A sucrose-specific receptor in Bemisia tabaci and its putative role in phloem feeding

Ofer Aidlin Harari*, Amir Dekel, Dor Wintraube, Yuri Vainer, Rita Mozes-Koch, Esther Yakir, Osnat Malka, Shai Morin, Jonathan D. Bohbot*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In insects, specialized feeding on the phloem sap (containing mainly the sugar sucrose) has evolved only in some hemipteran lineages. This feeding behavior requires an ability to locate feeding sites buried deeply within the plant tissue. To determine the molecular mechanism involved, we hypothesized that the phloem-feeding whitefly Bemisia tabaci relies on gustatory receptor (GR)-mediated sugar sensing. We first conducted choice assays, which indicated that B. tabaci adults consistently choose diets containing higher sucrose concentrations. Next, we identified four GR genes in the B. tabaci genome. One of them, BtabGR1, displayed significant sucrose specificity when expressed in Xenopus oocytes. Silencing of BtabGR1 significantly interfered with the ability of B. tabaci adults to discriminate between non-phloem and phloem concentrations of sucrose. These findings suggest that in phloem feeders, sugar sensing by sugar receptors might allow tracking an increasing gradient of sucrose concentrations in the leaf, leading eventually to the location of the feeding site.

Original languageAmerican English
Article number106752
JournaliScience
Volume26
Issue number5
DOIs
StatePublished - 19 May 2023

Bibliographical note

Publisher Copyright:
© 2023 The Author(s)

Keywords

  • Biological sciences
  • Molecular biology
  • Molecular mechanism of behavior

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