The pigment-scent connection: do mutations in regulatory vs. structural anthocyanin genes differentially alter floral scent production in Ipomoea purpurea?

摘要: Many recent studies attempting to assess the biochemical connections between anthocyanin biosynthesis and floral scent production have yielded limited insights due in part a focus on either field phenotypes of unknown genetic background or artificial manipulation. In this study, we seek more precisely explore mechanistic color Ipomoea purpurea by comparing inbred lines wild-type purple flowered plants two naturally occurring mutants: albino individuals created chalcone synthase (A locus) loss-of-function mutation rayed that result from non-functional transcription factor (W locus). We found I. is dominated sesquiterpene hydrocarbons, (E)-β-caryophyllene germacrene D, with small amounts several other sesquiterpenoid compounds. These 15 carbon volatiles are derived mevalonic acid biosynthetic pathway, which has no structural precursor relationship pigments. Thus, there direct pleiotropic and, accordingly, differences overall purple-flowered individuals. contrast, showed greater emission compounds when compared their counterparts, suggesting specific mutant regulatory region phenotype could an indirect effect volatile through changes metabolic flux alteration gene expression enzyme activity. Future research should these possible roles for factors across multiple pathways. There were composition rate offspring parents same line, was conserved within each line. However, lines, number elements must contribute species. © 2010 SAAB. Published Elsevier B.V. All rights reserved.