Cornbined Gas Chromatography-Electroantennogram Characterization of Alfalfa Floral Volatiles Recognized by Honey Bees (Hymenoptera: Apidae)

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Abstract
This study was designed to investigate antennal response of honey bees, Apis mellifera L., to alfalfa /loral volatiles and to assess among- and within-hive variation in average antennal response to these Cornpounds. Ten of the principal ( Medicago sativa L.) alfalfa floral volatiles were analyzed for honey bee antennal response using a Cornbined gas chromatography-electroantennal detector system. All 10 alfalfa floral volatiles elicited antennal responses, and significant differences were observed in average honey bee antennal response to these 10 Cornpounds. Linaloöl and methyl salicylate elicited “sticky” antennal signals (slow recovery toward baseline physio-electrical output). This “sticky” response may suggest a biologically active role for these two Cornpounds. Support for a biologically active role for linaloöl and cis -3-hexenyl acetate Cornes from the chemical and structural similarity between these two Cornpounds and two honey bee pheromones, geraniol (nasonov) and n-hexyl acetate (alarm), respectively. Selection for increased emanation of linaloöl and methyl salicylate, and decreased emanation of cis -3-hexenyl acetate, is suggested as a possible method for increasing the attractiveness of alfalfa to honey bees. Finally, significant differences were demonstrated in both among- and within-hive average antennal response to most of the volatile Cornpounds. Based on the results of this study and those of other investigators, we hypothesize that host-pollinator interrelationships can be strengthened by directed selection in both honey bees and alfalfa.

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