A New Morphological Type of Volvox from Japanese Large Lakes and Recent Divergence of this Type and V. ferrisii in Two Different Freshwater Habitats.
A New Morphological Type of Volvox from Japanese Large Lakes and Recent Divergence of this Type and V. ferrisii in Two Different Freshwater Habitats.
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DOI：
10.1371/journal.pone.0167148
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Kawachi M
中科院分区：
文献类型：
--
作者：
Nozaki H;Ueki N;Isaka N;Saigo T;Yamamoto K;Matsuzaki R;Takahashi F;Wakabayashi KI;Kawachi M
团藻属团藻组团藻属团本节的物种被发现从各种淡水栖息地。最近，根据分子生物学和形态学资料，对原产于稻田和沼泽的团藻组团藻属的3个种进行了分类学研究。然而，还没有进行分类学研究的培养材料，这一节起源于大型湖泊水体。利用日本两个大型湖泊和一个池塘的培养材料，研究了团藻属团藻组的一个新的形态类型。团藻属（Volvox sp. Sagami）是一种雌雄同株的有性球体，可能代表一个新的形态学种，它与团藻属团藻组（Volvox sect.）中所有已知的雌雄同株种的区别在于，其有性球体中的卵或合子数量少（5-25个），合子壁上有短而尖锐的刺（最长可达3 μm），无性球体中的前体细胞伸长。然而，基于核核糖体DNA的内转录间隔区（ITS）（rDNA; ITS-1、5.8S rDNA和ITS-2）和质体基因的序列，团藻Sagami谱系及其姊妹谱系（雌雄同株的种V. ferrisii）显示出非常小的遗传差异，这对应于其他团藻中单个生物种内的变异。由于费里斯团藻（V. ferrisii）与相模团藻（Volvox sp. Sagami）在有性球体中约有100-200个合子，合子壁上有长刺（6-8.5 μm），且生长在日本稻田中，这两个形态上不同的谱系可能在两种不同的淡水生境中迅速分化。此外，来自大型湖泊的团藻球形体的趋光性游泳速度显著高于来自水稻田的费里斯团藻，表明团藻对大型水体的适应性。
Volvox sect. Volvox is characterized by having unique morphological characteristics, such as thick cytoplasmic bridges between adult somatic cells in the spheroids and spiny zygote walls. Species of this section are found from various freshwater habitats. Recently, three species of Volvox sect. Volvox originating from rice paddies and a marsh were studied taxonomically based on molecular and morphological data of cultured materials. However, taxonomic studies have not been performed on cultured materials of this section originating from large lake water bodies. We studied a new morphological type of Volvox sect. Volvox (“Volvox sp. Sagami”), using cultured materials originating from two large lakes and a pond in Japan. Volvox sp. Sagami produced monoecious sexual spheroids and may represent a new morphological species; it could be clearly distinguished from all previously described monoecious species of Volvox sect. Volvox by its small number of eggs or zygotes (5–25) in sexual spheroids, with short acute spines (up to 3 μm long) on the zygote walls and elongated anterior somatic cells in asexual spheroids. Based on sequences of internal transcribed spacer (ITS) regions of nuclear ribosomal DNA (rDNA; ITS-1, 5.8S rDNA and ITS-2) and plastid genes, however, the Volvox sp. Sagami lineage and its sister lineage (the monoecious species V. ferrisii) showed very small genetic differences, which correspond to the variation within a single biological species in other volvocalean algae. Since V. ferrisii was different from Volvox sp. Sagami, by having approximately 100–200 zygotes in the sexual spheroids and long spines (6–8.5 μm long) on the zygote walls, as well as growing in Japanese rice paddies, these two morphologically distinct lineages might have diverged rapidly in the two different freshwater habitats. In addition, the swimming velocity during phototaxis of Volvox sp. Sagami spheroids originating from large lakes was significantly higher than that of V. ferrisii originating from rice paddies, suggesting adaptation of Volvox sp. Sagami to large water bodies.
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影响因子：
3.7
作者：
Nozaki H;Matsuzaki R;Yamamoto K;Kawachi M;Takahashi F
通讯作者：
Takahashi F
DOI：
10.1073/pnas.0811205106
发表时间：
2009-03-03
影响因子：
11.1
作者：
Herron, Matthew D.;Hackett, Jeremiah D.;Michod, Richard E.
通讯作者：
Michod, Richard E.
影响因子：
3.7
作者：
Hamaji T;Smith DR;Noguchi H;Toyoda A;Suzuki M;Kawai-Toyooka H;Fujiyama A;Nishii I;Marriage T;Olson BJ;Nozaki H
通讯作者：
Nozaki H
影响因子：
2.9
作者：
Solari, Cristian A.;Michod, Richard E.;Goldstein, Raymond E.
通讯作者：
Goldstein, Raymond E.
DOI：
10.1007/bf02491095
发表时间：
1983-01-01
期刊：
BOTANICAL MAGAZINE-TOKYO
影响因子：
--
作者：
NOZAKI, H
通讯作者：
NOZAKI, H