Abstract：
:Floral scent emission rate and composition of purple and white flower color morphs of Hesperis matronalis (Brassicaceae) were determined for two populations and, for each, at two times of day using dynamic headspace collection and GC-MS. The floral volatile compounds identified for this species fell into two main categories, terpenoids and aromatics. Principal component analysis of 30 compounds demonstrated that both color morphs emitted more scent at dusk than at dawn. Color morphs varied in chemical composition of scent, but this differed between populations. The white morphs exhibited significant differences between populations, while the purple morphs did not. In the white morphs, one population contains color-scent associations that match expectations from classical pollination syndrome theory, where the flowers have aromatic scents, which are expected to maximize night-flying moth pollinator attraction; in the second population, white morphs were strongly associated with terpenoid compounds. The potential impact that pollinators, conserved biosynthetic pathways, and the genetics of small colonizing populations may have in determining population-specific associations between floral color and floral scent are discussed.
journal_name
Phytochemistryjournal_title
Phytochemistryauthors
Majetic CJ,Raguso RA,Tonsor SJ,Ashman TLdoi
10.1016/j.phytochem.2006.12.009subject
Has Abstractpub_date
2007-03-01 00:00:00pages
865-74issue
6eissn
0031-9422issn
1873-3700pii
S0031-9422(06)00784-9journal_volume
68pub_type
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