烟草对烟粉虱的抗性与烟草化学成分的相关性
Correlations between resistance of tobacco to tobacco whitefly and chemical components of tobacco leaves
任广伟**，王新伟，王秀芳，陈丹
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作者单位：中国农业科学院烟草研究所青岛266101
中文关键词：烟草， 烟粉虱， 化学成分， 抗虫性
英文关键词：tobacco, Bemisia tabaci, chemical components, resistance to insects
中文摘要： 为探明烟草对烟粉虱Bemisia tabaci（Gennadius)的抗性机制，分别测定了不同烟草品种的叶绿素相对含量、鲜烟叶及烤后烟叶的化学成分含量，并分析了烟草抗虫性与烟草化学成分的关系。结果表明，中部叶片叶绿素含量与烟粉虱数量呈负相关，相关系数达到了显著水平；鲜烟叶化学成分钾氯比、糖碱比、氮碱比、还原糖、烟碱、蛋白质与烟草品种抗虫性均有一定相关性，但相关系数均未达到显著水平；烤后烟叶化学成分中以烟碱与虫量的相关性最强，且呈负相关，氮碱比与虫量呈正相关。氨基酸总量与烟粉虱虫量呈显著正相关，对烟草品种抗虫性影响较大6种氨基酸为丝氨酸、精氨酸、苏氨酸、谷氨酸、亮氨酸、赖氨酸，相关系数均达到了显著水平。综上，对烟草品种抗虫性影响较大的化学指标为中部叶片的叶绿素、烟碱、6种氨基酸含量以及氮碱比。
英文摘要： 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.