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Sugar units, not chilling units, control endodormancy duration in plants – potato tuber as a case study

Raz Danieli, Shmuel Assouline, Bolaji Babajide Salam, Paula Teper-Bamnolker, Eduard Belausov, Yael Friedmann, David Granot, Dani Eshel
doi: https://doi.org/10.1101/2021.05.10.443356
Raz Danieli
1Department of Postharvest Science, The Volcani Institute, Agricultural Research Organization (ARO), Rishon LeZion, Israel
2The Inter-Faculty Biotechnology Program, the Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
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Shmuel Assouline
3Department of Environmental Physics and Irrigation, The Volcani Institute, ARO, Rishon LeZion, Israel
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Bolaji Babajide Salam
1Department of Postharvest Science, The Volcani Institute, Agricultural Research Organization (ARO), Rishon LeZion, Israel
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Paula Teper-Bamnolker
1Department of Postharvest Science, The Volcani Institute, Agricultural Research Organization (ARO), Rishon LeZion, Israel
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Eduard Belausov
4Department of Ornamental Horticulture, The Volcani Institute, ARO, Rishon LeZion, Israel
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Yael Friedmann
5The Alexander Silberman Institute of Life Sciences, Faculty of Science, The Hebrew University of Jerusalem, Jerusalem, Israel
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David Granot
6Department of Vegetable Research, The Volcani Institute, ARO, Rishon LeZion, Israel
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Dani Eshel
1Department of Postharvest Science, The Volcani Institute, Agricultural Research Organization (ARO), Rishon LeZion, Israel
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  • For correspondence: dani@agri.gov.il
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Summary

Endodormancy (ED) is a crucial stage in the life cycle of many perennial plants, regulated by genetic and environmental factors. Chilling units, growth regulators, and nutrient supply are considered inducers of ED release, but the mechanism governing ED duration is poorly understood. The potato tuber has been used as a model system to study metabolic processes associated with ED release. Cold-induced sweetening is a well-known response of the tuber to chilling. Here, we found that cold stress induces an increase in sugar units in association with plasmodesmatal closure in the dormant bud cells. Tuber sweetening was associated with shortened ED duration after cooling. Heat exposure also caused sugar unit accumulation followed by faster ED release. A logistic function was developed to predict ED duration based on sugar unit measurements. We discovered that ED release is better correlated with the accumulation of sugar units compared to chilling units. CRISPR/Cas9 knockout of the vacuolar invertase gene (StVInv) induced longer ED, but only in cultivars in which the mutation modified the level sugar units. Our results suggest that sugar units are better predictors of vegetative bud ED duration than chilling units.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted May 10, 2021.
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Sugar units, not chilling units, control endodormancy duration in plants – potato tuber as a case study
Raz Danieli, Shmuel Assouline, Bolaji Babajide Salam, Paula Teper-Bamnolker, Eduard Belausov, Yael Friedmann, David Granot, Dani Eshel
bioRxiv 2021.05.10.443356; doi: https://doi.org/10.1101/2021.05.10.443356
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Sugar units, not chilling units, control endodormancy duration in plants – potato tuber as a case study
Raz Danieli, Shmuel Assouline, Bolaji Babajide Salam, Paula Teper-Bamnolker, Eduard Belausov, Yael Friedmann, David Granot, Dani Eshel
bioRxiv 2021.05.10.443356; doi: https://doi.org/10.1101/2021.05.10.443356

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