排序方式： 共有22条查询结果，搜索用时 515 毫秒
11.
利用冷冻切片技术,通过形态学和解剖学方法,对采自我国东海沿岸浙江南麂列岛的大型海洋红藻珊瑚藻目(Corallinales)的有节类群进行了分类学研究。经鉴定,共发现珊瑚藻目有节类群2属5种,分别为珊瑚藻科Corallinaceae叉节藻亚科Amphiroideae叉节藻属Amphiroa的带形叉节藻A.beauvoisii;珊瑚藻亚科Corallinoideae珊瑚藻属Corallina的鳞形珊瑚藻C.confusa、粗枝珊瑚藻C.crassisima、珊瑚藻C.officinalis和小珊瑚藻C.pilulifera。通过较为清晰的解剖学特征图片,对该5种有节珊瑚藻外部形态和内部特征进行了详细的比较与描述。结合近年来国际上有关上述部分物种的分类地位变化,对我国现存的带形叉节藻A.zanata、粗扁节藻Bossiella cretacea和大边孢藻Marginisporum crassissimum的归并问题展开了详细分析与讨论,以期促进对珊瑚藻目海藻分类学有更加深入的理解。 相似文献
12.
Laurencia nanhaiense sp.nov.(Rhodomelaceae,Rhodophyta) is described from Hainan and Guangdong Provinces,China.The new species clearly displays one of the defining features of the genus,viz.four periaxial cells per vegetative axial segment.It differs from other closely related species in having a combination of features such as terete axes from a basal system composed of a primary discoid holdfast and a secondary attachment to give rise to many short rhizoids,branching oppositely and alternately,irregularly tristichous or subverticillately polystichous,having more curve branches with very sparse,adventitious ultimate branchlets,non-projecting superficial cortical cells at the apices of ultimate branchlets,presence of longitudinally oriented secondary pit-connections between contiguous superficial cortical cells,absence of lenticular thickenings in the walls of medullary cells,parallel arrangement of tetrasporangia along the axis of stichidia,and presence of intercellular spaces between medullary cells. 相似文献
13.
The purpose of this study was to investigate the concentration levels of heavy metals in different species of the main three
marine algal divisions from the Gulf of Aden coastal waters, Yemen. The divisions included Chlorophyta—green plants (Halimeda tuna, Rhizoclonium kochiamum, Caldophora koiei, Enteromorpha compressa, and Caulerpa racemosa species), Phaeophyta—brown seaweeds (Padina boryana, Turbinaria elatensis, Sargassum binderi, Cystoseira myrica, and Sargassum boveanum species), and Rhodophyta—red seaweeds (Hypnea cornuta, Champia parvula, Galaxaura marginate, Laurencia paniculata, Gracilaria foliifere, and species). The heavy metals, which included cadmium (Cd), cobalt (Co), copper (Cu), chromium (Cr), Iron (Fe), manganese
(Mn), nickel (Ni), lead (Pb), zinc (Zn), and vanadium (V) were measured by Atomic Absorption Spectrophotometer (AAs). The
concentrations of heavy metals in all algal species are in the order of Fe >> Cu > Mn > Cr > Zn > Ni > Pb > Cd > V > Co. The
results also showed that the uptake of heavy metals by different marine algal divisions was in the order of Chlorophyta > Phaeophyta > Rhodophyta.
These heavy metals were several order of magnitude higher than the concentrations of the same metals in seawater. This indicates
that marine alga progressively uptake heavy metals from seawater. 相似文献
14.
Formation and early development of tetraspores of Polysiphonia urceolata (Rhodomelaceae, Rhodophyta)
Polysiphonia urceolata is one type of potential commercial red seaweeds used for breeding and cultivation, because of its significant biochemical and biomedical application. However, the information of breeding and seedling incubation for cultivation is limited, especially the early development. In this study, tetrasporohyte and gametophyte of P. urceolata were taken as the study materials in Huiquan Bay, Qingdao, China. The cleaned and sterilized tetrasporophytes and gametophytes were pre-cultured in sterilized seawater, then nurtured at 18℃, 25 μmol photons m-2 s-1 in 12:12 h (light:dark) photoperiod. Continuous observation under microscope showed that the early development consists of bipolar division stage and seedling stage. In the division stage, tetraspores germinate into bipolar sporelings that further differentiate into a colorless rhizoidal portion and a lightly pigmented upright shoot. The lightly pigmented rhizoidal cell develops to a rhizoid and the larger pigmented cell transforms to an erect axis. In the seedling stage, several quasi-protuberances appear on the erect axis and form juvenile seedlings. The results demonstrate the culture of P. urceolata from tetraspores under laboratory conditions. 相似文献
15.
In order to find out whether long interspersed elements (LINEs) existed in macro-algae ge- nomes or not, we tested the LINE homologues in representative families (species): Gracilaria (G. eucheumoides Harv., G. tenuistipitata Chang et Xia, and G. textorii (Sur) De-Toni), Laminaria (L. longis- sima Miyabe and L. japonica Aresch.), and Ulva (U. lactuca L. and U. pertusa Kjellm.) during 2004 to 2005. Polymerase Chain Reaction (PCR) was carried out with degenerate oligonucleotide primers de- signed from LINEs of rice homologues and Cin4 of maize. Cloning and nucleotide sequencing of the PCR products revealed that 4 clones that derived from 3 species of Gracilaria have LINE homologues. The nucleotide sequences of the 4 LINE homologues diverged greatly, but the amino acid sequences deduced from them were relatively conserved. The endonuclease regions of the LINE homologues greatly di- verged from that of other plants, but they had closer phylogenetic relationship to Zepp elements in Chlor- ella sp., which indicated that sequence divergence by vertical transmission has been a major influence on the evolution of algal LINEs. 相似文献
16.
龙须菜(Gracilaria lemaneiformis)选育品系及其野生型的ISSR指纹分析 总被引：13，自引：2，他引：13
采用ISSR标记对龙须菜一个野生型群体和选育品系两个不同年代的栽培群体，进行了亲缘关系分析，构建了龙须菜选育品系的指纹图谱。通过实验从22个ISSR引物中筛选出16条引物，可以产生清晰稳定及可重复的带，共扩增出118个位点；野生型和选育品系两个群体的遗传相似率分别为0．7301、0．7189，选育品系的两养殖种群间的遗传相似率为0．9375；遗传距离聚类分析证明，龙须菜选育品系与其青岛野生型亲缘关系很近。7条引物产生的12条特异片段可用于龙须菜选育品系的种质鉴定，每条引物都能将龙须菜选育品系和其野生型分开；根据引物S848扩增的位点构建了指纹图谱，可用于区分龙须菜选育种群及野生种群。 相似文献
17.
利用形态学和解剖学方法, 对采自海南省东南和西南沿海的大型海洋红藻江蓠属(Gracilaria)进行了分类学研究。经鉴定, 共发现4个物种, 即凤尾菜G. eucheumoides、芋根江蓠G. blodgettii、缢江蓠G. salicornia和刺边江蓠G. spinulosa。文章对此4种江蓠的内、外部形态特征进行了较详细描述与介绍。结合生物冷冻切片技术, 获得了各个物种的比较清晰的解剖学特征图片。其中, 缢江蓠藻体表面瘤状突出物, 与其他文献报道的同体蓠生藻Gracilariophila deformans Weber-van Bosse相一致。 相似文献
18.
This paper deals with vegetative reproduction by multicellular propagules in Rhodophyta. An extensive examination of the relevant literature shows that this phenomenon in Rhodophyta is not well known. A propagule is here defined as a vegetative multicellular structure which spontaneously detaches from the parent thallus and gives rise to a new individual. The origin and morphological features of multicellular propagules are examined in the various known propagule‐forming species. The importance of multicellular propagules as both overwintering and resting organs and as a taxonomic feature is also shown. Their role in increasing local populations and/or for long‐distance dispersal is discussed. The relative abundance of vegetative reproduction by multicellular propagules versus sexual reproduction, as well as the advantages of this additional mode of reproduction, are shown and discussed. The production of multicellular propagules may contribute to the capacity of species to increase populations, to weather unpredictable environmental changes, to survive in conditions that would be lethal for entire thalli, and to reach new habitats. As resting organs, they may also be responsible for long‐distance dispersal and may account for the introduction of some alien species. Accordingly, propagule‐forming species are probably more competitive than taxa that do not produce such propagules. These considerations should be taken into account in future studies of the biology, ecology and demography of Rhodophyta. 相似文献
19.
The rhodophyte Compsopogon coeruleus (Balbis ex C. Agardh) Montagne is newly recorded from Fiji, South Pacific. Plants occur in dense masses in the Wainivesi River in the province of Tailevu. Local villagers collect the plants and use them to cook a “pudding” with tinned fish, very similar to “puddings” prepared by coastal Fijians using marine species such as Gracilaria and Hypnea. This is the first documented account of the use of Compsopogon as a gelling agent in the preparation of human food. 相似文献
20.