Abstract
We investigated the influences of two structurally similar glucosinolates, phenethylglucosinolate (gluconasturtiin, NAS) and its (S)-2-hydroxyl derivative glucobarbarin (BAR), as well as their hydrolysis products on larvae of the generalist Mamestra brassicae (Lepidoptera: Noctuidae). Previous results suggested a higher defensive activity of BAR than NAS based on resistance toward M. brassicae larvae of natural plant genotypes of Barbarea vulgaris R. Br. (Brassicaceae) dominated by BAR. In the present study, the hypothesis of a higher defensive activity of BAR than NAS was tested by comparing two Barbarea species similarly dominated either by BAR or by NAS and by testing effects of isolated BAR and NAS on larval survival and feeding preferences. Larvae reared on leaf disks of B. verna (Mill.) Asch. had a lower survival than those reared on B. vulgaris P- and G-chemotypes. Leaves of B. verna were dominated by NAS, whereas B. vulgaris chemotypes were dominated by BAR or its epimer. In addition, B. verna leaves showed a threefold higher activity of the glucosinolate-activating myrosinase enzymes. The main product of NAS from breakdown by endogenous enzymes including myrosinases (“autolysis”) in B. verna leaves was phenethyl isothiocyanate, while the main products of BAR in autolyzed B. vulgaris leaves were a cyclized isothiocyanate product, namely an oxazolidine-2-thione, and a downstream metabolite, an oxazolidin-2-one. The glucosinolates BAR and NAS were isolated and offered to larvae on disks of cabbage. Both glucosinolates exerted similar negative effects on larval survival but effects of NAS tended to be more detrimental. Low concentrations of BAR, but not of NAS, stimulated larval feeding, whereas high BAR concentrations acted deterrent. NAS only tended to be deterrent at the highest concentration, but the difference was not significant. Recoveries of NAS and BAR on cabbage leaf disks were similar, and when hydrolyzed by mechanical leaf damage, the same isothiocyanate-type products as in Barbarea plants were formed with further conversion of BAR to cyclic products, (R)-5-phenyloxazolidine-2-thione [(R)-barbarin] and (R)-5-phenyloxazolidin-2-one [(R)-resedine]. We conclude that a previously proposed generally higher defensive activity of BAR than NAS to M. brassicae larvae could not be confirmed. Indeed, the higher resistance of NAS-containing B. verna plants may be due to a combined effect of rather high concentrations of NAS and a relatively high myrosinase activity or other plant traits not investigated yet.
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Acknowledgements
We thank two anonymous reviewers for constructive comments that improved this paper, Dr. Carl Erik Olsen for NMR analysis of glucosinolate preparations and Dr. David Ian Pattison and Eleni Lazaridi for optimizing the chiral separation method. Ting Yang acknowledges support by the Novo Nordisk Foundation through a Postdoctoral Fellowship (Biotechnology-based Synthesis and Production Research, NNF16OC0019608), while Niels Agerbirk thanks Torben og Alice Frimodts Fond for financial support.
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Conceived overall experiment: NA, CM. Input to experimental design: all. Provided glucosinolates: LL, EP, LU. Analyzed glucosinolate purity: LL, EP, LU, NA. Performed insect experiments and analysis of glucosinolates, myrosinases and C/N: MS, CM. Analyzed products of NAS by GC: EP, LU supervised by LL. Analyzed glucosinolate products by HPLC: NA, TY, AM. Wrote draft: CM, NA. Wrote paper: All.
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Müller, C., Schulz, M., Pagnotta, E. et al. The Role of the Glucosinolate-Myrosinase System in Mediating Greater Resistance of Barbarea verna than B. vulgaris to Mamestra brassicae Larvae. J Chem Ecol 44, 1190–1205 (2018). https://doi.org/10.1007/s10886-018-1016-3
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DOI: https://doi.org/10.1007/s10886-018-1016-3