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  Tendril coiling in grapevine: Jasmonates and a new role for GABA?

Malabarba, J., Reichelt, M., Pasquali, G., & Mithöfer, A. (2019). Tendril coiling in grapevine: Jasmonates and a new role for GABA? Journal of Plant Growth Regulation, 38(1), 38-45. doi:10.1007/s00344-018-9807-x.

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http://dx.doi.org/10.1007/s00344-018-9807-x (Publisher version)
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 Creators:
Malabarba, Jaiana1, Author              
Reichelt, Michael2, Author              
Pasquali, Giancarlo, Author
Mithöfer, Axel3, Author              
Affiliations:
1Department of Bioorganic Chemistry, Prof. Dr. W. Boland, MPI for Chemical Ecology, Max Planck Society, ou_24028              
2Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society, ou_421893              
3Research Group Plant Defense Physiology, Dr. Axel Mithöfer, MPI for Chemical Ecology, Max Planck Society, ou_3022756              

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 Abstract: Grapevine (Vitis vinifera L., Vitaceae) belongs to the genus Vitis, and is characterized as a vine due to the presence of tendrils, which are located opposite to leaves. Tendrils are thigmo-responsive organs, able to carry out delicate mechanosensory responses upon touch and related stimuli. These organs are an adaptation of the plant to climb with the help of support to higher places and finally remain at a position with favorable light quality. In previous studies on Bryonia dioica (Cucurbitaceae), phytohormones of the jasmonate class were identified as the endogenous hormone signals to initiate coiling of the tendrils. Strikingly, this is still the only example for jasmonate-induced tendril coiling. In grapevine, three compounds (12-oxo-phytodienoic acid, jasmonic acid (JA), and JA isoleucine conjugate) of the jasmonate class were found at higher concentrations in non-coiled tendrils when compared with coiled ones. Upon treatment with phytohormones, we could confirm the activity of jasmonates on tendril coiling in grapevine. However, not jasmonates but a non-proteinogenic amino acid, γ-aminobutyric acid (GABA), was detected to accumulate in grapevine tendrils at significantly higher levels than in all other tissues, independent of their coiling status. For GABA we detected a significant, transient positive effect on tendril coiling. Use of a GABA synthesis blocker, 3-mercaptopropionic acid, caused reduced GABA- but not JA-induced coiling scores. No additive effect of JA plus GABA was detectable on the tendrils’ coiling score. Thus, for grapevine, our data demonstrate a strong activity of jasmonates in tendril coiling induction even without mechanical stimuli and, furthermore, the data also suggest that GABA can independently promote tendril coiling.

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 Dates: 2018-04-092018-04-272019-03
 Publication Status: Published in print
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 Identifiers: Other: MIT008
DOI: 10.1007/s00344-018-9807-x
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Title: Journal of Plant Growth Regulation
Source Genre: Journal
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Publ. Info: New York : Springer-Verlag New York
Pages: - Volume / Issue: 38 (1) Sequence Number: - Start / End Page: 38 - 45 Identifier: ISSN: 0721-7595
CoNE: https://pure.mpg.de/cone/journals/resource/954925532003