Abstract
To facilitate restoration of the lava field forests surrounding Mexico City, we developed methods to improve the germination and field seedling performance of Quercus rugosa using hydropriming (regulated hydration of seeds in water), and we used special watering regimes to improve seedling acclimation. The size, dry mass, fresh mass and water content of seeds were measured, and curves were generated to evaluate acorn hydration and dehydration. The effects of stratification (5°C), heat shock (50°C) and scarification on germination were tested. All treated seeds and controls were germinated in control chambers at 21°C. One hydropriming cycle (PC) consisted of two hydration days followed by two dehydration days; treatments of 1, 2 and 3 PCs were tested. Seedlings from 1PC to 2PC were acclimated in a shade house under high and low watering regimes (400 and 200 mL week−1, respectively). In the shade house and field, the effects of hydropriming and watering treatments were evaluated by measuring length, basal diameter, crown cover, number of leaves and branches and leaf area of seedlings. Dry and fresh mass were used to calculate acorn water content. Dehydration and hydration curves displayed hysteresis. Acorns exhibited physiological dormancy, which could be overcome by stratification or by 1 month of storage. 1PC led to increased germination rates and final germination. In both the shade house and field, 1PC showed a positive effect on all seedling growth parameters except branch number. Field survival was not affected. Generally, 1PC favoured efficient seed germination, seedling vigour and homogenous plant production.
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Acknowledgments
We thank Rocío Graniel Parra, Alejandro González Ponce and Daniel Valle Vidal for technical support. We also thank Francisco Hernández Hernández and Benito Sánchez Huerta for the climatological information (Observatorio Metereológico, UNAM). We are grateful to the two anonymous reviewers for the comments and suggestions that allowed a substantial improvement to the paper. This study was supported by the Grants CONACyT 47859-Q and PAPIIT IN222508. CONACyT also provided to L. Castro-Colina a McS scholarship for her studies in the Posgrado en Ciencias Biológicas (Orientación: Restauración Ecológica)-UNAM.
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Communicated by K. Puettmann.
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Castro-Colina, L., Martínez-Ramos, M., Sánchez-Coronado, M.E. et al. Effect of hydropriming and acclimation treatments on Quercus rugosa acorns and seedlings. Eur J Forest Res 131, 747–756 (2012). https://doi.org/10.1007/s10342-011-0548-7
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DOI: https://doi.org/10.1007/s10342-011-0548-7