Abstract
Plant trichomes are known for their capability to produce and store secondary metabolites that protect plants from biotic and abiotic stresses. 1H NMR studies on intact individual trichomes located on the leaf surface of Nicotiana attenuata revealed the presence of two major secondary metabolites: nicotine, the signature metabolite of the genus, and phaseoloidin, a homogentisic acid glucoside. This glucoside was reported originally from the seeds of Entada phaseoloides, and this is the first report of its occurrence in a Solanaceous plant. Artificial diet feeding bioassays with Manduca sexta and Spodoptera littoralis larvae, two important herbivores of N. attenuata, revealed that the ingestion of phaseoloidin negatively influenced caterpillar performance. This effect was more pronounced for the generalist, S. littoralis, than for the specialists, M. sexta.
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We thank three anonymous reviewers for their comments and the Max Planck Society for funding.
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Alexander Weinhold, Kamel Shaker, and Michael Wenzler contributed equally to the results presented in this paper.
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Supplemental Figure S1
Light micrographs of intact glandular trichomes of Nicotiana attenuata WT leaves. A Two different trichome types are found on the leaf surface, short trichomes with a stem consisting of two to four cells and a multi cellular head (type D), as well as tall trichomes with a multi cellular base, a stem (six to ten cells) and a small head (type C). The short trichomes are found mainly on the leaf surface whereas the tall ones are mostly located on the leaf veins shown in C, where they are even larger than on the surface. Magnification (200x) of a type D trichome B and of the head of a type C trichome (100×) D reveal green structures in the heads, most likely chloroplasts, as described for N. tabacum. E Trichomes of the insertional mutant irGAL83 are characterized by their enlarged basal cells. (JPEG 0 kb)
Supplemental Figure S2
Phaseoloidin contents in the trichomes of the insertional mutant irGAL83 and the Nicotiana attenuata wild type line do not differ. Two excised leaves were gently frozen over liquid nitrogen. The trichomes were harvested by gently scratching the leaf surface with a microscope cover slip. The plate was rinsed with 10 ml methanol. Afterwards the extract was concentrated to 1 ml under a constant flow of nitrogen. After centrifuging, the supernatant was transferred to HPLC vials. Phaseoloidin content was analyzed by LC-TOF-MS. Error bars indicate standard errors (WT N = 4; insertional mutant N = 3). (PDF 70.3 kb)
Supplemental Figure S3
Aliphatic part of the NMR spectra from the type C and D trichome samples. The spectrum of D Head contains much more sugar and fatty acid signals, belonging to acyl sugars, than the spectra of C Tip and C Middle. (PDF 96.0 kb)
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Weinhold, A., Shaker, K., Wenzler, M. et al. Phaseoloidin, a Homogentisic Acid Glucoside from Nicotiana Attenuata Trichomes, Contributes to the Plant’s Resistance against Lepidopteran Herbivores. J Chem Ecol 37, 1091–1098 (2011). https://doi.org/10.1007/s10886-011-0012-7
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DOI: https://doi.org/10.1007/s10886-011-0012-7