ECOPHYSIOLOGICAL ANALYSIS OF Eucalyptus camaldulensis (DEHNH) SUBMITTED TO ATTACK FROM Thaumastocoris peregrinus (CARPINTERO & DELLAPE)

ABSTRACT Works correlating the effect of a bronze bug attack on ecophysiological aspects of eucalyptus can be used in selection programs for resistant genetic materials. The objective of this study was to evaluate the injuries caused by Thaumastocoris peregrinus (Carpintero & Dellape) through the ecophysiological analysis of Eucalyptus camaldulensis (Dehnh). The experiment was conducted in a completely randomized design, with two groups of plants, infested and non-infested, kept in a room at 25 ± 2 °C, relative humidity 60 ± 2% and a photoperiod of 12 hours. For 26 days, every 48 hours, the chlorophyll a fluorescence, using the electron transport rate (ETR) and the potential quantum efficiency (Fv/Fm), was measured, in addition to the leaf chlorophyll content of the plants. The variables observed were analyzed in relation to treatments and times using a mixed linear model, with plants and leaves being random effects. Plants protected from insect attack showed better results over the experimental period. However, the attack from the bronze bug negatively affected all the ecophysiological variables evaluated in E. camaldulensis, indicating a possible compromise of the photosynthetic apparatus of the plants.

摘要 针对俗称青铜色蝽（bronze bug）的桉扁翅盲蝽（Thaumastocoris peregrinus Carpintero & Dellape）侵害对桉树生理生态特性影响的相关研究，可应用于抗性遗传材料的选育项目。本研究旨在通过对赤桉（Eucalyptus camaldulensis Dehnh）的生理生态分析，评估该虫害造成的为害情况。试验采用完全随机设计，设置侵染组与非侵染组两组植株，将其置于温度为25±2℃、相对湿度60±2%、光周期12小时的培养室内。在为期26天的试验周期内，每48小时测定一次植株的叶绿素a荧光参数，包括电子传递速率（electron transport rate, ETR）与潜在量子效率（potential quantum efficiency, Fv/Fm），同时测定植株的叶片叶绿素含量。采用混合线性模型（mixed linear model）对不同处理与时间下的观测变量进行分析，以植株与叶片作为随机效应。试验全程中，未遭受虫害的植株表现更优。然而，青铜色蝽的侵害对赤桉的所有被测生理生态变量均产生了负面影响，表明该虫害可能对植株的光合机构造成损害。