Abstract: This study investigated the effect of adding different concentrations of CO2 and LED light supplementation in the greenhouse during autumn and winter on the quality and volatile components of tomato fruits from the ‘Jinpeng No. 1’ cultivar. Results indicated that treatment with 1 200 μL/L CO2 + LED supplementation significantly improved the soluble solid, total acid and soluble protein contents in tomato fruits, and the fruit weight, and also increased the lycopene content and fruit coloration while significantly reducing the content of nitrate nitrogen in fruits. Headspace solid phase extraction and gas chromatographymass spectrometry were used to analyze the volatile components of tomato fruits under different treatments. Results showed that CO2 enrichment and LED light supplementation increased the contents such as 6-methyl-5-hepten-2-ketone, β-ionone and hexanal in tomato fruits and types of characteristic compounds, making the fruity aroma stronger and richer.

Key words: CO2 enrichment, LED light supplementation, tomato, quality, volatiles