Monday, December 11, 2006 - 9:11 AM
0320

Associations between ovary size, vitellogenin transcription, and sucrose responsiveness in honey bee workers

Jennifer Tsuruda, jmtsuruda@ucdavis.edu1, Gro V. Amdam, gro.amdam@asu.edu2, and Robert Page, robert.page@asu.edu2. (1) University of California - Davis, Department of Entomology, 1 Shields Ave, Davis, CA, (2) Arizona State University, School of Life Sciences, Box 4501, Tempe, AZ

In honey bees, pollen-hoarding and -foraging behavior has been associated with the age of onset of foraging, locomotor activity at emergence, learning performance, and sensory perception. Recent studies have investigated reproductive traits in functionally sterile female workers. This work has revealed a reproductive component of the genetic network that controls foraging behavior. Here, we asked if there are associations between ovary size (the number of ovarioles), vitellogenin transcription level, and responsiveness to sucrose in young workers. Individual bees were tested for sucrose responsiveness with the proboscis extension response (PER) assay, dissected for ovariole counts, and processed for vitellogenin transcription level using real-time RT-PCR. We found that bees that were more responsive to sucrose had a higher number of ovarioles than bees that were less responsive. Examination of vitellogenin transcription levels of these two groups revealed that the group of bees that was higher in sucrose responsiveness and ovariole number also had a higher level of vitellogenin mRNA transcription than the group of bees that was lower in responsiveness and ovariole number. We suggest that sensory perception and reproductive physiology are linked within the pollen-hoarding syndrome.


Species 1: Hymenoptera Apidae Apis mellifera (honey bee)