Analysis of the variation of bases of epsps of brassicaceae , solanaceae and poaceae indicate that the evolutionary rates of epsps are different between brassicaceae and solanacea e and the rate in solanaceae is higher than the rate in brassicaceae according to the total substitution rate of bases 分别对十字花科、茄科、禾本科序列的碱基变异情况分析，结果表明， epsps基因在十字花科和茄科中的进化速率不一样，对于总的碱基替换率，茄科高于十字花科。
The sesults show that there were 48 species ( variety ) of plant belonging to 14 families as hosts of b . tabaci , among which cucurbitaceae , solanaceae , cruciferae , euphorbiaceae , labiatae , leguminosae and malvaceae are the main host families , and the plants of families of cucurbitaceae and solanaceae are damaged most seriously 结果表明，烟粉虱的寄主有14科48种（变种） ，主要寄主植物是葫芦科、茄科、十字花科、豆科、锦葵科、菊科等；其中，茄科和葫芦科的植物受害最重。
The aim of this work is to have a better understanding of the structure , differentiation and phylogenetic relationship of the tribe hyoscyameae in the solanaceae using evidence from leaf epidermis , seed morphology , palynology , embryology , floral organogenesis , trnl - f and its sequences , and plant geography . the results are summarized as follows : 1 . leaf epidermis leaf epidermis of 21 species in seven genera of the tribe hyoscyameae and four species in four related genera was investigated under both light microscope ( lm ) and scanning electron microscope ( sem ) 解剖学在光学显微镜和扫描电镜下，观察了茄科天仙子族( hyoscyameae ) 7属21种及邻近4属4种共25种植物的叶表皮特征，结果表明：气孔器在各种植物的上、下的表皮均有分布，多为无规则型，也有不等细胞型；叶表皮细胞形状有不规则形、十字形、近长圆形和不规则多边形，垂周壁较平直或各种波状。
