Pollen source affects acorn production in pedunculate oak (Quercus robur L.)

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McClory, R., Ellis, R. H. ORCID: https://orcid.org/0000-0002-3695-6894, Lukac, M. ORCID: https://orcid.org/0000-0002-8535-6334 and Clark, J. (2024) Pollen source affects acorn production in pedunculate oak (Quercus robur L.). Journal of Forestry Research, 35 (1). 124. ISSN 1993-0607

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To link to this item DOI: 10.1007/s11676-024-01777-9

Abstract/Summary

Acorn production in oaks (Quercus spp.) shows considerable inter-annual variation, known as masting. The effect of pollen sourced from trees within or outside the stand on acorn production were investigated in pedunculate oak (Quercus robur L.) in an ancient mixed woodland during two moderate masting years. Comparisons were made between natural pollination, hand pollinations with out-of-stand pollen, in-stand pollen or a 1:1 combination of the two pollen sources, and for bagged flowers left unpollinated. After all treatments, >85% of the flowers or developing acorns were aborted between May and August of both years. When flowers were protected with pollen bags and no pollen added, no acorns were produced. In contrast, hand pollination with out-of-stand pollen produced the most acorns both years and significantly more than within-stand pollen or natural pollination in 2022. Hand pollination with out-of-stand or within-stand pollen provided significantly more acorns than natural pollination in 2023. In 2022, hand pollination with a 1:1 mixture of out-of-stand and within-stand pollen yielded an intermediate number of mature acorns between those for the out-of-stand and within-stand pollination treatments. The study provides clear evidence of maternal choice during acorn development in pedunculate oak and of the benefits of pollen supplementation. It also confirms that pedunculate oak is a fruit-maturation masting species; abortion of pollinated flowers and immature acorns determines a mast year (rather than the number of flowers produced) at this site.

Item Type:	Article
Refereed:	Yes
Divisions:	Life Sciences > School of Agriculture, Policy and Development > Department of Crop Science
ID Code:	115923
Uncontrolled Keywords:	Quercus robur L.; acorns; masting; pedunculate oak; pollination
Publisher:	Springer

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Pollen source affects acorn production in pedunculate oak (Quercus robur L.)

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