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Dormancy breaking in Fagus sylvatica seeds is linked to formation of abscisic acid-glucosyl ester

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Abstract

Seed dormancy is an adaptive mechanism that allows seed germination under suitable environmental conditions. Germination of stored dormant seeds proceeds after dormancy breaking induced by stratification. To improve understanding of dormancy breaking in beechnuts, we: investigated effects of moisture content and temperature during storage; analysed contents of abscisic acid, abscisic acid metabolites and indole-3-acetic acid in embryonic axes during storage and stratification; and histochemically localized storage proteins in embryogenic axes and cotyledons of beechnut embryos. The results show that storage conditions can affect the nuts’ abscisic acid contents, but not the stratification process. In addition, dormancy breaking is linked to a reduction in abscisic acid contents and depth of dormancy is not influenced by either of these storage factors. Detected changes that correlated most strongly with dormancy breaking were a big increase in abscisic acid-glucosyl ester levels and accompanying reduction in the abscisic acid-glucosyl ester to abscisic acid ratio. We detected extremely low concentrations of other abscisic acid metabolites-neophaseic, phaseic and dihydrophaseic acids—in non-dormant stored beechnuts, but somewhat higher concentrations during dormancy. No relationships between changes in indole-3-acetic acid levels with either storage conditions or dormancy breaking were detected. Changes in distributions of storage proteins were related to the seeds’ moisture content during storage and stratification rather than seed dormancy. We conclude that increases in endogenous abscisic acid-glucosyl ester levels and abscisic acid-glucosyl ester to abscisic acid ratios are good markers of depth of dormancy and/or effectiveness of stratification in beechnuts.

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Acknowledgements

This research was supported by the Ministry of Agriculture of the Czech Republic (Project designation QI102A256) and Ministry of Education, Youth and Sports of the Czech Republic (Project designation LTC 17030). Authors are grateful to Zdenka Procházková for all her suggestions and assistance in this Project and to Sees-editing Ltd. for linguistic editing of the manuscript.

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Correspondence to Zuzana Vondráková.

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Table S1

Detail results of statistical treatments. One-way ANOVA results and Tukey test of the means comparison was used. All data obtained in experimental variants for each phytohormone/metabolite were calculated and summarized in separated tables. Fresh – F (pre-storage) seeds; seeds with 22% of moisture content (S22); seeds with 9% of moisture content (S9) (XLSX 40 kb)

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Vondráková, Z., Pešek, B., Malbeck, J. et al. Dormancy breaking in Fagus sylvatica seeds is linked to formation of abscisic acid-glucosyl ester. New Forests 51, 671–688 (2020). https://doi.org/10.1007/s11056-019-09751-8

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  • DOI: https://doi.org/10.1007/s11056-019-09751-8

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