Abstract
The silkworm Bombyx mori is a molecular genetic model for the Lepidoptera. Its odorant receptor genes have been described, and preliminary studies suggest that several are expressed specifically in the larval caterpillar stage. This study was undertaken to identify olfactory behaviors specific to the larvae. A two-choice leaf disk bioassay with naive neonate larvae was used to evaluate the attractiveness of three types of mulberry leaf (Morus alba): newly flushed leaves from branch tips, mature leaves, and mature leaves with feeding damage caused by conspecific larvae. Mature leaves with feeding damage were the most attractive, newly flushed leaves were moderately favored, and undamaged mature leaves were the least attractive. Volatile odors collected from whole mulberry leaves by using solid-phase microextraction fibers were analyzed by gas chromatography-mass spectrometry. The volatile profile of newly flushed leaves and mature leaves damaged by conspecific larvae was more complex compared to undamaged mature leaves. By comparing the volatile makeup of each leaf type, a list of 22 candidate odors responsible for attracting the neonate larvae was generated; α-farnesene was particularly notable as a herbivore-induced volatile. These odors will be used in future in vitro studies to determine whether they activate larval-specific odorant receptors.
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Acknowledgments
We thank the Hanks’ lab for the use of the GC-MS and technical advice, Annie Ray and Emerson Lacey for their help with designing experiments and running the GC/MS, and Art Zangerl for assisting with volatile identification. We also thank the two anonymous reviewers for helpful comments that improved the manuscript. This research was funded by USDA NRI grant #2006-03826.
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Supplementary Fig. 1
Volatile profile of filter paper exposed to mature mulberry leaves that were fed upon for 24 h by neonate silkworm larvae. One major peak (peak #C) representing α-farnesene was detected. Two minor peaks were identified as 6-methyl-5-hepten-2-one (peak A) and (Z)-3-hexenyl 2-methylbutanoate (peak B). Retention time (min) is labeled on the x-axis, relative abundance (×106) on the y-axis. (GIF 9 kb)
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Mooney, A.C., Robertson, H.M. & Wanner, K.W. Neonate Silkworm (Bombyx mori) Larvae Are Attracted to Mulberry (Morus alba) Leaves with Conspecific Feeding Damage. J Chem Ecol 35, 552–559 (2009). https://doi.org/10.1007/s10886-009-9639-z
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DOI: https://doi.org/10.1007/s10886-009-9639-z