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PLoS One

Title:		Relative role of flower color and scent on pollinator attraction: experimental tests using F1 and F2 hybrids of daylily and nightlily
Author(s):		Hirota SK; Nitta K; Kim Y; Kato A; Kawakubo N; Yasumoto AA; Yahara T;
Address:		"Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan"
Journal Title:		PLoS One
Year:		2012
Volume:		20120615
Issue:		6
Page Number:		e39010 -
DOI:		10.1371/journal.pone.0039010
ISSN/ISBN:		1932-6203 (Electronic) 1932-6203 (Linking)
Abstract:		"The daylily (Hemerocallis fulva) and nightlily (H. citrina) are typical examples of a butterfly-pollination system and a hawkmoth-pollination system, respectively. H. fulva has diurnal, reddish or orange-colored flowers and is mainly pollinated by diurnal swallowtail butterflies. H. citrina has nocturnal, yellowish flowers with a sweet fragrance and is pollinated by nocturnal hawkmoths. We evaluated the relative roles of flower color and scent on the evolutionary shift from a diurnally flowering ancestor to H. citrina. We conducted a series of experiments that mimic situations in which mutants differing in either flower color, floral scent or both appeared in a diurnally flowering population. An experimental array of 6 x 6 potted plants, mixed with 24 plants of H. fulva and 12 plants of either F1 or F2 hybrids, were placed in the field, and visitations of swallowtail butterflies and nocturnal hawkmoths were recorded with camcorders. Swallowtail butterflies preferentially visited reddish or orange-colored flowers and hawkmoths preferentially visited yellowish flowers. Neither swallowtail butterflies nor nocturnal hawkmoths showed significant preferences for overall scent emission. Our results suggest that mutations in flower color would be more relevant to the adaptive shift from a diurnally flowering ancestor to H. citrina than that in floral scent"
Keywords:		*Color *Flowers Hemerocallis/*physiology *Odorants *Pollen;
Notes:		"MedlineHirota, Shun K Nitta, Kozue Kim, Yuni Kato, Aya Kawakubo, Nobumitsu Yasumoto, Akiko A Yahara, Tetsukazu eng Research Support, Non-U.S. Gov't 2012/06/22 PLoS One. 2012; 7(6):e39010. doi: 10.1371/journal.pone.0039010. Epub 2012 Jun 15"