Abstract
AbstractIn this study, floral color, scent composition and emission rate, nectar property, pollinators, and breeding system of dimorphicBuddleja delavayiGagnep. were investigated. Flower color ofB. delavayiwas determined using a standard color chart and spectrophotometer, and two distinct color polymorphisms were observed having purple or white flowers. Floral scents ofB. delavayiwere collected using dynamic headspace adsorption and identified with coupled gas chromatography and mass spectrometry. In total, 28 compounds were identified from the flowers ofB. delavayi. The identified scents were divided into three chemical classes based on their biosynthetic origin: terpenes, fatty acid derivatives, and benzenoids. The scent profiles in all individuals were dominated by a few components, such as lilac aldehyde and alcohol, 4‐oxoisophorone, benaldehyde, and oxoisophorone oxide. Floral scent composition (benzenoids and terpenes) showed a significant difference between white and purple flower morphs. Flower color–flower scent associations inB. delavayiwere identified with two distinct scent profiles in the two color phenotypes. The studies of other floral characteristics (nectar, floral visitors, breeding system, and fruit set) indicated that floral scent emission rate, nectar volume, visitor visitation frequency, and natural fruit set were not significantly different between the two flower color morphs. Bagging experiments revealed that seed production ofB. delavayiis dependent mainly on honeybeeApis cerana. Lastly, this study implies that dimorphic floral color inB. delavayimay have been maintained by floral visitors and nectar guide color.
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