| A study on the physiological and biochemical changes during storing and its main reasons causing vigor descent of wheat seeds were conducted to further explore the process of seed deterioration. The Waxy and non waxy wheat seeds were selected and then artificial aged under 55 ℃ and 90%RH, the physiological and biochemical indexes, such as germination rate, conductivity, Malondialdehyde (MDA) content, soluble sugar content, soluble protein content, Superoxide dismutase (SOD) activity, Percxidase (POD) activity, and Catalase (CAT) activity were studied. The results showed that with the artificial aging progressing, there was a gradual decrease in the germination rate, but a slight increase on the conductivity; the non waxy wheat seeds were higher than the waxy wheat seeds in germination rate, but lower in conductivity at the same treatment. POD and SOD activities of non waxy wheat seeds were significantly higher than that of waxy wheat seeds, however, soluble sugar, soluble protein and MDA contents of non waxy wheat seeds were notably lower than that of waxy wheat seeds. Aging resistance of non waxy wheat seeds were higher than that of waxy seeds. |
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