Sucrose Enhances Tyrosine-induced Inhibition of Growth in Arabidopsis Seedlings

摘要

Tyrosine (Tyr) and sucrose (Suc) play an important role in plant growth.However,the crosstalk between Tyr and Suc in regulating the plant growth has remained unclear.In this study,it was found that Suc is able to enhance Tyr-induced inhibition of growth in Arabidopsis seedlings.Both fresh weight and root length of Arabidopsis seedlings were significantly reduced when the medium was added with high concentrations (such as 0.5 or 1.0 mM)of Tyr whereas they were clearly increased with an addition of appropriate concentrations of Suc (such as 1 or 3%) in the medium,which suggested that the growth of Arabidopsis seedlings is inhibited by high concentrations of Tyr but promoted by appropriate concentrations of Suc.Interestingly,the inhibition of growth in Arabidopsis seedlings by 0.5 or 1.0 mM Tyr was significantly intensified once 1%or 3%of Suc was added in the medium.This study revealed a positive effect of Suc on the Tyr-induced inhibition of plant growth,and the results help us to further investigate the crosstalk of Suc and Tyr in the regulation of plant growth.