综合遗传分析揭示了小笠原群岛特有物种--Calanthe hoshii(兰科)的遗传结构和多样性:对适当保护极度濒危物种的影响

IF 1.1 4区 生物学 Q4 ECOLOGY Plant Species Biology Pub Date : 2024-07-23 DOI:10.1111/1442-1984.12479
Mayu Katafuchi, Satoshi Narita, Yoshiteru Komaki, Atsushi J. Nagano, Tomohisa Yukawa, Yoshihisa Suyama, Shun K. Hirota, Michimasa Yamasaki, Yuji Isagi
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引用次数: 0

摘要

小笠原群岛在整个地质历史中与大陆隔绝,拥有丰富的特有物种。然而,32% 的本地植物物种被列入日本红色名录,表明其濒临灭绝。在这些濒危物种中,Calanthe hoshii 尤为突出,极易灭绝。2020 年,有 2 个野生个体和 89 个异地个体存活,但最后一个已知的野生个体于 2021 年 10 月死亡,这表明该物种可能已在野外灭绝。尽管根据《濒危野生动植物种保护法》开展了保护工作,但由于缺乏有关残存个体遗传多样性和种群结构的基本信息,这对制定有效的保护措施构成了重大障碍。在这项研究中,我们对野生个体和异地个体进行了遗传分析,结果表明个体间的遗传多样性明显降低,个体杂合度(1.0 × 10-5)仅为近缘物种 Calanthe triplicata(1.5 × 10-4)的九分之一。综合遗传分析表明,C. hoshii 由三个大小不同的遗传群组成:群 1 占总种群的 95%,而群 2 和群 3 只存在于小石川植物园的异地种群中,个体数量很少。由于现存 C. hoshii 在个体和种群水平上都保持着极低的遗传多样性,因此有必要考虑未来的管理策略,例如在本研究中发现的不同支系之间进行人工繁育,以保障该物种的稳定性和恢复力。
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Comprehensive genetic analysis reveals the genetic structure and diversity of Calanthe hoshii (Orchidaceae), an endemic species of the Ogasawara Islands: Implications for appropriate conservation of a critically endangered species
The Ogasawara Islands, isolated from the continent throughout their geological history, harbor abundant endemic species. However, 32% of the native plant species are on the Japanese Red List, signaling their endangered status. Among these endangered species, Calanthe hoshii stands out as highly susceptible to extinction. Two wild and 89 ex situ individuals were alive in 2020, but the last known wild individual died in October 2021, indicating this species may have become extinct in the wild. Despite the conservation efforts under the Act for the Conservation of Endangered Species of Wild Fauna and Flora, the lack of essential information regarding genetic diversity and population structure among the remaining individuals poses a significant obstacle to developing effective conservation measures. In this research, we conducted a genetic analysis of the wild and ex situ individuals, which revealed notably reduced genetic diversity between individuals, with individual heterozygosity levels (1.0 × 10−5) measuring one‐ninth of those observed within a closely related species Calanthe triplicata (1.5 × 10−4). Comprehensive genetic analysis revealed that C. hoshii consisted of three genetic clusters of different sizes: cluster 1 comprised 95% of the total population, while clusters 2 and 3, with few individuals, were only found in the ex situ populations at Koishikawa Botanical Garden. Since extant C. hoshii maintains a remarkably low genetic diversity at both individual and population levels, it is necessary to consider future management strategies, such as artificial breeding among different clades identified in this study, to safeguard the stability and resilience of this species.
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来源期刊
Plant Species Biology
Plant Species Biology 生物-生态学
CiteScore
2.70
自引率
14.30%
发文量
36
审稿时长
>12 weeks
期刊介绍: Plant Species Biology is published four times a year by The Society for the Study of Species Biology. Plant Species Biology publishes research manuscripts in the fields of population biology, pollination biology, evolutionary ecology, biosystematics, co-evolution, and any other related fields in biology. In addition to full length papers, the journal also includes short research papers as notes and comments. Invited articles may be accepted or occasion at the request of the Editorial Board. Manuscripts should contain new results of empirical and/or theoretical investigations concerning facts, processes, mechanisms or concepts of evolutionary as well as biological phenomena. Papers that are purely descriptive are not suitable for this journal. Notes & comments of the following contents will not be accepted for publication: Development of DNA markers. The journal is introducing ''Life history monographs of Japanese plant species''. The journal is dedicated to minimizing the time between submission, review and publication and to providing a high quality forum for original research in Plant Species Biology.
期刊最新文献
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