Journal of Tropical Oceanography >
Comparative study on the cell morphological transformation and transcriptome of Phaeocystis globosa Scherffel
Received date: 2023-11-24
Revised date: 2023-12-27
Online published: 2024-01-08
Supported by
National Natural Science Foundation of China(41976114)
National Natural Science Foundation of China(42376159)
Open Project of the National Key Laboratory for Environmental Protection of Coastal Ecological Environment(202311)
Phaeocystis globosa is an important and cosmopolitan harmful alga in coastal area. This study conducted a comparative analysis on the cell morphological characteristics and transcriptome of P. globosa isolated from the Beibu Gulf of Guangxi Province. The results indicate that P. globosa contains two types of cells: motile flagellated cells and non-motile cells without flagella. The cell size is 2-5 μm and the non-motile cells are capable of forming colonies, with diameters ranging from few micrometers to several hundred micrometers. Transcriptome analysis reveals that colonial cells exhibit more genes with upregulated expression than solitary cells and most of the differentially expressed genes are associated with transport, decomposition metabolism, amino acids, lipids, carbohydrates, and other metabolic pathways. Particularly, the gene encoding UDP-glucose-4-epimerase, which is involved in polysaccharide biosynthesis, shows significantly upregulated expression, indicating extensive synthesis of glycosaminoglycans during the formation of colony. These results provide basic information for further understanding the morphological transformation mechanism of P. globosa in different geographical strains.
Key words: Phaeocystis globosa; solitary cells; colony; transcriptome
WANG Xiyan , XUE Yue , MENG Bufan , FU Feng , SHEN Pingping . Comparative study on the cell morphological transformation and transcriptome of Phaeocystis globosa Scherffel[J]. Journal of Tropical Oceanography, 2024 , 43(5) : 49 -57 . DOI: 10.11978/2023174
图1 球形棕囊藻的生长状况a. 单细胞生长曲线; b. 囊体生长曲线; c. 囊体直径与生长天数的关系; d. 囊体细胞数量与其直径的相关性 Fig. 1 Growth status of Phaeocystis globosa. (a) Growth curve of solitary cells; (b) growth curve of colonies; (c) relationship between colonial diameter and culture time; (d) correlation between the number of colonial cells and diameter |
图3 北部湾株球形棕囊藻囊体细胞形态a. 较大的囊体; b. 新生成的小囊体; c. 极性囊体; d. 内部细胞逸出的囊体; e. 细胞聚集体, 无囊体边界; f. 聚集体中具鞭毛细胞 Fig. 3 Colonial cells morphology of Phaeocystis globosa Beibu Gulf strain. (a) Larger colony; (b) newly formed small colony; (c) polarized colony; (d) colony with internal cells escape; (e) cell aggregate without colonial boundaries; (f) cells with flagella in the aggregate |
图4 北部湾株球形棕囊藻单细胞电镜扫描形态a和b. 具有2根长鞭毛及1根定鞭毛的单细胞; c. 具有凹陷的无鞭毛单细胞; d. 具有2条短鞭毛突起的单细胞 Fig. 4 Solitary cell morphology of Phaeocystis globosa Beibu Gulf strain under scanning electron microscopy. (a) and (b) Solitary cell with flagella and haptonema; (c) solitary cell with concave shape and no flagella; (d) solitary cell with two short flagella protrusions |
图5 球形棕囊藻不同形态细胞差异基因表达量的变化a. 囊体和单细胞的差异表达基因数量统计图, 筛选条件为Padjust≤0.05并且|log2FC|≥1; b. 囊体和单细胞的差异表达基因的火山图, 显示不同样本间基因表达差异程度。log2FC中的FC即差异倍数(fold change), 表示两样品(组)间表达量的比值, 对其取以2为底的对数之后即为log2FC, 另外用P值的负对数(-Log10(P-value))来表示P值的显著性; 红色表示上调基因, 蓝色表示下调基因 Fig. 5 Changes in differential gene expression levels in different cells of Phaeocystis globosa. (a) Statistical diagram of the number of differentially expressed genes between colonial cells and solitary cells, with screening conditions of Padjust ≤ 0.05 and | log2FC | ≥ 1; (b) volcano map of differentially expressed genes between colonial and solitary cells, showing the degree of gene expression differences between different samples. The FC in log2FC is fold change, which represents the ratio of expression between two samples (groups), and is log2FC after taking the logarithm with 2 as the base, additionally the negative logarithm of the P-value (-Log10(P-value)) was used to indicate the significance of the P-value; Red indicates upregulation of genes, while blue indicates downregulation of genes |
图6 球形棕囊藻囊体细胞和单细胞的差异基因KEGG功能注释和富集通路分析a. 囊体和单细胞的差异基因功能注释图; b. 囊体和单细胞的差异表达基因KEGG富集通路图(前20) Fig. 6 Functional annotation and enrichment pathway analysis of the differential gene KEGG between the colonial and solitary cells of Phaeocystis globosa. (a) Function annotation diagram of differentially expressed genes between the colonial and solitary cells; (b) KEGG enrichment pathway diagram of differentially expressed genes in the colonial and solitary cells (top 20) |
[1] |
曹西华, 俞志明, 邱丽霞, 2017. 改性黏土法消除球形棕囊藻赤潮的现场实验与效果评估[J]. 海洋与湖沼, 48(4): 753-759.
|
[2] |
胡晓坤, 张清春, 陈振帆, 等, 2019. 北部湾海域球形棕囊藻遗传多样性分析[J]. 海洋与湖沼, 50(3): 601-610.
|
[3] |
胡晓燕, 殷明焱, 夏娃, 等, 2006. 中国金色藻属四个新记录种的超微结构研究[J]. 植物分类学报, 44(1): 64-71.
|
[4] |
胡章喜, 邓蕴彦, 唐赢中, 2019. 我国北部湾球形棕囊藻(Phaeocystis globosa)的表面形态和细胞超微结构的电镜观察[J]. 海洋与湖沼, 50(3): 621-629.
|
[5] |
李杰, 陆家昌, 赖俊翔, 等, 2022. 球形棕囊藻游离单细胞的密度与囊体形成的关系研究[J]. 植物科学学报, 40(1): 84-95.
|
[6] |
刘洁生, 彭喜春, 杨维东, 2007. 球形棕囊藻溶血毒素对兔红细胞作用的AFM观察[J]. 热带海洋学报, 26(2): 55-58.
|
[7] |
刘悦, 李丽, 翟晓辉, 等, 2022. 深圳大鹏湾一次球形棕囊藻藻华的发生过程及成因分析[J]. 热带海洋学报, 41(3): 164-171.
|
[8] |
覃仙玲, 赖俊翔, 陈波, 等, 2016. 棕囊藻北部湾株的18S rDNA分子鉴定[J]. 热带亚热带植物学报, 24(2): 176-181.
|
[9] |
曲凌云, 吕颂辉, 高春蕾, 等, 2008. 棕囊藻渤海株核糖体18S rDNA和ITS基因结构序列分析[J]. 海洋科学进展, 26(2): 200-206.
|
[10] |
沈萍萍, 齐雨藻, 2021. 棕囊藻属(Phaeocystis)的种类多样性及地理分布特征研究进展[J]. 海洋与湖沼, 52(1): 1-15.
|
[11] |
沈萍萍, 齐雨藻, 欧林坚, 2018. 中国沿海球形棕囊藻(Phaeocystis globosa)的分类、分布及其藻华[J]. 海洋科学, 42(10): 146-162.
|
[12] |
沈萍萍, 王艳, 齐雨藻, 等, 2000. 球形棕囊藻的生长特性及生活史研究[J]. 水生生物学报, 24(6): 635-643.
|
[13] |
王一奇, 丁翔翔, 宋会银, 等, 2023. 青岛近海球形棕囊藻的宏条形码分析[J]. 海洋与湖沼, 54(5): 1351-1362.
|
[14] |
厦门大学, 2012-03-28. 球形棕囊藻培养液的除菌方法.中国: CN201110329306.8[P](in Chinese).
|
[15] |
徐轶肖, 何喜林, 张腾, 等, 2020. 北部湾棕囊藻藻华原因种分析[J]. 热带海洋学报, 39(6): 122-130.
|
[16] |
薛玥, 2023. 中国沿海球形棕囊藻(Phaeocystis globosa Scherffel)遗传多样性研究[D]. 烟台: 烟台大学.
|
[17] |
晏荣军, 尹平河, 潘剑宇, 等, 2006. 棕囊藻囊泡的培养与去除研究[J]. 热带海洋学报, 25(3): 69-71.
|
[18] |
杨和福, 2004. 棕囊藻的生物学概述Ⅰ. 形态分类和生理生态学[J]. 东海海洋, 22(1): 49-63.
|
[19] |
张昆, 2020. 球形棕囊藻囊体形成的分子机制[D]. 厦门: 厦门大学.
|
[20] |
|
[21] |
|
[22] |
|
[23] |
|
[24] |
|
[25] |
|
[26] |
|
[27] |
|
[28] |
|
[29] |
|
[30] |
|
[31] |
|
[32] |
|
[33] |
|
[34] |
|
[35] |
|
[36] |
|
[37] |
|
[38] |
|
/
〈 |
|
〉 |