Correlations between resistance of tobacco to tobacco whitefly and chemical components of tobacco leaves
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Key Words：tobacco, Bemisia tabaci, chemical components, resistance to insects
Abstract： With the aim for the resistance mechanism to Bemisia tabaci (Gennadius)we determined the chlorophyll content of tobacco leaves, the chemical components in fresh or cured tobacco leaves, and analyzed the correlations between resistance of tobacco to B. tabaci and chemical components of tobacco leaves. Results show that significantly negative correlation occurs between the chlorophyll content in middle tobacco leaves and the population amount of B. tabaci . The ratio of K2O to Cl, sugar to nicotine, nitrogen to nicotine, and the contents of reducing sugar, nicotine, protein in fresh leaves are correlated with the resistance of tobacco variety to B. tabaci, yet with no significant level. Involving the chemical components of cured tobacco leaves, nicotine demonstrates the most evident and negative correlation to the amount of B. tabaci, while the ratio of nitrogen to nicotine, the positive. The total amount of amino acid is significantly positive correlated to the amount of B. tabaci. Six amino acids have greater effects on the resistance of tobacco variety, including serine、arginine、threonine、glutamic acid、leucine、lysine, with the correlation coefficient reaching significant level. We conclude that the contents of chlorophyll, nicotine, six amino acids, and the ratio of nitrogen to nicotine have more considerable effects on the resistance of tobacco variety to B. tabaci.