Attractant

An attractant is a synomone.

Synomone

An interspecific semiochemical that is beneficial to both interacting organisms, the emitter and receiver, e.g. floral synomone of certain Bulbophyllum species (Orchidaceae) attracts fruit fly males (Tephritidae: Diptera) as pollinators. In this true mutualistic inter-relationship, both organisms gain benefits in their respective sexual reproduction - i.e. orchid flowers are pollinated and the Dacini fruit fly males are rewarded with a sex pheromone precursor or booster; and the floral synomones, also act as rewards to pollinators, are in the form of phenylpropanoids (e.g. methyl eugenol)[1] and phenylbutanoids (e.g. raspberry ketone[2] and zingerone[3]).

References
  1. a) Tan, K.H., R. Nishida and Y.C. Toong (2002) Bulbophyllum cheiri's floral synomone lures fruit flies to perform pollination. Journal of Chemical Ecology 28:1161-1172.
    b) Nishida, R., K.H. Tan, S.L. Wee, A.K.W. Hee and Toong, Y. C. (2004) Phenylpropanoids in the fragrance of the fruit fly orchid, Bulbophyllum cheiri, and their relationship to the pollinator, Bactrocera papayae. Biochemical Systematics & Ecology. 32: 245-252.
    c) Tan, K.H., L.T. Tan, and R. Nishida (2006) Floral phenylpropanoid cocktail and architecture of Bulbophyllum vinaceum orchid in attracting fruit flies for pollination. Journal of Chemical Ecology 32: 2429-2441.
  2. Tan, K.H. and R. Nishida (2005) Synomone or Kairomone? - Bulbophyllum apertum (Orchidaceae) flower releases raspberry ketone to attract Bactrocera fruit flies. Journal of Chemical Ecology. 31(3): 509-519.
  3. a) Tan, K.H. and R. Nishida (2000) Mutual reproductive benefits between a wild orchid, Bulbophyllum patens, and Bactrocera fruit flies via a floral synomone. Journal of Chemical Ecology 26: 533-546.
    b) Tan, K.H. and R. Nishida (2007) Zingerone in the floral synomone of Bulbophyllum baileyi (Orchidaceae) attracts Bactrocera fruit flies during pollination. Biochemical Systmatics and Ecology 35: 334-341.
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