Earth and Life Institute, Ecology and Biodiversity, UCLouvain, Louvain-la-Neuve, Belgium.
Faculté des Sciences Agronomiques, Université Catholique de Bukavu, Bukavu, Democratic Republic of the Congo.
J Econ Entomol. 2023 Oct 10;116(5):1481-1489. doi: 10.1093/jee/toad130.
Viral diseases can change plant metabolism, with potential impacts on the quality of the plant's food supply for insect pests, including virus vectors. The banana aphid, Pentalonia nigronervosa Coquerel, is the vector of the Banana bunchy top virus (BBTV), the causal agent of Banana bunchy top disease (BBTD), the most devastating viral disease of bananas in the world. The effect of BBTV on the life-history traits and population dynamics of P. nigronervosa remains poorly understood. We therefore studied the survival rate, longevity, daily fecundity per aphid, tibia length, population growth, and winged morph production of a P. nigronervosa clone grown on healthy or infected, dessert, or plantain banana plants. We found that daily fecundity was higher on infected banana than on healthy banana plants (plantain and dessert), and on plantain than on dessert banana plants (healthy and infected). Survival and longevity were lower on infected dessert bananas than on other types of bananas. In addition, virus infection resulted in a decrease in aphid hind tibia length on both plant genotypes. The survival and fecundity table revealed that the aphid net reproduction rate (Ro) was highest on plantains (especially infected plantain), and the intrinsic growth rate (r) was highest on infected plants. Finally, the increase of aphids and alate production was faster first on infected plantain, then on healthy plantain, and lower on dessert banana (infected and uninfected). Our results reinforce the idea of indirect and plant genotype-dependent manipulation of P. nigronervosa by the BBTV.
病毒病会改变植物的新陈代谢，对包括病毒载体在内的害虫的植物食物供应质量产生潜在影响。香蕉蚜，Pentalonia nigronervosa Coquerel，是香蕉束顶病毒（BBTV）的载体，是香蕉束顶病（BBTD）的致病因子，是世界上最具破坏性的香蕉病毒性疾病。BBTV 对 P. nigronervosa 生活史特征和种群动态的影响仍知之甚少。因此，我们研究了在健康或感染的、甜点或大蕉香蕉植株上生长的 P. nigronervosa 克隆的存活率、寿命、每头蚜虫的日繁殖力、胫骨长度、种群增长和有翅形态的产生。我们发现，感染香蕉上的蚜虫日繁殖力高于健康香蕉植株（大蕉和甜点），而感染香蕉上的蚜虫日繁殖力高于甜点香蕉植株（健康和感染）。感染的甜点香蕉上的存活率和寿命低于其他类型的香蕉。此外，病毒感染导致两种植物基因型上的蚜虫后胫骨长度下降。生存和繁殖力表表明，蚜虫的净生殖率（Ro）在大蕉上最高（特别是感染的大蕉），而内在增长率（r）在感染的植株上最高。最后，蚜虫和有翅成虫的增加首先在感染的大蕉上更快，然后在健康的大蕉上更快，而在甜点香蕉（感染和未感染）上较慢。我们的研究结果强化了 BBTV 对 P. nigronervosa 的间接和植物基因型依赖操纵的观点。
