B型烟粉虱对番茄不同品种光合特征和防御酶活性的影响

 【目的】从植物生理代谢角度评价B型烟粉虱对番茄不同品种的选择性差异。【方法】在人工气候室内，通过选择性试验比较研究B型烟粉虱在9个番茄品种上的落虫量以及番茄植株受B型烟粉虱侵害后光合参数（Fv/Fm、Fv/Fo、Gs、Pn、Ci）和防御酶（POD、CAT、PPO、LOX）活性变化。【结果】B型烟粉虱在9种番茄品种上的落虫量大小依次为黄圣果（HSG）＞浙杂205（ZA 205）＞浙杂203（ZA 203）＞浙杂206（ZA 206）=浙杂809（ZA 809）=合作903（HZ 903）=粉娘（FN）＞红圣女（HSN）=浙粉202（ZF 202）。落虫量较多的HSG和ZA 205的光合参数值及防御酶活性变化显著，而落虫量较少的HSN和ZF 202的光合参数值及防御酶活性没有显著变化，表明HSG和ZA 205受到B型烟粉虱取食胁迫,而HSN和ZF 202没有受到B型烟粉虱的取食胁迫。进一步的分析表明，9 h 后番茄各品种上的光合参数值的变化与落虫量，及光抑制特征参数Fv/Fm变化量与防御酶活性变化量均呈极显著正相关。【结论】植物的光合参数值和防御酶活性变化能很好反映出B型烟粉虱对不同番茄品种的选择性，B型烟粉虱对HSG和ZA 205的选择性最强，对HSN和ZF 202最弱，并且落虫量与植物受B型烟粉虱胁迫程度呈正相关性。

Effect of Bemisia tabaci (Gennadius) B-Biotype on Photosynthetic Characteristics and Activity of Defense Enzyme in Different Varieties of Tomato

【Objective】The objective of this study is to evaluate the selection of Bemisia tabaci B-biotype to different tomato varieties in the sight of physiological metabolism. 【Method】 An experiment was carried out at the artificial climate condition. The changes of the number of B. tabaci B-biotype, the value of photosynthetic parameter (i.e., Fv/Fm, Fv/Fo, Gs, Pn, Ci) and the defense enzyme (POD, CAT, PPO, LOX) activity on 9 species of tomato plant were comparatively studied by selection testing, respectively.【Result】 After sorting the 9 species of tomato plant by the number of the B. tabaci B-biotype, the descending order was arranged to be Huangshengguo (HSG)＞Zheza 205 (ZA 205)＞Zheza 203 (ZA 203)＞Zheza 206 (ZA 206) = Zheza 809 (ZA 809) = Hezuo 903 (HZ 903) = Fenniang (FN)＞Zhefen 202 (ZF 202) = Hongshengnv (HSN). Significant changes of the value of the photosynthetic parameter and the activity of the defense enzyme were observed in the plants HSG and ZA 205, but not in the plants ZF 202 and HSN, respectively. It indicated that the plants HSG and ZA 205 were stressed by the B. tabaci B-biotype feeding but not the plants HSN and ZF 202. As a result, two kinds of positive and significant correlations, i.e., the value change of the photosynthetic parameter and the number of the B. tabaci B-biotype, and the value change of light inhibition parameter (i.e., Fv/Fm) and the activity change of defense enzyme, were observed after 9 hours of selection testing. 【Conclusion】 Selection diversity of B. tabaci B-biotype to different tomato varieties could be reflected by the value changes of photosynthetic parameter and the activity change of defense enzyme. The B. tabaci B-biotype exhibited the highest selection to the plants HSG and ZA 205 and lowest selection to the plants HSN and ZF 202. The number of B. tabaci B-biotype showed a positive significant correlation with the degree of stress of B. tabaci on tomato plant.