Effect of different light intensities on the photosynthate distribution in cherry tomato seedlings

摘要

To investigate the effect of varying the light intensity on the photosynthate distribution, cherry tomato (Solanum lycopersicum L.) seedlings were grown under different light intensities. It was found that the seedlings under 300 mu mol m(-2) s(-1) had a significantly higher dry weight and health index (Health index=Stem diameter/Stem height x Dry weight) than seedlings receiving other light treatments. On the contrary, the biomass, specific leaf mass and health index values of seedlings exposed to 50 mu mol m(-2) s(-1) and 550 mu mol m(-2) s(-1) were the lowest among all of the treatments. In terms of C-14-labelled photosynthate translocation, the seedlings under 300 mu mol m(-2) s(-1) had lower remaining C-14-labelled photosynthate (31.45%) compared with other treatments, after (CO2)-C-14 was supplied for 2days. The seedlings under 150 mu mol m(-2)s(-1) had 36.97% of C-14-labelled photosynthate in the labelled leaves and transported the obviously higher C-14-labelled photosynthate to new shoot than others. Together, our results indicate that the photosynthate distribution was the most rational in cherry tomato seedlings at 300 mu mol m(-2) s(-1), which enhanced leaf photosynthesis and plant growth.