Evolutionaryanalyses of the nuclear-encoded photosynthetic gene psbO from tertiary plastid-containing algae in Dinophyta
Evolutionaryanalyses of the nuclear-encoded photosynthetic gene psbO from tertiary plastid-containing algae in Dinophyta
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甲藻门第三纪质体藻类核编码光合基因 psbO 的进化分析
DOI：
10.1111/j.1529-8817.2011.00961.x
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
H.
中科院分区：
文献类型：
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作者：
Yokoyama;A.;Takahashi;F.;Kataoka;H.,Hara;Y. & Nozaki;H.
Smith（1944）将熟悉的团藻属划分为VolvoxL.将7个在成体细胞之间缺乏胞质桥的物种置于Merrillosphaera组。本文描述了一种原产于美国得克萨斯州的团藻属（Volvox ovalisPocock ex Nozaki et A.）W.新种科尔曼（Coleman sp. nov.）卵圆形或椭圆形，具有1，000 - 2，000个体细胞的单层，这些体细胞不通过细胞质桥连接，前部区域扩大，后部区域有8-12个分生孢子。V中不发生明显的不对称分裂。卵形胚胎，因为他们做团藻carteriF。Stein、团藻Volvox obversus（W. Shaw）Printz和非洲团藻Volvox africanusG. S.西，所以下一代的分生孢子在V中还不能识别。倒位前的卵胚。对叶绿体5个基因和核rDNA内转录间隔区（ITS）的分子系统发育分析表明，V. ovalisis与团藻Volvox spermatosphaera Powers（Powers 1908，as“spermatosphara”）和/或第三团藻Volvox tertiusArt.梅。然而，V. ovalis可以与V. spermatosphaerabyits较大的分生孢子，并从V.第三，分生孢子叶绿体形态的明显差异。
Smith (1944) divided the familiar genusVolvoxL. into four sections, placing seven species that lacked cytoplasmic bridges between adult cells in the sectionMerrillosphaera. Herein, we describe a new member of the sectionMerrillosphaeraoriginating from Texas (USA):Volvox ovalisPocock ex Nozaki et A. W. Coleman sp. nov. Asexual spheroids ofV. ovalisare ovoid or elliptical, with a monolayer of 1,000–2,000 somatic cells that are not linked by cytoplasmic bridges, an expanded anterior region, and 8–12 gonidia in the posterior region. Visibly asymmetric cleavage divisions do not occur inV. ovalisembryos as they doVolvox carteriF. Stein,Volvox obversus(W. Shaw) Printz, andVolvox africanusG. S. West, so the gonidia of the next generation are not yet recognizable inV. ovalisembryos prior to inversion. Molecular phylogenetic analyses of the five chloroplast genes and the internal transcribed spacer (ITS) regions of nuclear rDNA indicated thatV. ovalisis closely related toVolvox spermatosphaeraPowers (Powers 1908, as “spermatosphara”) and/orVolvox tertiusArt. Mey.; however,V. ovaliscan be distinguished fromV. spermatosphaeraby its larger gonidia, and fromV. tertiusby visible differences in gonidial chloroplast morphology.