Vegetative and reproductive morphology of Nemastoma damaecorne (Gigartinales, Rhodophyta) from Western Australia
Vegetative and reproductive morphology of Nemastoma damaecorne (Gigartinales, Rhodophyta) from Western Australia
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西澳大利亚 Nemastoma damaecorne（Gigartinales，Rhodophyta）的营养和生殖形态
DOI：
10.1071/sb97047
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Huisman
中科院分区：
文献类型：
--
作者：
J. Huisman
研究了红藻Nemastoma damaecorne Harvey （Gigartinales）的营养和生殖形态。菌体变平和各种分枝，或具卵裂边缘增生或深切。在结构上，菌体是多轴的，有丝状的髓质和皮层，后者亚二分分支，斜向，并包含大的钙间腺细胞。植物雌雄同株，精囊形成于外皮层细胞上。Carpogonial分支是三细胞的，由内皮层细胞产生。在假定的受精之后，绒珠部与附近的辅助细胞融合，后者产生几个分枝的连接细丝。生殖辅助细胞是经转化的皮层间细胞。连接的细丝与生殖辅助细胞融合并继续生长。成性腺细胞起源于生殖辅助细胞的上表面，形成一个完全由车胎囊组成的车胎体。四孢子植物是未知的，但在培养中，碳孢子的萌发模式表明一种硬壳习性。这些结果表明，该物种被错误地放置在Nemastoma中，而更接近于Platoma属。此外，将N. damaecorne与已发表的Platoma cyclocolpum (Montagne) Schmitz的描述进行比较表明，这两个物种是同种的，因此前者被认为是后者的异型同义词。
The vegetative and reproductive morphology of the red alga Nemastoma damaecorne Harvey (Gigartinales) have been examined. Thalli are flattened and variously branched, either foliose with marginal proliferation or deeply incised. Structurally, the thallus is multiaxial, with a filamentous medulla and cortex, the latter subdichotomously branched, anticlinally directed, and incorporating large, intercalary gland cells. Plants are monoecious, with spermatangia formed on outer cortical cells. Carpogonial branches are three-celled and borne on an inner cortical cell. Following presumed fertilization, the carpogonium fuses with nearby subsidiary auxiliary cells—the latter producing several branched connecting filaments. Generative auxiliary cells are transformed intercalary cortical cells. Connecting filaments fuse with generative auxiliary cells and continue growth. The gonimoblast initial arises from the upper surface of the generative auxiliary cell and forms a carposporophyte composed entirely of carposporangia. Tetrasporophytes are unknown, but the germination pattern of carpospores in culture suggests a crustose habit. These results indicate that the species is incorrectly placed in Nemastoma and conforms more closely to the genus Platoma. Furthermore, a comparison between N. damaecorne and published descriptions of Platoma cyclocolpum (Montagne) Schmitz suggests that the two species are conspecific, and as such the former is regarded as an heterotypic synonym of the latter.