title: Systemic response to aphid infestation by Myzus persicae in the phloem of Apium graveolens.
abstract: Little is known about the molecular processes involved in the phloem response to aphid feeding. We investigated molecular responses to aphid feeding on celery (Apium graveolenscv. Dulce) plants infested with the aphid Myzus persicae, as a means of identifying changes in phloem function. We used celery as our model species as it is easy to separate the phloem from the surrounding tissues in the petioles of mature leaves of this species. We generated a total of 1187 expressed sequence tags (ESTs), corresponding to 891 non-redundant genes. We analysed these ESTs in silico after cDNA macroarray hybridisation. Aphid feeding led to significant increase in RNA accumulation for 126 different genes. Different patterns of deregulation were observed, including transitory or stable induction 3 or 7 days after infestation. The genes affected belonged to various functional categories and were induced systemically in the phloem after infestation. In particular, genes involved in cell wall modification, water transport, vitamin biosynthesis, photosynthesis, carbon assimilation and nitrogen and carbon mobilisation were up-regulated in the phloem. Further analysis of the response in the phloem or xylem suggested that a component of the response was developed more specifically in the phloem. However, this component was different from the stress responses in the phloem driven by pathogen infection. Our results indicate that the phloem is actively involved in multiple adjustments, recruiting metabolic pathways and in structural changes far from aphid feeding sites. However, they also suggest that the phloem displays specific mechanisms that may not be induced in other tissues.
authors.affiliation: Laboratory of Cell Biology, INRA, Versailles 78026, France.
authors.forename: Fanchon
authors.initials: F
authors.lastname: Divol
authors.forename: Françoise
authors.initials: F
authors.lastname: Vilaine
authors.forename: Sandra
authors.initials: S
authors.lastname: Thibivilliers
authors.forename: Joëlle
authors.initials: J
authors.lastname: Amselem
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Palauqui
authors.forename: Chantal
authors.initials: C
authors.lastname: Kusiak
authors.forename: Sylvie
authors.initials: S
authors.lastname: Dinant
mesh_terms: D000818:Animals; D001042:Aphids / Q000254:growth & development*; D000077102:Apium / Q000235:genetics* / Q000469:parasitology; D016000:Cluster Analysis; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D020224:Expressed Sequence Tags; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000235:genetics; D008969:Molecular Sequence Data; D020411:Oligonucleotide Array Sequence Analysis; D010935:Plant Diseases / Q000235:genetics / Q000469:parasitology; D018514:Plant Structures / Q000235:genetics* / Q000469:parasitology; D017422:Sequence Analysis, DNA; D014158:Transcription, Genetic / Q000235:genetics
chemical_list: D018076:DNA, Complementary