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以10个不同抗性水平的辣椒品种为材料,通过笼内释放烟粉虱的方法,研究了不同辣椒品种对烟粉虱寄主选择的影响,同时通过对辣椒叶片茸毛密度、维管束埋深、叶片蜡质含量、叶片颜色等4个主要物理性状的分析,探讨了辣椒叶片物理性状对烟粉虱的抗选择性机制。结果表明:烟粉虱对不同品种辣椒的选择性存在明显的差异,不同品种辣椒叶片茸毛密度、维管束埋深、蜡质含量以及叶片颜色也存在明显的差异;烟粉虱在不同品种辣椒上落虫量与物理性状的相关性分析发现,叶片茸毛密度与烟粉虱成虫量存在显著正相关,维管束埋深和叶片颜色与烟粉虱成虫量存在显著负相关,而蜡质含量与烟粉虱成虫量没有显著的相关性;释放24 h后,叶片茸毛密度、维管束埋深和叶片颜色与烟粉虱虫量的回归方程分别为:Y=0.632x+13.493(r=0.953,P=0.000)、Y=-587.572x+449.035(r=0.660,P=0.038)、Y=-209.815 x+259.088(r=0.642,P=0.046);成虫量(Y)与叶片茸毛密度(X_1)、维管束埋深(X_2)、叶片颜色(X_4)的多元逐步回归方程为:Y=0.583X1+26.999 X2-56.126 X4+56.953,通径系数分别为P茸毛密度→Y=-0.879、P维管束埋深→Y=0.030、P叶片颜色→Y=-0.172;释放72 h时叶片颜色与烟粉虱成虫量没有明显的相关性。表明在烟粉虱寄主选择的前期,叶片颜色起最主要的作用,72 h时后叶片茸毛密度起最主要的作用;产卵选择与取食选择趋势基本一致。
Ten pepper cultivars with different resistance levels were used to study the effects of different pepper varieties on the host selection of B. tabaci by releasing Bemisia tabaci through the cage. At the same time, the effects of different pepper varieties on the hairy density, depth of vascular bundle, Leaf wax content, leaf color and other four major physical properties of the analysis of the physical properties of pepper anti-whitefly anti-selective mechanism. The results showed that there were significant differences in the selectivity of B. tabaci for different varieties of pepper. There were also significant differences in hair density, depth of vascular bundle, wax content and leaf color among different varieties of pepper. The correlation analysis between the amount of shedding and the physical traits found that the leaf hair density and the population of Bemisia tabaci had a significant positive correlation, the depth of the vascular bundle and the leaf color and the Bemisia tabaci adults were negatively correlated, but the wax content and the smoke There were no significant correlations between adult whitefly and adult whitefly. The regression equations of leaf hair density, depth of vascular bundle, leaf color and the population of B. tabaci were 24 h after release (Y = 0.632x + 13.493, r = 0.953, P Y = -587.572x + 449.035 (r = 0.660, P = 0.038), Y = -209.815 x +259.088 (r = 0.642, P = 0.046) , The depth of vascular bundle (X_2) and the leaf color (X_4) were as follows: Y = 0.583X1 + 26.999 X2-56.126 X4 + 56.953, the path coefficients were P → r = -0.879, P Depth of tube bundle → Y = 0.030, P leaf color → Y = -0.172; Leaf color and the amount of adults of Bemisia tabaci were not significant at 72 h Relevance. The results showed that the leaf color played a major role in the early stage of host selection of B. tabaci, and the density of leaf hair was the most important role after 72 h. The trend of selection of oviposition and feeding was basically the same.