Czech J. Genet. Plant Breed., 2010, 46(1):27-34 | DOI: 10.17221/67/2009-CJGPB

Antioxidant enzymes changes in response to drought stress in ten cultivars of oilseed rape (Brassica napus L.)Original Paper

Tayebeh ABEDI, Hassan PAKNIYAT
Department of Crop Production and Plant Breeding, College of Agriculture, Shiraz University, Shiraz, Iran

The study was undertaken to identify the responses of antioxidant enzyme activities and their isozyme patterns in seedlings of 10 oilseed rape (Brassica napus L.) cultivars under drought stress conditions. Plants were grown under three irrigation regimes (FC; field capacity, 60% FC and 30% FC) in a greenhouse. Drought stress preferentially enhanced the activities of superoxide dismutase (SOD) and guaiacol peroxidase (POD) whereas it decreased catalase (CAT) activity. Licord with the highest level of enzyme activity under both optimum and limited irrigation regimes is reported as the most tolerant cultivar. Whereas Hyola 308 and Okapy, having the lowest enzymes activities, are mentioned as cultivars sensitive to drought stress. The native polyacrylamide gel electrophoresis (PAGE) analysis detected eight SOD isozymes. Oilseed rape leaves contained three isoforms of Mn-SOD and five isoforms of Cu/Zn-SOD. The expression of Mn-SOD was preferentially enhanced by drought stress. Five POD isoforms were detected in oilseed rape leaves. The intensities of POD-4 and -5 were enhanced under drought stress. According to the results, the appearance of new isozyme bands under drought stress conditions may be used as a biochemical marker to differentiate drought tolerant cultivars under drought stress.

Keywords: catalase; guaiacol peroxidase; isozymes; oilseed rape; superoxide dismutase; water stress

Published: March 31, 2010  Show citation

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ABEDI T, PAKNIYAT H. Antioxidant enzymes changes in response to drought stress in ten cultivars of oilseed rape (Brassica napus L.). Czech J. Genet. Plant Breed.. 2010;46(1):27-34. doi: 10.17221/67/2009-CJGPB.
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