悬铃木叶片对悬铃木方翅网蝽为害的生理响应

Leaf physiological responses in the London plane tree(Platanus×acerifolia)(Platanaceae)to injury by the sycamore lace bug,Corythucha ciliata(Hemiptera:Tingidae)

为了认识近年来入侵中国的外来害虫悬铃木方翅网蝽Corythucha ciliata刺吸为害对寄主的影响,将室内饲养虫源接入野外悬铃木Platanus×acerifolia叶片上,利用光合作用仪和比色法,测定了不同受害级别下悬铃木叶片几种生理性状的变化。结果表明:随着受害级别的增高,叶片光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)总体呈下降趋势。叶片不同受害级别与胞间CO2浓度(Ci)呈正相关(P<0.01)。悬铃木方翅网蝽刺吸悬铃木叶片组织后,叶片叶绿素a、b和类胡萝卜素都较对照降低,且随着被害级别的增高,降低程度逐渐增大。叶面积受害级别与叶绿体色素之间呈显著的负相关关系(P<0.01)。随着叶片受害级别的增大,可溶性糖含量呈下降趋势,而游离脯氨酸含量的变化则无规律性。这些结果说明,悬铃木方翅网蝽的刺吸为害能造成寄主植物光合作用的减弱及叶片其他生理生化指标变化。

The sycamore lace bug,Corythucha ciliata,is a newly found invasive insect in China.To examine the effects of piercing-sucking by C.ciliata on its host plants,we measured several physiological and biochemical traits of the London plane tree（Platanus×acerifolia）leaves injured by the bug using photosynthetic apparatus and colorimetric analysis.The results showed that with increasing leaf injury by the bug,the photosynthetic rate（Pn）,stomatal conductance（Gs）,transpiration rate（Tr）in P.×acerifolia generally decreased.Positive relation existed between leaf injury and intercellular CO2 concentration（Ci）（P 0.01）.After the leaf tissue of P.×acerifolia was pierced and sucked by C.ciliata adults,the chlorophyll a,b and carotenoid contents decreased compared with those of the control.There was a negative relation between leaf injury and chloroplast pigment content（P 0.01）.With increasing leaf injury,soluble sugar content decreased,but no consistent pattern of free proline content in leaves was observed.The results suggest that photosynthesis is weakened and some other physiological and biochemical parameters are changed in P.×acerifolia leaves injured by C.ciliata.