HS treatments in rice cv. DR-92. In tolerant cv. Bh-1, isozyme Mn-SOD 3 was induced under Cd alone but was absent under HS. Cu/Zn/Mn-SOD 2 and Cu/Zn/Mn-SOD 3 were strongly induced in roots and shoots under low or moderate Cd(2+) + HS treatments. APX R4/CATR2 isozymes which were absent under Cd(2+) alone or HS alone were induced under combination of Cd(2+) + HS indicating de novo synthesis of enzyme proteins under combined stressors. Decreased band intensities under Cd(2+) + HS suggest a cross-talk between response pathways of Cd(2+) and heat stress in rice. Results suggest Cd(2+) specific, heat-specific, tissue specific and differential expression of SOD/POD/APX/CAT and that Mn-SOD 3/APXR4/CATR2 seem to form important components of antioxidant defense in rice roots under combination of Cd(2+) + HS which helps to mitigate the effect of low Cd(2+) toxicity in tolerant rice cv. Bh-1. Copyright © 2012 Elsevier Masson SAS. All rights reserved. This article was published in Plant Physiol Biochem and referenced in Advances in Crop Science and Technology

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