An immuno-suppressive aphid saliva protein is delivered into the cytosol of plant mesophyll cells during feeding

Mugford, S. T., Barclay, E., Drurey, C. , Findlay, K. C. and Hogengout, S. A. (2016) An immuno-suppressive aphid saliva protein is delivered into the cytosol of plant mesophyll cells during feeding. Molecular Plant-Microbe Interactions, 29(11), pp. 854-861. (doi: 10.1094/mpmi-08-16-0168-r) (PMID:27831211)

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Herbivore selection of plant hosts and plant responses to insect colonization have been subjects of intense investigations. A growing body of evidence suggests that, for successful colonization to occur, (effector/virulence) proteins in insect saliva must modulate plant defense responses to the benefit of the insect. A range of insect saliva proteins that modulate plant defense responses have been identified, but there is no direct evidence that these proteins are delivered into specific plant tissues and enter plant cells. Aphids and other sap-sucking insects of the order Hemiptera use their specialized mouthparts (stylets) to probe plant mesophyll cells until they reach the phloem cells for long-term feeding. Here, we show, by immunogold-labeling of ultrathin sections of aphid feeding sites, that an immuno-suppressive aphid effector localizes in the cytoplasm of mesophyll cells near aphid stylets but not in cells further away from aphid feeding sites. In contrast, another aphid effector protein localizes in the sheaths composed of gelling saliva that surround the aphid stylets. Thus, insects deliver effectors directly into plant tissue. Moreover, different aphid effectors locate extracellularly in the sheath saliva or are introduced into the cytoplasm of plant cells.

Item Type:Articles
Additional Information:The authors thank the Biotechnology and Biological Sciences Research Council for funding (BB/J0045531/1).
Glasgow Author(s) Enlighten ID:Drurey, Claire
Authors: Mugford, S. T., Barclay, E., Drurey, C., Findlay, K. C., and Hogengout, S. A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Molecular Plant-Microbe Interactions
Publisher:American Phytopathological Society
ISSN (Online):1943-7706
Published Online:10 November 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Molecular Plant-Microbe Interactions 29(11): 854-861
Publisher Policy:Reproduced under a Creative Commons License

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