Low genetic diversity in the endangered marine alga Silvetia siliquosa (Ochrophyta: Fucaceae) and the implication to conservation

Liang, Yanshuo; Zhang, Jie; Song, Xiaohan; Choi, Han‐Gil; Gao, Xu; Duan, Delin; Hu, Zi‐Min

doi:10.1007/s00343-021-0400-y

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…It is unclear whether the very low genetic diversity (H = 0.0563, π = 0.0002) in C. giganteus is due to a recent reduction in genetic diversity because of high gene flow or bottleneck effect, or due to a consistent historical lack of diversity (Yang et al 2021b). Nevertheless, this low diversity raises concerns about its ability to adapt to climate change or other environmental alterations, which adds apparent difficulty to conservation efforts for natural seaweed resources (Liang et al 2021, Yang et al 2021b.…”

Section: Discussionmentioning

confidence: 99%

Phylogeography of the economic seaweeds <italic>Chondrus</italic> (Gigartinales, Rhodophyta) in the northwest Pacific based on <italic>rbc</italic>L and COI-5P genes

Yang¹,

Kim²

2022

Algae

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The red algal genus Chondrus have long been used as raw materials for carrageenan and dietary fiber in health foods. Despite the importance of genetic information in safeguarding natural seaweed resources, knowledge of the population genetics of Chondrus in the northwest Pacific is limited. In this study, genetic diversity and phylogeographic structure of 45 populations (777 specimens) of Chondrus from Korea, China, and Japan were evaluated based on mitochondrial COI- 5P gene sequences, and phylogenetic relationships were confirmed based on plastid rbcL gene sequences. Molecular analyses assigned the specimens in this study to three Chondrus species: C. nipponicus, C. ocellatus, and C. giganteus; phenotype-based species classification was impossible owing to their high morphological plasticity. We found moderate intraspecific genetic diversity and a shallow phylogeographic structure in both for C. nipponicus and C. ocellatus, and low intraspecific genetic diversity in C. giganteus. Each of the three species exhibited high-level intraspecific gene flow among regions based on the most common haplotypes (CN1 for C. nipponicus, CO1 for C. ocellatus, and CG1 for C. giganteus). Our comprehensive genetic information provides insights into the phylogeographic patterns and intraspecific diversity of the economically important Chondrus species. It also highlights the need to conserve existing natural Chondrus resources through continuous monitoring of genetic diversity and phylogeographic pattern.

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Section: Discussionmentioning

confidence: 99%

Phylogeography of the economic seaweeds <italic>Chondrus</italic> (Gigartinales, Rhodophyta) in the northwest Pacific based on <italic>rbc</italic>L and COI-5P genes

Yang¹,

Kim²

2022

Algae

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“…Molecular analyses have helped discriminate between macroalgal species and provide information on their distribution (Yang and Kim 2018;Yang et al 2021a, b). In addition, studies on the genetic diversity of species are useful for understanding species adaptations related to temporal and spatial maintenance, particularly for the sustainable use of economic algae (Hu et al 2015;Liang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Molecular phylogeny and genetic diversity of the economic seaweed Meristotheca (Gigartinales, Rhodophyta) in the northwest Pacific, with a description of M. pilulaora sp. nov

Yang,

Kang,

Fujita

et al. 2023

J Appl Phycol

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Species of the red algal genus Meristotheca are important natural resources that can be used directly as food for human consumption as well as raw materials for the extraction of carrageenan. Despite being harvested in Japan and Korea, a comprehensive taxonomic study of Meristotheca specimens from these two countries to elucidate their phylogenetic position is lacking. In this study, we aimed to clarify the taxonomic identities of specimens currently regarded as M. papulosa from Korea and Japan by analyzing morphological and molecular data. As the result, we recognized a new species, Meristotheca pilulaora sp. nov. from Korea and resurrected Meristotheca japonica for specimens from Japan. The two entities have long been identified as M. papulosa and exhibit similar external morphologies. They appeared independently in the concatenated phylogenetic tree of COI-5P and rbcL and could also be distinguished morphologically by the position of cystocarps (blade margins in M. pilulaora; marginal proliferations in M. japonica), spinose cystocarps (absent in M. pilulaora; present in M. japonica), and the number of cortical cell layers (two in M. pilulaora; 4–8 in M. japonica). The DNA analysis of M. pilulaora sp. nov. in local populations showed 11 COI-5P haplotypes on Jeju Island with no apparent geographical structure. High genetic diversity and occurrence of unique haplotypes in southern Jeju may provide a genetic basis for population with high thermal tolerance. These findings have strengthened our understanding of the species diversity of the genus Meristotheca and provided insights into conservation, management, and haplotype selection for the future cultivation of these economically important species.

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“…However, the natural biomass and distribution range of S . siliquosa in East Asia have declined dramatically since the 1990s due to habitat fragmentation and anthropogenic influences [ 5 , 6 ]. S .…”

Section: Introductionmentioning

confidence: 99%

The organellar genomes of Silvetia siliquosa (Fucales, Phaeophyceae) and comparative analyses of the brown algae

et al. 2022

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The brown alga Silvetia siliquosa (Tseng et Chang) Serrão, Cho, Boo & Brawly is endemic to the Yellow-Bohai Sea and southwestern Korea. It is increasingly endangered due to habitat loss and excessive collection. Here, we sequenced the mitochondrial (mt) and chloroplast (cp) genomes of S. siliquosa. De novo assembly showed that the mt-genome was 36,036 bp in length, including 38 protein-coding genes (PCGs), 26 tRNAs, and 3 rRNAs, and the cp-genome was 124,991 bp in length, containing 139 PCGs, 28 tRNAs, and 6 rRNAs. Gene composition, gene number, and gene order of the mt-genome and cp-genome were very similar to those of other species in Fucales. Phylogenetic analysis revealed a close genetic relationship between S. siliquosa and F. vesiculosus, which diverged approximately 8 Mya (5.7–11.0 Mya), corresponding to the Late Miocene (5.3–11.6 Ma). The synonymous substitution rate of mitochondrial genes of phaeophycean species was 1.4 times higher than that of chloroplast genes, but the cp-genomes were more structurally variable than the mt-genomes, with numerous gene losses and rearrangements among the different orders in Phaeophyceae. This study reports the mt- and cp-genomes of the endangered S. siliquosa and improves our understanding of its phylogenetic position in Phaeophyceae and of organellar genomic evolution in brown algae.

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Low genetic diversity in the endangered marine alga Silvetia siliquosa (Ochrophyta: Fucaceae) and the implication to conservation

Cited by 4 publications

References 52 publications

Phylogeography of the economic seaweeds <italic>Chondrus</italic> (Gigartinales, Rhodophyta) in the northwest Pacific based on <italic>rbc</italic>L and COI-5P genes

Phylogeography of the economic seaweeds <italic>Chondrus</italic> (Gigartinales, Rhodophyta) in the northwest Pacific based on <italic>rbc</italic>L and COI-5P genes

Molecular phylogeny and genetic diversity of the economic seaweed Meristotheca (Gigartinales, Rhodophyta) in the northwest Pacific, with a description of M. pilulaora sp. nov

The organellar genomes of Silvetia siliquosa (Fucales, Phaeophyceae) and comparative analyses of the brown algae

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