Fragmentation Genetics of Vateria indica: implications for management of forest genetic resources of an endemic dipterocarp
Fragmentation Genetics of Vateria indica: implications for management of forest genetic resources of an endemic dipterocarp
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DOI：
10.1007/s10592-013-0559-7
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发表时间：
2014-06-01
影响因子：
2.2
通讯作者：
Kettle, C. J.
中科院分区：
文献类型：
--
作者：
Ismail, S. A.;Ghazoul, J.;Kettle, C. J.
热带农林景观可能是林业和恢复退化森林的宝贵森林遗传资源储备。龙脑香科是东南亚的一个优势树种科，对热带木材工业具有全球意义。关于人类改良的景观对保护龙胆属植物的遗传多样性有多有效，目前的信息很少。这项研究为了解印度支离破碎的农林景观如何在一棵特有的龙脑果树上维持森林遗传资源提供了基线。我们比较了印度南部西高止山脉孤立和连续林地中受威胁树种印度瓦特里亚的遗传多样性和精细空间遗传结构(FSGS)。我们把这些结果放在塞舌尔和婆罗洲的双翅果的背景下。利用12个核微卫星标记对694个子代进行了亲缘关系分析，以估计花粉和种子的传播。通过苗圃试验，我们评估了近亲交配对生长性能的影响。我们的结果表明，在一个小的孤立地点和一个大的连续地点之间，FSGS水平和基因扩散程度是相当的。实现了花粉长距离流入隔离斑块，似乎有助于维持遗传多样性。苗圃实验表明，选择有利于远缘杂交后代。与来自塞舌尔的另一个高度碎片化和濒危的双翅果树物种相比，距离很近的三个双翅果树个体之间的亲缘关系似乎较小，但比在婆罗洲连续森林中研究的三个双翅果树物种的亲缘关系更密切。我们讨论了我们的发现在保护和恢复碎片化种群中的龙脑果林遗传资源方面的更广泛的影响。
Tropical agro-forest landscapes are potentially valuable reserves of forest genetic resources for forestry and restoration of degraded forests. The Dipterocarpaceae is a dominant Southeast Asian family of tree species of global significance for the tropical timber industry. Very little information exists about how effective human modified landscapes are for conserving genetic diversity in dipterocarp species. This study provides a baseline for understanding how fragmented agro-forest landscapes in India sustain forest genetic resources in an endemic dipterocarp tree. We compare genetic diversity and fine-scale spatial genetic structure (FSGS) in the threatened tree species Vateria indica within an isolated and a continuous forest site in the Western Ghats, South India. We place these results in the context of dipterocarps from both the Seychelles and Borneo. Parentage analysis of 694 progeny using twelve nuclear microsatellite markers is applied to estimate pollen and seed dispersal. Using a nursery trial we evaluate effects of inbreeding on growth performance. Our results show that levels of FSGS, and gene dispersal are comparable between a small isolated and a large continuous site of V. indica. Realized long-distance pollen flow into the isolated patch appears to help maintaining genetic diversity. The nursery experiment suggests that selection favours outbred progeny. Individuals of V. indica in close proximity appear less related to each other than in another highly fragmented and endangered dipterocarp species from the Seychelles, but more related than in three dipterocarp species studied in continuous forest in Borneo. We discuss the wider implications of our findings in the context of conservation and restoration of dipterocarp forest genetic resources in fragmented populations.