<i>Chroococcidiorella tianjinensis</i>gen. et sp. nov. (Trebouxiophyceae, Chlorophyta), a Green Alga Arises from the Cyanobacterium TDX16

• 作者: Qinglin Dong Xiangying Xing
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: Green Algae Cyanobacterial Origin Chroococcidiorella tianjinensis 18S rRNA Gene Sequence Ultrastructure
• 年，卷（期）: mgzwxqkyw_2020,（11）
• 页码范围: 1814-1826
• 页数: 13页
• 分类号: O17

摘要

All algae documented so far are of unknown origin. Here, we provide a taxonomic description of the first origin-known alga TDX16-DE that arises from the <i><span style="font-family:Verdana;">Chroococcidiopsis</span></i><span style="font-family:Verdana;">-like endosymbiotic cyanobacterium TDX16 by de novo organelle biogenesis after acquiring its green algal host</span><i><span style="font-family:Verdana;"> Haematococcus pluvialis</span></i><span style="font-family:Verdana;">’s DNA. TDX16-DE is spherical or oval, with a diameter of 2.0-3.6 μm, containing typical chlorophyte pigments of chlorophyll a, chlorophyll b and lutein and reproducing by autosporulation, whose 18S rRNA gene sequence shows the highest similarity of 99.7% to that of </span><i><span style="font-family:Verdana;">Chlorella vulgaris</span></i><span style="font-family:Verdana;">. However, TDX16-DE is only about half the size of</span><i><span style="font-family:Verdana;"> C. vulgaris </span></i><span style="font-family:Verdana;">and structurally similar to</span><i><span style="font-family:Verdana;"> C. vulgaris</span></i><span style="font-family:Verdana;"> only in having a chloroplast-localized pyrenoid, but differs from</span><i><span style="font-family:Verdana;"> C. vulgaris</span></i><span style="font-family:Verdana;"> in that 1) it possesses a double-membraned cytoplasmic envelope but lacks endoplasmic reticulum and Golgi apparatus;and 2) its nuc</span><span style="font-family:Verdana;">leus is enclosed by two sets of envelopes (four</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">unit membranes). Therefore</span><span style="font-family:;" "=""><span style="font-family:Verdana;">, based on these characters and the cyanobacterial origin, we describe TDX16-DE as a new genus and species, </span><i><span style="font-family:Verdana;">Chroococcidiorella tianjinensis</span></i><span style="font-family:Verdana;"> gen. et sp. nov., which sets the basis for multidisciplinary research.</span></span>