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

IF 3.4 2区 农林科学 Q1 FORESTRY
Ryan McClory, Richard H. Ellis, Martin Lukac, Jo Clark
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Abstract

Acorn production in oaks (Quercus spp.) shows considerable inter-annual variation, known as masting. The effects 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.

Abstract Image

花粉源对有花梗橡树(Quercus robur L.)橡子产量的影响
橡树(Quercus spp.)的橡子产量显示出相当大的年际变化,即所谓的萌发。研究人员调查了在两个中度凋落年中,在一片古老的混合林地中,有梗橡树(Quercus robur L.)从林内或林外采集花粉对橡子产量的影响。比较了自然授粉、用林外花粉、林内花粉或两种花粉源 1:1 的组合进行人工授粉以及未授粉的袋装花。经过所有处理后,在这两年的 5 月至 8 月期间,85% 的花或正在发育的橡子流产。用花粉袋保护花朵而不添加花粉时,没有结出橡子。相比之下,用架外花粉进行人工授粉在这两年结出的橡子最多,2022 年明显多于架内花粉或自然授粉。2023 年,用站外花粉或站内花粉人工授粉结出的橡子明显多于自然授粉。2022 年,用站外花粉和站内花粉按 1:1 的比例混合人工授粉产生的成熟橡子数量介于站外授粉和站内授粉处理之间。这项研究清楚地证明了有柄栎在橡子发育过程中的母本选择以及补充花粉的益处。该研究还证实了截干栎是一种果实成熟期较短的树种;授粉花和未成熟橡子的凋落决定了该地点的萌芽年(而不是花的生产数量)。
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来源期刊
CiteScore
7.30
自引率
3.30%
发文量
2538
期刊介绍: The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects: Basic Science of Forestry, Forest biometrics, Forest soils, Forest hydrology, Tree physiology, Forest biomass, carbon, and bioenergy, Forest biotechnology and molecular biology, Forest Ecology, Forest ecology, Forest ecological services, Restoration ecology, Forest adaptation to climate change, Wildlife ecology and management, Silviculture and Forest Management, Forest genetics and tree breeding, Silviculture, Forest RS, GIS, and modeling, Forest management, Forest Protection, Forest entomology and pathology, Forest fire, Forest resources conservation, Forest health monitoring and assessment, Wood Science and Technology, Wood Science and Technology.
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