Effects of Exogenous NO Treatment on the Postharvest Quality and Ethylene Metabolism of Fresh Lotus Seeds
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
In order to investigate the effects of nitric oxide (NO) treatment on ethylene metabolism in postharvest fresh lotus seeds, the fresh “Space Lotus No. 36” lotus seedpods were treated firstly with different concentrations of NO, before storage at (25±1) ℃. The optimal concentration of NO was screened through analyzing the color difference and phenotype of lotus seedpods and seeds. On this basis, the effects of NO treatment on the respiration of fresh lotusseed pods, and the quality and ethylene metabolism of lotus seeds were studied. The results showed that the treatment with NO at 0.25 mmol/L significantly maintained the qualities of lotus seedpods and seeds, significantly slowed down the decreases of soluble sugar and starch in the lotus seeds, and inhibited the respiration rate of lotus seedpods from the 2nd to 4th day (while enabling the release of ethylene over 19.93% after 4 days) inhibited the accumulation of 1-aminocyclopropane-1-carboxylic acid (ACC) in lotus seeds. Meanwhile this NO treatment inhibited the activities of ACC synthetase (ACS, over 46.72% after 4 days) and ACC oxidase (ACO, over 14.79% during day 2~4) in the lotus seeds, while maintaining a relatively high methionine (Met) content in lotus seeds (but exerting insignificant effect on the content of s-adenosine methionine (SAM)). Therefore, this NO treatment prolonged the shelf life of lotus seedpods and seeds by 2~3 days. In conclusion, NO treatment can inhibit effectively preserve the quality of lotus seeds and inhibit the synthesis of ethylene in lotus seeds, thereby delaying the senescence of lotus seedpods and seeds. This study provides theoretical and technical support for the postharvest preservation of fresh lotus seedpods and seeds.
