Sugar accumulation disorder Berry Shrivel – from current knowledge towards novel hypothesis
In contrast to fruit and grape berry ripening, the biological processes causing ripening disorders are often much less understood, although shriveling disorders of fruits are manifold and contribute to yield losses and reduced fruit quality worldwide. Shrinking berries are a common feature for all shriveling disorders in grapevine although their timing of appearance during the berry ripening process and their underlying induction processes distinct them from each other. The sugar accumulation disorder Berry Shrivel (BS) is characterized by a suppression of sugar accumulation short after veraison resulting in berries low in sugar content and anthocyanins in berry skins, while the organic acid content is similar. Recent studies analyzed the biochemical, morphological and molecular processes affected in BS berries and linked early changes to the period of ripening onset [1,2]. In the presented review, we aim to merge the existing information on the transcriptional and biochemical level in order to draw novel conclusions on sugar unloading, berry ripening control and cell wall modification as well as cell death processes in affected grape clusters. Thereby, we aim to address the questions, if BS is related to a disturbed ripening control in combination with a malfunctional sugar unloading process. Additionally, we aim to conclude on the assimilate transport capacities towards BS berries by analyzing the current information on cell death processes in pedicels and berries and the transcriptional regulation of genes modifying the cell wall. In this way, we modify current hypothesis on BS induction and suggest next steps to identify possible causes.
Acknowledgements: Partially funded by the Austrian Science Fund (FWF) Project P28966-B29.
1) Hoff, R.T. et al. (2021) Onset and progression of the berry shrivel ripening disorder in grapes. Austr. J. Grape Wine Res., 27: 280-289. https://doi.org/10.1111/ajgw.12471
2) Savoi, S. et al. (2019) Transcriptomics of the grape berry shrivel ripening disorder. Plant Mol. Biol. 100, 285–301 (2019). https://doi.org/10.1007/s11103-019-00859-1
Issue: ICGWS 2023
1University of Natural Resources and Life Sciences Vienna, Department of Crop Sciences, Institute of Viticulture and Pomology, Konrad-Lorenz Straße 24, 3430 Tulln, Austria
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grape berry ripening, sugar unloading, cell wall modification, cell death