Abstract—

Taxonomic status of birches (Betula pendula, B. pubescens or their hybrids) is identified by molecular genetics assay of the ploidy level using SSR-markers in moist and peatland forest types. Studies are performed on experimental forest sites of the Institute of Forest Science in the center of the East European plain. B. pendula × B. pubescens hybrids accounted for 11% of the combined dataset. Thus, the birch hybrids are essential components of natural communities. We demonstrate for the first time that B. pendula is predominant, the hybrids are rare, and B. pubescens occurs sporadically on oligotrophic peat bogs. B. pendula grew in the canopy while B. pubescens and the hybrids grew in second story of moist blueberry pine forests. Identification of birch species using keys for the flora species is proven to be confusing due to the occurrence of different combinations of traits. All genetically identified B. pendula trees had twigs growing upwards, without pendulous traits.

中文翻译：

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东欧平原中部泥炭地和毛化林类型的银和绒毛桦树的分子遗传学研究

摘要—

桦木（Betula pendula，B。pubescens或它们的杂种）的分类状况通过在湿地和泥炭地森林类型中使用SSR标记通过倍性水平的分子遗传学分析来鉴定。在东欧平原中心的森林科学研究所的实验性森林地点进行了研究。短枝芽孢杆菌×耻骨芽孢杆菌杂种占组合数据集的11％。因此，桦树杂种是自然群落的重要组成部分。我们首次证明，B。pendula占主导地位，杂种很少见，并且B. pubescens偶尔出现在贫营养的泥炭沼泽上。B. pendula生长在树冠中，而B. pubescens杂种生长在潮湿的蓝莓松林的第二层。事实证明，由于性状的不同组合的出现，使用菌群物种的密钥对桦树物种进行鉴定令人困惑。所有经过基因鉴定的B. pendula树都有向上生长的树枝，没有下垂特征。