Huang Jun, Zhang Peng-Jun, Zhang Juan, Lu Yao-Bin, Huang Fang, Li Ming-Jiang
Flower Research and Development Centre, Zhejiang Academy of Agricultural Sciences, Hangzhou 311202, P. R. China.
Environ Entomol. 2013 Oct;42(5):973-9. doi: 10.1603/EN12342. Epub 2013 Sep 16.
Herbivore injury has indirect effects on the growth and performance of host plants through photosynthetic suppression. It causes uncertain reduction in photosynthesis, which likely depends on the degree of infestation. Rapid light curves provide detailed information on the saturation characteristics of electron transport as well as the overall photosynthetic performance of a plant. We examined the effects of different intensities of infestation of the invasive mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae), on the relative chlorophyll content and rapid light curves of tomato Solanum lycopersicum L. leaves using a chlorophyll meter and chlorophyll fluorescence measurement system, respectively, under greenhouse conditions. After 38 d of P. solenopsis feeding, relative chlorophyll content of tomato plants with initial high of P. solenopsis was reduced by 57.3%. Light utilization efficiency (α) for the initial high-density treatment was reduced by 42.4%. However, no significant difference between initial low-density treatment and uninfested control was found. The values of the maximum electron transport rate and minimum saturating irradiance for initial high-density treatment were reduced by 82.0 and 69.7%, respectively, whereas the corresponding values for low-density treatment were reduced by 55.9 and 58.1%, respectively. These data indicated that changes were induced by P. solenopsis feeding in the relative chlorophyll content and chlorophyll fluorescence of infested tomato plants. The results indicating that low initial infestation by P. solenopsis caused no change in relative leaf chlorophyll content or light utilization efficiency could have been because the plants rapidly adapted to P. solenopsis feeding or because of compensatory photosynthesis.
植食性动物的取食会通过抑制光合作用对寄主植物的生长和性能产生间接影响。它会导致光合作用出现不确定的降低，这可能取决于侵染程度。快速光曲线提供了有关电子传递饱和特性以及植物整体光合性能的详细信息。我们在温室条件下，分别使用叶绿素仪和叶绿素荧光测量系统，研究了入侵性粉蚧——扶桑绵粉蚧（半翅目：粉蚧科）不同侵染强度对番茄（茄属番茄）叶片相对叶绿素含量和快速光曲线的影响。在扶桑绵粉蚧取食38天后，初始侵染程度高的番茄植株的相对叶绿素含量降低了57.3%。初始高密度处理的光利用效率（α）降低了42.4%。然而，初始低密度处理与未侵染对照之间未发现显著差异。初始高密度处理的最大电子传递速率和最小饱和辐照度值分别降低了82.0%和69.7%，而低密度处理的相应值分别降低了55.9%和58.1%。这些数据表明，扶桑绵粉蚧取食诱导了被侵染番茄植株相对叶绿素含量和叶绿素荧光的变化。结果表明，扶桑绵粉蚧初始侵染程度低时，叶片相对叶绿素含量或光利用效率没有变化，这可能是因为植物迅速适应了扶桑绵粉蚧的取食，或者是由于补偿性光合作用。
