Effects of salinity stress on carbohydrate metabolism in Cryptocoryne elliptica cultures
2018
Aziz Ahmad | Azmi Ismun | Mariam Taib
Salinity limits water availability in plants, and lead to osmotic stress. Soluble carbohydrate or sugar plays crucial roles as osmolytes in salinity stress by regulating osmotic adjustment and carbon storage in plants. The involvement of salt in the biosynthesis and degradation of starch and sucrose in plants is poorly understood. In the present study, effect of salinity levels on the activity of main enzymes involved in carbohydrate metabolism was investigated. An aquatic plant, Cryptocoryne elliptica plantlets was challenged with salinity levels at 100 and 200 mM of NaCl for five weeks. Results showed that the salinity stress had decreased the plantlet growth and the activity of glucosidase and galactosidase enzymes. Under salinity conditions, the starch content, the activity of amylase, invertase, hexokinase and glucose-6-phosphate dehydrogenase enzymes were significantly increased during the recovery phase ofsalinity stress. Salinity conditions had no significant effects on the phosphoenolpyruvate carboxylase activity. These results suggest that C. elliptica regulates carbohydrate metabolism under salinity conditions, and has moderate response towards sodium ion, Na+ in the culture medium.
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