The present work was carried out to reveal the effects of late-season drought stress on the seed antioxidant potential and deterioration. In the field, two irrigation regimes were applied (control and late-season drought). Produced seeds were subjected to accelerated ageing (40 ±
2°C, 100% RH for 0, 24, 48, 72 and 96 hours) and then a standard germination test. Seed germination was decreased by drought. Accelerated ageing decreased germination of seeds from both control and drought-stressed plants. Late-season drought, increased seed deterioration susceptibility
according to malondialdehyde content and electrical conductivity tests. There was a negative correlation between germination and electrical conductivity as well as malondialdehyde content. Superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR)
activities decreased continuously with increasing ageing period. However, accelerated ageing increased the monodehydroascorbate reductase and dehydroascorbate reductase. Activities of peroxidase, dehydroascorbate reductase, monodehydroascorbate reductase and APX were higher in the seeds from
drought-stressed plants than in the control ones. Ascorbate / dehydroascorbate and reduced glutathione / oxidised glutathione ratios was decreased by the late-season drought. Total ascorbate was lower in the seeds from control plants than stressed ones. All accelerated ageing levels except
24 hours, increased total ascorbate in the drought-stressed seeds. Total glutathione content had a negative trend with increase in the duration of accelerated ageing. The results suggest a relationship between seed deterioration in seeds from both control and drought-stressed plants with a
decrease in important reactive oxygen species scavenging enzymes (except peroxidase) and an increase in lipid peroxidation.
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Document Type: Research Article
July 1, 2016
This article was made available online on May 18, 2016 as a Fast Track article with title: "Effects of late-season drought stress on physiology of wheat seed deterioration: changes in antioxidant enzymes and compounds".
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