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Höll J, Lindner S, Walter H, Joshi D, Poschet G, Pfleger S, Ziegler T, Hell R, Bogs J, Rausch T. Impact of pulsed UV-B stress exposure on plant performance: How recovery periods stimulate secondary metabolism while reducing adaptive growth attenuation. Plant Cell Environ 2019; 42:801-814. [PMID: 30049021 DOI: 10.1111/pce.13409] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 07/13/2018] [Accepted: 07/15/2018] [Indexed: 05/20/2023]
Abstract
Upon continuous stress exposure, plants display attenuated metabolic stress responses due to regulatory feedback loops. Here, we have tested the hypothesis that pulsed stress exposure with intervening recovery periods should affect these feedback loops, thereby causing increased accumulation of stress-induced metabolites. The response of Arabidopsis plantlets to continuous UV-B exposure (Cuv ) was compared with that of pulsed UV-B exposure (Puv ). The differential responses to Puv versus Cuv were monitored at the level of gene expression and metabolite accumulation, using wild type (WT) and different mutant lines. In comparison with Cuv , Puv increased sinapyl and flavonol (S + F) content, whereas adaptive growth attenuation was reduced. Furthermore, in a myb4 mutant (AtMYB4, repressor-type R2R3-MYB transcription factor), the S + F content was increased only for Cuv , but not beyond the level for Puv observed in WT. These observations and the ability of AtMYB4 to repress AtMYB12/AtMYB111-mediated activation of target gene promoters (pCHS and pFLS) indicate that the increase of S + F content after Puv observed in WT plants results from reduced feedback inhibition by AtMYB4. The results support the notion that stress-induced metabolic changes not necessarily cause a growth penalty. Furthermore, the observed Puv -induced increase in flavonol accumulation may stimulate reevaluation of commercial plant production practices.
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Affiliation(s)
- Janine Höll
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Sonja Lindner
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Hannah Walter
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Drishti Joshi
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Gernot Poschet
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
- Metabolomics Core Technology Platform, Heidelberg University, Heidelberg, Germany
| | - Sina Pfleger
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Tobias Ziegler
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Rüdiger Hell
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
- Metabolomics Core Technology Platform, Heidelberg University, Heidelberg, Germany
| | - Jochen Bogs
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
- Dienstleistungszentrum Ländlicher Raum Rheinpfalz, Viticulture and Enology Group, Neustadt, Germany
- Fachhochschule Bingen, Bingen am Rhein, Germany
| | - Thomas Rausch
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
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