The making of a pest: Insights from the evolution of chemosensory receptor families in a pestiferous and invasive fly, Drosophila suzukii

Table 4 Ligands and chemosensory organs, based on studies in D. melanogaster, are shown for lost and expanded lineages, and genes with signatures of positive selection (a = antenna, p = palp, b = basiconic, t = trichoid, LDO = larval dorsal organ)

	Gene	Species	Ligands	Expression
Losses	Or33cP	bia	Ethyl acetate, Cyclohexanone, Fenchone [100]	pb2A [76, 100]
	Or74aP	suz	E,E-2-4-nonadienal [101]	LDO [86]
	Or85aP	suz	Ethyl 3-hydroxybutyrate [87]	ab2B [76]
	Or98bP	suz	unknown	ab6B*[76]
Expansions	Or23a	suz, tak	Isoamyl acetate [83]	ai2B [76]
	Or67a	suz, bia, tak	Ethyl benzoate, Methyl benzoate [83]	ab10B [76]
	Gr22a-f	tak	bitter compounds [102]	Labellum [103], larvae [104] legs [105]
	Gr36a-c	suz, bia, tak	bitter compounds [102]	Larvae [104], legs [105]
	Gr59ab	suz, bia, tak	bitter compounds [102]	Larvae [104], legs [105]
	Gr59cd	suz, bia, tak	bitter compounds [102]	Larvae n [104], legs [105]
	Gr93a	suz	bitter compounds [102]	unknown
	Gr98b	suz	bitter compounds [102]	unknown
	Gr98d	suz	bitter compounds [102]	Legs [105]
Positive sel.	Or2a	suz, bia, tak	Ethyl 3-hydroxybutyrate, Isoamyl acetate [83]	ai3A [76]
	Or9a	tak	2-acetoin, 2,3-butanediol [84]	ab8B [76]
	Gr5a	suz, bia, tak	Trehalose [93, 94]	Labellum [103], legs [105]
	Gr58a	suz, bia	unknown	unknown
	Gr97a	suz, bia, tak	unknown	Larvae [104]

ISSN: 1471-2164