Physiological Effects of CO_2 Enrichment on Lycopersicon esculentum var. cerasiforme in the Plastic House
Carbon dioxide is one of the most important factors limiting vegetable photosynthesis.Applied 600～1 200 μmol·mol -1 CO 2 to the plastic house could increase photosynthetic rates and ratio of C/N,promote vegetative and reproductive growth of Lycopersicon esculentum var.cerasiforme plants.Plant height,stem diameter,leaf thickness and leaf area increased by 7 95%～37 11%,21 33%～74 67%,29 25%～42 45% and 14 64%～40 24%,respectively.Primary flower head position decreased,and average single fruit weight and yield were 7 94%～20 63% and 6 21%～13 91% higher than that in normal air.The optimum concentration of CO 2 in L.esculentum var.cerasiforme in spring was about 1 000 μmol·mol -1 .