title: The green peach aphid Myzus persicae perform better on pre-infested Chinese cabbage Brassica pekinensis by enhancing host plant nutritional quality.
abstract: The green peach aphid, Myzus persicae Sulzer, is a notorious pest on vegetables, which often aggregates in high densities on crop leaves. In this study, we investigated whether M. persicae could suppress the resistance level of Chinese cabbage Brassica pekinensis. M. persicae performed better in terms of weight gain (~33% increase) and population growth (~110% increase) when feeding on previously infested (pre-infested) Chinese cabbage compared with those on non-infested plants. However, when given a choice, 64% of the aphids preferred to settle on non-infested leaves, while 29% of aphids chose pre-infested leaves that had a 2.9 times higher concentration of glucosinolates. Aphid feeding significantly enhanced the amino acid:sugar ratio of phloem sap and the absolute amino acid concentration in plant leaves. Aphid infestation significantly increased the expression levels of salicylic acid (SA) marker genes, while it had marginal effects on the expression of jasmonate marker genes. Exogenously applied SA or methyl jasmonate had no significant effects on M. persicae performance, although these chemicals increased glucosinolates concentration in plant leaves. M. persicae infestation increase amino acid:sugar ratio and activate plant defenses, but aphid performed better on pre-infested plants, suggesting that both nutrition and toxics should be considered in insect-plant interaction.
authors.affiliation: State Key Laboratory for Crop Stress Biology in Arid Areas, Yangling, Shaanxi, 712100, China.|Key Laboratory of Crop Pest Management on the Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi, 712100, China.
authors.forename: He-He
authors.initials: HH
authors.lastname: Cao
authors.affiliation: Innovation Experimental College, Northwest A&F University, Yangling, Shaanxi, 712100, China.
authors.forename: Hui-Ru
authors.initials: HR
authors.lastname: Liu
authors.affiliation: State Key Laboratory for Crop Stress Biology in Arid Areas, Yangling, Shaanxi, 712100, China.|Key Laboratory of Crop Pest Management on the Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi, 712100, China.
authors.forename: Zhan-Feng
authors.initials: ZF
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Crop Stress Biology in Arid Areas, Yangling, Shaanxi, 712100, China.|Key Laboratory of Crop Pest Management on the Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi, 712100, China.
authors.forename: Tong-Xian
authors.initials: TX
authors.lastname: Liu
mesh_terms: D000596:Amino Acids / Q000096:biosynthesis; D000818:Animals; D001042:Aphids / Q000187:drug effects / Q000502:physiology*; D001937:Brassica / Q000187:drug effects / Q000235:genetics / Q000276:immunology* / Q000469:parasitology; D003517:Cyclopentanes / Q000378:metabolism / Q000494:pharmacology; D060467:Disease Resistance / Q000235:genetics / Q000276:immunology; D005247:Feeding Behavior / Q000187:drug effects / Q000502:physiology; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant / Q000276:immunology*; D005961:Glucosinolates / Q000096:biosynthesis; D006790:Host-Parasite Interactions; D054883:Oxylipins / Q000378:metabolism / Q000494:pharmacology; D052585:Phloem / Q000187:drug effects / Q000235:genetics / Q000276:immunology* / Q000469:parasitology; D010935:Plant Diseases / Q000235:genetics / Q000276:immunology* / Q000469:parasitology; D018515:Plant Leaves / Q000235:genetics / Q000276:immunology* / Q000469:parasitology; D000068239:Prunus persica / Q000235:genetics / Q000276:immunology / Q000469:parasitology; D020156:Salicylic Acid / Q000378:metabolism / Q000494:pharmacology
chemical_list: D000596:Amino Acids; D003517:Cyclopentanes; D005961:Glucosinolates; D054883:Oxylipins; C011006:jasmonic acid; D020156:Salicylic Acid