New unicellular red alga, Bulboplastis apyrenoidosa gen. et sp nov (Rhodellophyceae, Rhodophyta) from the mangroves of Japan: Phylogenetic and ultrastructural observations
New unicellular red alga, Bulboplastis apyrenoidosa gen. et sp nov (Rhodellophyceae, Rhodophyta) from the mangroves of Japan: Phylogenetic and ultrastructural observations
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DOI：
10.1111/j.1440-1835.2012.00643.x
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发表时间：
2012-04-01
影响因子：
1.5
通讯作者：
Hara, Yoshiaki
中科院分区：
文献类型：
--
作者：
Kushibiki, Asuka;Yokoyama, Akiko;Hara, Yoshiaki
一种从日本西南部西表岛红树林地区采集的新型单细胞红藻被描述为 Bulboplastis apyrenoidosa gen。等十一月细胞呈球形，平均直径11.2μm，并被厚厚的粘液鞘包围。灰绿色叶绿体有许多延伸到整个细胞的裂片，并且缺乏蛋白核。这种叶绿体类型与空泡青藻相似，但与其他单细胞红藻不同。质体球簇出现在叶绿体包膜下方，但仅出现在细胞外围。外围环绕类囊体不存在。高尔基体围绕中央核，这是狄克逊菌目所有成员共有的排列方式。一些有丝分裂期的亚细胞特征与其他单细胞红藻的亚细胞特征非常相似。在处于末期的细胞中可以看到位于电子致密材料内的一对环形结构。极环的大小在 Dixoniellales 报道的范围内。基于小亚基 rDNA 的系统发育分析表明，B. apyrenoidosa 是 Dixoniellales 的成员，并且是 Neorhodella 和 Dixoniella 的姐妹谱系。
A novel unicellular red alga collected from a mangrove area on Iriomote Island in southwest Japan is described as Bulboplastis apyrenoidosa gen. et sp. nov. The cells are spherical, mean 11.2 mu m in diameter, and surrounded by a thick mucilaginous sheath. The grayish-green chloroplast has many lobes extending throughout the cell and lacks a pyrenoid. This chloroplast type is similar to Glaucosphaera vacuolata, but differs from other unicellular red algae. Plastoglobuli clusters occur beneath the chloroplast envelope but only at the cell periphery. A peripheral encircling thylakoid is absent. Golgi bodies surround the central nucleus, which is an arrangement shared with all members of the Dixoniellales. The subcellular features of some mitotic phases are quite similar to those of other unicellular red algae. A pair of ring-shaped structures located within electron-dense material can be seen in cells undergoing telophase. The size of the polar rings ranged within those reported from the Dixoniellales. A phylogenetic analysis based on small subunit rDNA indicates that B. apyrenoidosa is a member of the Dixoniellales and a sister lineage to Neorhodellaand Dixoniella.