Biodiv Sci ›› 2008, Vol. 16 ›› Issue (4): 313-320.  DOI: 10.3724/SP.J.1003.2008.08050

• Original Papers •     Next Articles

Effects of plant species switching on dynamics of amylase and proteinase activity of Bemisia tabaci biotype B and Trialeurodes vaporariorum

Zhang Guifen1, Lei Fang1,2, Wan Fanghao1,*(), Ma Jun1,2, Yang Yuguo3   

  1. 1 State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094
    2 College of Bio-Safety Science and Technology, Hunan Agricultural University, Changsha 410128
    3 Agricultural Corporations of Mapo Township, Shunyi, Beijing 101300
  • Received:2008-03-05 Accepted:2008-07-02 Online:2008-07-20 Published:2008-07-20
  • Contact: Wan Fanghao

Abstract:

Bemisia tabaci biotype B (Bt) and Trialeurodes vaporariorum(Tv) are two whiteflies that often coexist on greenhouse-grown vegetable crops in northern China. The host plant species ofB. tabaci biotype B have been increasing with the spread of its invaded areas. To clarify the effects of plant species on the performances of the two species, amylase and proteinase activity dynamics of both whitefly species were evaluated when their host plant species switched from tomato (preferred by both species, also used as the control) to cotton (preferred by Bt and suitable for Tv), cabbage (preferred by Bt, but unsuitable for Tv) or maize (unsuitable for both species) plants. There were no prominent effects of plant species switching on the amylase activity of the two whitefly species. The amylase activity of Bt was 1.49-1.66 folds higher than that of Tv when fed on tomato or when switched to different host species. There were no effects on the proteinase activity of Bt when switched to a different host species, but that of Tv decreased by 29.9-42.7%. The proteinase activity of Bt was 1.30 and 1.21 folds higher than that of Tv when switched to cabbage and cotton plants, respectively. There were no interspecific differences in proteinase activity when switched to maize plants. Bt amylase activity dynamics were expressed as activation then inhibition or inhibition then activation when switched to cabbage and maize plants; however, those of Tv were smooth. Amylase activity dynamics were similar for both species when switched to cotton. Although proteinase activity dynamics of Bt were expressed as activation then inhibition when switched to any of the three plant species tested, the activation period was longer when switched to maize plants. In the case of Tv, proteinase activity dynamics were similarly smooth regardless of which plant species switched to. Our results indicated that Bt was more adaptable to plant species switching than T. vaporariorum.

Key words: Bemisia tabaci biotype B, Trialeurodes vaporariorum, amylase, proteinase, dynamics, plant species switching, adaptability