Environment drives spatiotemporal patterns of clonality in white spruce (Picea glauca) in Alaska

Environment drives spatiotemporal patterns of clonality in white spruce (Picea glauca) in Alaska
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环境驱动阿拉斯加白云杉(Picea glauca)克隆性的时空模式

DOI:
10.1139/cjfr-2018-0234
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发表时间:
2018
影响因子:
2.2
通讯作者:
Schnittler M
Schnittler M
中科院分区:
农林科学3区
文献类型:
--
作者:
Würth DG;Eusemann P;Trouillier M;Burras A;Burger A;Wilmking M;Roland CA;Juday GP;Schnittler M

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如果环境条件不利于有性繁殖,许多植物物种通过克隆进行繁殖。为了检验替代假设,克隆是否是一种“退出策略”或选择引起的,克隆生长在白色云杉(云杉(Moench)沃斯)在阿拉斯加州的三个立场,每个组成的核心(封闭的森林)情节和边缘(树线)情节。总共有2571棵树被映射和基因型与11个单序列重复(SSR)标记。克隆树的比例遵循水分梯度,最低的是在干燥的内陆盆地(4.5%),其次是在阿拉斯加山脉(9.0%)和布鲁克斯范围(21.7%)的网站。在后两个网站,克隆生长更频繁的边缘图。比较960棵老树的结果表明,随着树龄的增加,克隆生长的可能性越来越大,并在树的整个生命周期内持续进行。遗传数据并不表明任何克隆的遗传倾向。白色云杉的克隆生长很可能是通过压条生长,并取决于环境条件。由于树木的性能,因此可能植物繁殖成功,是较低的地块与高比例的克隆,选择克隆生长似乎是极不可能的。
Many plant species reproduce by cloning if environmental conditions are unfavorable for sexual reproduction. To test the alternative hypotheses, whether cloning is an “exit strategy” or caused by selection, clonal growth in white spruce (Picea glauca(Moench) Voss) was investigated in three stands in Alaska, each consisting of a core (closed forest) plot and an edge (tree-line) plot. In total, 2571 trees were mapped and genotyped with 11 single sequence repeat (SSR) markers. The proportion of clonal trees follows a moisture gradient and was lowest in the dry Interior basin (4.5%), followed by the sites at the Alaska Range (9.0%) and the Brooks Range (21.7%). At the two latter sites, clonal growth was more frequent in the edge plot. A comparison among 960 aged trees revealed that clonal growth becomes more likely with increasing age and continues over the life span of a tree. Genetic data do not indicate any genetic predisposition for cloning. Clonal growth in white spruce most likely takes place via layering and depends on environmental conditions. Because performance of the trees, and therefore likely plant reproductive success, is lower in plots with a high proportion of clones, selection for clonal growth seems to be highly unlikely.
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