Q型烟粉虱对不同烟草品种的选择性

The selectivity of Q-biotype Bemisia tabaci for different varieties of tobacco, Nicotiana tabacum

【目的】明确Q型烟粉虱对不同烟草品种的选择性及与叶背茸毛密度的相关性,为烟草抗虫品种的选育应用及对该虫的综合治理提供理论依据。【方法】在控制条件下,进行选择性试验、非选择性试验,观察发育历期和叶背茸毛数量。【结果】烟草品种对Q型烟粉虱成虫选择性、产卵趋性及卵-成虫的发育历期影响显著,叶背茸毛密度与成虫趋性及产卵量之间具有显著相关性。在供试的8个烟草品种中,‘CF225’、‘CF226’叶背茸毛密度高,Q型烟粉虱对它们的选择性强,表示这两个品种的烟草的抗虫性弱;‘云烟117’、‘K328(C8)’叶背茸毛密度低,Q型烟粉虱对它们的选择性弱,表示这两个品种的烟草的抗虫性强。【结论】选育少毛的烟草品种,可以提高烟草对Q型烟粉虱的抗性,本结果对烟草抗虫品种的选育有一定的参考价值。

[Objectives] The selectivity of Q-biotype Bemisia tabaci （Gennadius） for different varieties of tobacco and the correlation between plant trichome density and host selection were investigated, with the objective of providing a theoretical foundation for screening insect-resistant tobacco varieties and management of this pest. [Methods] Tests to determine the relative host plant preferences and developmental duration of Q-biotype B. tabaci with respect to tobacco plants with different trichome densities were performed under controlled conditions. [Results] Host preferences, adult oviposition topotaxis and egg-adult developmental duration were significantly different on different tobacco varieties. Trichome density was significantly correlated with adult host preference and the number of eggs laid. Among the eight tobacco varieties tested, B. tabaci exhibited the highest preference for ＇CF225＇ and ＇CF226＇, which had the highest trichome density, suggesting that these two varieties had low resistance to B. tabaci. B. tabaci displayed the least preference for ＇Yunyan117＂ and ＇K326 （C8）＇ which had the lowest trichome density, implying that these two varieties were more resistant to B. tabaci. [Conclusion] Breeding tobacco varieties with fewer trichomes could improve their resistance to Q-biotype B. tabaci. The results provide a reference for breeding insect-resistant tobacco varieties.