Abstract

Flowers have evolved complex olfactory and visual displays to attract animals for pollination. Many pollinator insects show high specificity to flower volatiles (Dodson et al. 1969; Williams and Whitten 1983; Pham-Delegue et al. 1986, 1989; Borg-Karlson 1990), and variations in their chemical composition could lead to reproductive isolation and speciation in plants. Since the pioneer studies of flower fragrance chemistry versus pollinators carried out on orchids (Kullenberg 1961; Dodson et al. 1969; Hills et al. 1972; Kullenberg and Bergstrom 1976; Bergstrom 1978), there has been a growing interest in the biological significance and systematic value of flower volatiles in diverse plant groups (e.g., Thien et al. 1975, 1985; Nilsson 1978; Gregg 1983; Williams 1983; Williams and Whitten 1983; Borg-Karlson and Groth 1986; Bergstrom 1987; Groth et al. 1987; Robacker et al. 1988; Pham-Delegue et al. 1989; Borg-Karlson 1990; Dobson et al. 1990).

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