Abstract:

The seedlings of tomato at two or five leaves stage were treated with BR in this experiment,and the affects of low temperature stress on some physiological indexs were determined.The results showed that these BR solutions of different concentrations reduced the cell membrane permeability,restrained the MDA production,increased the content of solubility sugar ,proline and the vitality of root system,and improved the low temperature stress resistance ability.Comprehensive analysis of various physiological indexs showed that the treating of 5 leaves old tomatoes by 0.1mg/L BR can lower 32.7% to CK in chilling injury index，58.4% to CK in EC，and the content of MDA was just 25.5649nmol/g，the solubility sugar 137.27umol/g，the proline 542.3ug/g.And the vitality of root system had a stable change range which is 20.9%.