Abstract
Current environmental conditions are known to affect plant growth, morphology, phenology, and therefore, plant performance. However, effects of the previous-year environmental conditions can also affect plant structure by altering bud growth, and proportion and date of budburst. Here, we analysed the effects of previous-year water stress and shade on bud size, percentage, and date of budburst in seedlings of three co-occurring Iberian Quercus species in two independent experiments. Responses of apical, lateral, and basal buds were checked during an annual cycle. In the first experiment, seedlings of two evergreens (Q. coccifera L., Q. ilex subsp. ballota (Desf.) Samp.) and a deciduous-marcescent tree (Q. faginea Lam.) were grown under two levels of summer watering. In the second experiment, seedlings were grown under three light intensities. Soluble sugars and starch in shoots and roots were measured before budburst. Summer drought increased bud size of all species and advanced budburst of Q. ilex and Q. coccifera. Moderate and/or intense shade tended to reduce bud size and delay budburst in all species. These responses seem related to changes in the date of bud formation rather than to the amount of carbon reserves, which were reduced both by drought and shade. Treatments affected percentage of budburst in lateral buds, which was reduced by shade and water stress, probably leading to narrower crowns. These results show that previous-year environmental conditions are relevant for plant phenology and structure. The different responses in budburst date between the deciduous and the evergreens might alter their competition relationships at seedling stage.
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Acknowledgments
We wish to thank Oscar Godoy for his help with fieldwork and Lucía Gálvez for editing the English of this manuscript. Barbara Cuesta, Luis Merino and Sara Palacio kindly commented on the manuscript. Virginia Sanz-Pérez was supported by a grant from the Comunidad de Castilla, La Mancha. This study is part of research project CGL2007-61873/BOS.
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Communicated by R. Matyssek.
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Sanz-Pérez, V., Castro-Díez, P. Summer water stress and shade alter bud size and budburst date in three mediterranean Quercus species. Trees 24, 89–97 (2010). https://doi.org/10.1007/s00468-009-0381-5
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DOI: https://doi.org/10.1007/s00468-009-0381-5