Growth and ion accumulation of Avicennia marina and Kandelia obovata seedlings grown under hydroponic culture with different salinity

Abstract

Growth, survival rate, Na+ and leaf betaine concentration were investigated on Avicennia marina and Kandelia obovata seedlings grown in hydroponic culture with different salinity for 1-month. Survival rate and biomass of both species did not differ with salinity. In K.obovata seedlings, Na⁺ concentration in root increased significantly by 4% salt treatment, and ratio of Na⁺ to K⁺ increased in hypocotyl and root. In A. marina seedlings, Na⁺ concentration and ratio of Na⁺ to K⁺ in every plant part increased significantly by 2-4% salt treatment. Leaf alanin betaine (AB) concentration did not differ with salt treatment, whereas glycine betaine (GB) concentration in K. obovata and A. marina increased with increase in salt treatment.