Genomic dissection of an extended phenotype: Oak galling by a cynipid gall wasp

Autoři: Jack Hearn aff001;  Mark Blaxter aff002;  Karsten Schönrogge aff003;  José-Luis Nieves-Aldrey aff004;  Juli Pujade-Villar aff005;  Elisabeth Huguet aff006;  Jean-Michel Drezen aff006;  Joseph D. Shorthouse aff007;  Graham N. Stone aff002
Působiště autorů: Vector Biology Department, Liverpool School of Tropical Medicine, Liverpool, United Kingdom aff001;  Institute of Evolutionary Biology, University of Edinburgh, King’s Buildings, Edinburgh, United Kingdom aff002;  Centre for Ecology and Hydrology, Wallingford, United Kingdom aff003;  Departamento de Biodiversidad y Biología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain aff004;  Departament de Biologia Animal, Universitat de Barcelona, Spain aff005;  UMR 7261 CNRS, Institut de Recherche sur la Biologie de l’Insecte, Faculté des Sciences et Techniques, Université de Tours, France aff006;  Department of Biology, Laurentian University, Sudbury, Ontario, Canada aff007
Vyšlo v časopise: Genomic dissection of an extended phenotype: Oak galling by a cynipid gall wasp. PLoS Genet 15(11): e32767. doi:10.1371/journal.pgen.1008398
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008398


Galls are plant tissues whose development is induced by another organism for the inducer's benefit. 30,000 arthropod species induce galls, and in most cases the inducing effectors and target plant systems are unknown. Cynipid gall wasps are a speciose monophyletic radiation that induce structurally complex galls on oaks and other plants. We used a model system comprising the gall wasp Biorhiza pallida and the oak Quercus robur to characterise inducer and host plant gene expression at defined stages through the development of galled and ungalled plant tissues, and tested alternative hypotheses for the origin and type of galling effectors and plant metabolic pathways involved. Oak gene expression patterns diverged markedly during development of galled and normal buds. Young galls showed elevated expression of oak genes similar to legume root nodule Nod factor-induced early nodulin (ENOD) genes and developmental parallels with oak buds. In contrast, mature galls showed substantially different patterns of gene expression to mature leaves. While most oak transcripts could be functionally annotated, many gall wasp transcripts of interest were novel. We found no evidence in the gall wasp for involvement of third-party symbionts in gall induction, for effector delivery using virus-like-particles, or for gallwasp expression of genes coding for plant hormones. Many differentially and highly expressed genes in young larvae encoded secretory peptides, which we hypothesise are effector proteins exported to plant tissues. Specifically, we propose that host arabinogalactan proteins and gall wasp chitinases interact in young galls to generate a somatic embryogenesis-like process in oak tissues surrounding the gall wasp larvae. Gall wasp larvae also expressed genes encoding multiple plant cell wall degrading enzymes (PCWDEs). These have functional orthologues in other gall inducing cynipids but not in figitid parasitoid sister groups, suggesting that they may be evolutionary innovations associated with cynipid gall induction.

Klíčová slova:

Buds – Gene expression – Insects – Invertebrate genomics – Larvae – Transcriptome analysis – Viral gene expression – Oaks


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