The cell wall galactans from Australian representatives of the genus Meristotheca (Solieriaceae, Rhodophyta)
The cell wall galactans from Australian representatives of the genus Meristotheca (Solieriaceae, Rhodophyta)
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来自澳大利亚分生藻属（Solieriaceae，Rhodophyta）代表的细胞壁半乳聚糖
DOI：
10.2216/i0031-8884-42-6-572.1
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发表时间：
2003
期刊：
影响因子：
1.6
通讯作者：
G. Kraft
中科院分区：
文献类型：
--
作者：
N. Watt;A. Chiovitti;D. Craik;G. Kraft
摘要角叉菜科是角叉菜目中属数最多的科（16 ~ 18个）。其中一个属，分生藓属，由三到四种卵叶植物组成，直立或匍匐的植物偶有记录，来自两个半球的热带地区。本文采用成分分析、连锁分析、傅里叶变换红外光谱和13c核磁共振波谱等方法，对澳大利亚典型种M. papulosa和M. procumbens的水溶性多糖进行了表征。结果表明，两种植物的多糖结构相似，主要由4-链3,6-无羟基-α- d -半乳糖- 2-硫酸糖和3-链β- d -半乳糖- 4-硫酸糖交替组成，这是典型的ι-卡拉胶。小比例的3链单元以丙酮化残基4,6- o -（l-羧乙基乙基）-β- d -半乳糖糖的形式出现，并且还检测到与理想的i -卡拉胶的其他微小变化。Meristotheca代表的多糖与迄今为止分析的其他水藻的多糖相当，但微小的结构差异表明，与水藻科的非水藻属（如Sarconema， Solieria和Tikvahiella）的化学分类亲和力更接近于水藻科的Eucheuma属，Kappaphycus属和Betaphycus属（Eucheumatoideae族），后者是大多数κ-和κ-卡拉胶的商业提取来源。
Abstract The Solieriaceae has the largest number of genera (16–18) of any family in the carrageenophyte order Gigartinales. One of these genera, Meristotheca, consists of three or four species of foliose, erect to prostrate plants sporadically recorded from the tropics of both hemispheres. The hot-water-soluble polysaccharides from Australian representatives of the type species, M. papulosa, and M. procumbens from Lord Howe Island have been characterized by compositional assays, linkage analysis, and Fourier transform infrared and 13C-nuclear magnetic resonance spectroscopy. The results show that polysaccharides from both species are similar, being predominantly composed of 4-linked 3,6-anhydro-α-D-galactopyranose 2-sulphate alternating with 3-linked β-D-galactopyranose 4-sulphate, as is typical of ι-carrageenan. Small proportions of the 3-linked units occur as the pyruvated residue 4,6-O-(l-carboxyethylidene)-β-D-galactopyranose, and other minor variations from idealized ι-carrageenan were also detected. The polysaccharides from representatives of Meristotheca are comparable to those of other solieriacean algae analysed to date, but the minor structural variations suggest a closer chemotaxonomic affinity with noneucheumoid genera of the Solieriaceae, such as Sarconema, Solieria, and Tikvahiella, than to the eucheumoid genera Eucheuma, Kappaphycus and Betaphycus (tribe Eucheumatoideae) from which most κ- and ι-carrageenans are commercially extracted.