UPRES EA 1207, Laboratoire de Biologie des Ligneux et des Grandes Cultures, Université d'Orléans, Rue de Chartres, BP 6759, FR-45067 Orleans Cedex, France.
J Econ Entomol. 2013 Feb;106(1):473-81. doi: 10.1603/ec12127.
The woolly poplar aphid, Phloeomyzus passerinii (Signoret) (Hemiptera: Aphididae), is a major pest of poplar plantations in the Mediterranean basin and the Near East. Aphids colonize poplar trunks and feed upon the cortical parenchyma. Despite the economic importance of poplar, little is known about the mechanisms involved in poplar resistance to this pest. However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii. This study has investigated the type of poplar resistance (antibiosis or antixenosis) by assessing aphid settlement, physiology (survival, development, and reproduction), and stylet penetration behavior (electrical penetration graph) on three P. x canadensis genotypes; '1214' (susceptible), 'Brenta' (resistant), and '145/51' (intermediate). Because settlement was reduced, the highly resistant genotype Brenta exhibited surface antixenosis. In addition, nymphal survival was null on Brenta, and twice less adult aphid initiated a sustained intracellular phase in the cortical parenchyma of that genotype compared with the other two genotypes. Thus, Brenta also showed parenchyma-located antixenosis coupled with antibiosis characteristic. In contrast, P. passerinii had no difficulty to initiate a sustained ingestion in the cortical parenchyma of the intermediate genotype 145/51, but decreased fecundity and lower intrinsic rate of natural increase were clear expressions of antibiosis.
杨绵蚜，Phloeomyzus passerinii (Signoret)（半翅目：蚜科），是地中海盆地和近东地区杨属人工林的主要害虫。蚜虫在杨树树干上定殖，并以皮质薄壁组织为食。尽管杨树具有重要的经济意义，但对其抵御这种害虫的机制知之甚少。然而，杨属 Populus x canadensis Moench 基因型对 P. passerinii 表现出不同程度的抗性。本研究通过评估杨绵蚜在三个 P. x canadensis 基因型（‘1214’（易感）、‘Brenta’（抗性）和‘145/51’（中间）上的定居、生理学（存活、发育和繁殖）和刺吸行为（电穿透图），研究了杨树的抗性类型（抗生性或抗生性）。由于定居减少，高度抗性基因型 Brenta 表现出表面抗生性。此外，在 Brenta 上，若虫的存活率为零，与其他两个基因型相比，在该基因型的皮质薄壁组织中，开始持续细胞内阶段的成虫蚜虫数量减少了两倍。因此，Brenta 还表现出与抗生性相关的皮质薄壁组织抗生性。相比之下，杨绵蚜在中间基因型 145/51 的皮质薄壁组织中开始持续摄入没有困难，但繁殖力下降和内在自然增长率降低明显表现出抗生性。
