| Hu Qunju,Yang Fangfang,Wei Zhangliang,Mo Jiahao,Long Chao,Tian Xinpeng,Long Lijuan. 2020. Detail description of Lithophyllum okamurae (Lithophylloideae, Corallinales), a widely distributed crustose coralline alga in marine ecosystems. Acta Oceanologica Sinica, 39(6):96－106 |
| Detail description of Lithophyllum okamurae (Lithophylloideae, Corallinales), a widely distributed crustose coralline alga in marine ecosystems |
| 广泛分布于海洋生态系统中的壳状珊瑚藻——冈村石叶藻的形态解剖学和分子生物学描述 |
| Received:January 03, 2019 |
| DOI：10.1007/s13131-019-1470-y |
| Key words:Lithophyllum okamurae crustose coralline algae marine ecosystem morphological characteristics conceptacles DNA-barcoding |
| 中文关键词: 冈村石叶藻 壳状珊瑚藻 海洋生态环境 形态特征 生殖窠 DNA条码技术 |
| 基金项目:The Strategic Priority Research Program of the Chinese Academy Sciences under contract No. XDA13020203; the Guangdong Science and Technology Project under contract No. 201707010174; the National Natural Science Foundation of China under contract No. 41806145. |
| Author Name | Affiliation | E-mail | | Hu Qunju | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | Yang Fangfang | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | Wei Zhangliang | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | Mo Jiahao | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | Long Chao | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | Tian Xinpeng | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | Long Lijuan | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | longlj@scsio.ac.cn |
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| Abstract: |
| Lithophyllum okamurae is one of the important encrusting coralline algae, which plays important roles as primary producer, carbonate sediment builder, and habitat provider in the marine ecosystems. In this study, L. okamurae was collected from tropical coast of Sanya, and firstly described based on both detailed morph-anatomical characteristics and molecular studies of typic DNA sequences. The structure of the thalli of L. okamurae was pseudoparenchymatous construction with radially organized dimerous organizations in the crustose portion. The pseudoparenchymatous construction were composed of three parts, including 1 to 3 layers of epithelia cells which had flatten to round outermost walls, one layer of square or rectangular cells of the hypothallia and multiple layers of square or elongated rectangular peripheral cells. Palisade cells were observed, and the cells of the contiguous vegetative filaments were connected by secondary pit-connections with cell fusions absent. The carposporangial conceptacles, the spermatangial conceptacles, the bisporangial conceptacles and the tetrasporangial conceptacles were observed, and all these four kinds of conceptacles were uniporate. The spermatangial conceptacles were slightly convex and buried at shallow depths in the thalli tissues, and the carposporangial conceptacles and asexual conceptacles were protruding and conical. Phylogenetic studies based on DNA barcoding markers of 18S rDNA, COI, rbcL and psbA revealed that L. okamurae clustered with the closest relation of L. atlanticum, and formed a distinct branch. Based on the comparative anatomical features and the molecular data, the detailed description of the valid species of L. okamurae was firstly given in this study to provide theoretical basis for algae resources utilization and conservation in marine ecosystems. |
| 中文摘要: |
| 冈村石叶藻（Lithophyllum okamurae）是一种重要的壳状珊瑚藻，在海洋生态系统中具有提供初级生产力、产生碳酸盐沉积物以及为海洋生物提供栖息环境等功能。本文于三亚的热带海岸采集L. okamurae，首次基于形态解剖学特征和分子生物学方法对其进行了详细的描述。研究表明，L. okamurae的藻体为二组织性的拟薄壁组织结构，被分成三部分，包括：由1-3层呈扁平状正方形或长方形表皮细胞组成的表层，由一层正方形或长方形细胞组成的基层，以及由多层正方形或狭长形细胞组成的围层。在围层中可观察到栅状细胞，相邻藻丝细胞间通过次生纹孔相连，未见细胞融合。本文观察到L. okamurae的四种单孔生殖窠，即果孢子囊生殖窠、精子囊生殖窠、二分孢子囊生殖窠以及四分孢子囊生殖窠。其中，精子囊生殖窠通常浅埋于藻体中并微凸于藻体表面，果孢子囊生殖窠和无性生殖窠呈突出的圆锥形。基于18S rDNA、COI、rbcL和psbA基因序列的系统发育研究表明，L. okamurae和L. atlanticum在同一个进化枝上，亲缘关系最近。本文基于形态解剖学特征和分子生物学数据详细地对L. okamurae进行了描述，为海洋生态系统中藻类资源的利用和保护工作提供理论基础。 |
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