| 1 | 雷州地区马尾藻系统进化分析显示文摘通过PCR扩增测序及种间比对,对获得的6种马尾藻18S rRNA、COI和ITS基因部分同源序列进行分析,结果显示:(1) 18S rRNA基因同源序列长度为1 673 bp,其中保守位点1 668个,可变位点3个,简约信息位点1个,单变异多态位点2个;T、C、A、G的平均含量分别为26.4%、21.4%、24.4%、27.8%。(2) COI同源序列长度为643 bp,其中保守位点567个,可变位点76个,简约信息位点28个,单变异多态位点47个;T、C、A、G的平均含量分别为40.0%、17.6%、19.1%、23.3%。(3) ITS同源序列长度为1 539 bp,其中保守位点1 272个,可变位点193个,简约信息位点55个,单变异多态位点138个;T、C、A、G的平均含量分别为23.5%、26.5%、17.1%、32.9%。(4)基于Kimnra双参数模型计算遗传距离,选用褐藻纲部分物种为外源,构建18S rRNA,COI和ITS基因序列系统发育树。用COI和ITS基因构建的发育树与利用形态学进行的分类较为一致,真马尾藻亚属(Sargassum)的张氏马尾藻(Sargassum zhangii)、全缘马尾藻(Sargassum integerrimum)、匍枝马尾藻(Sargassum polycystum)、亨氏马尾藻(Sargassum henslowianum)、灰叶马尾藻(Sargassum cinereum)亲缘关系较近,先聚为一支,再与反曲叶亚属的半叶马尾藻(Sargassum hemiphyllum)聚为一支,然后与其他亚属的聚为一大支;而用18S rRNA基因构建的发育树中,亨氏马尾藻先与半叶马尾藻聚为一支,后与真马尾藻亚属的聚为一支,最后与其他亚属的聚为一大支。从序列的保守度分析,18S rRNA基因具有高度保守性,可用于属以上单元鉴别分类;COI和ITS基因多态性较高,可用于种间分类。 | 沈城 徐秀菊 陈庆鑫 武艳丽 张艳苹 刘丽 | 2021 | 基因组学与应用生物学2021，40，4： | 1 |
| 2 | Transcriptome sequencing of essential marine brown and red algal species in China and its significance in algal biology and phylogeny显示文摘Most phaeophytes(brown algae) and rhodophytes(red algae) dwell exclusively in marine habitats and play important roles in marine ecology and biodiversity.Many of these brown and red algae are also important resources for industries such as food,medicine and materials due to their unique metabolisms and metabolites.However,many fundamental questions surrounding their origins,early diversification,taxonomy,and special metabolisms remain unsolved because of poor molecular bases in brown and red algal study.As part of the 1 000 Plant Project,the marine macroalgal transcriptomes of 19 Phaeophyceae species and 21 Rhodophyta species from China's coast were sequenced,covering a total of 2 phyla,3 classes,11 orders,and 19 families.An average of 2 Gb per sample and a total 87.3 Gb of RNA-seq raw data were generated.Approximately 15 000 to 25 000 unigenes for each brown algal sample and 5 000 to 10 000 unigenes for each red algal sample were annotated and analyzed.The annotation results showed obvious differences in gene expression and genome characteristics between red algae and brown algae;these differences could even be seen between multicellular and unicellular red algae.The results elucidate some fundamental questions about the phylogenetic taxonomy within phaeophytes and rhodophytes,and also reveal many novel metabolic pathways.These pathways include algal CO2 fixation and particular carbohydrate metabolisms,and related gene/gene family characteristics and evolution in brown and red algae.These findings build on known algal genetic information and significantly improve our understanding of algal biology,biodiversity,evolution,and potential utilization of these marine algae. | WU Shuangxiu SUN Jing CHI Shan WANG Liang WANG Xumin LIU Cui LI Xingang YIN Jinlong LIU Tao YU Jun | 2014 | Acta Oceanologica Sinica2014，33，2： | 0 |
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