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Mol Biol Evol

Title:		Evolution of a Novel and Adaptive Floral Scent in Wild Tobacco
Author(s):		Guo H; Lackus ND; Kollner TG; Li R; Bing J; Wang Y; Baldwin IT; Xu S;
Address:		"Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Jena, Germany. Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena, Germany. Institute for Evolution and Biodiversity, University of Munster, Munster, Germany"
Journal Title:		Mol Biol Evol
Year:		2020
Volume:		37
Issue:		4
Page Number:		1090 - 1099
DOI:		10.1093/molbev/msz292
ISSN/ISBN:		1537-1719 (Electronic) 0737-4038 (Linking)
Abstract:		"Many plants emit diverse floral scents that mediate plant-environment interactions and attain reproductive success. However, how plants evolve novel and adaptive biosynthetic pathways for floral volatiles remains unclear. Here, we show that in the wild tobacco, Nicotiana attenuata, a dominant species-specific floral volatile (benzyl acetone, BA) that attracts pollinators and deters florivore is synthesized by phenylalanine ammonia-lyase 4 (NaPAL4), isoflavone reductase 3 (NaIFR3), and chalcone synthase 3 (NaCHAL3). Transient expression of NaFIR3 alone in N. attenuata leaves is sufficient and necessary for ectopic foliar BA emissions, and coexpressing NaIFR3 with NaPAL4 and NaCHAL3 increased the BA emission levels. Independent changes in transcription of NaPAL4 and NaCHAL3 contributed to intraspecific variations of floral BA emission. However, among species, the gain of expression of NaIFR3 resulted in the biosynthesis of BA, which was only found in N. attenuata. This study suggests that novel metabolic pathways associated with adaptation can arise via reconfigurations of gene expression"
Keywords:		"Acetone/*analogs & derivatives/metabolism Acyltransferases/metabolism Adaptation, Biological/*genetics *Evolution, Molecular Flowers/*enzymology Odorants Oxidoreductases Acting on CH-CH Group Donors/metabolism Phenylalanine Ammonia-Lyase/metabolism Tobacc;"
Notes:		"MedlineGuo, Han Lackus, Nathalie D Kollner, Tobias G Li, Ran Bing, Julia Wang, Yangzi Baldwin, Ian T Xu, Shuqing eng Research Support, Non-U.S. Gov't 2019/12/07 Mol Biol Evol. 2020 Apr 1; 37(4):1090-1099. doi: 10.1093/molbev/msz292"