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Amphithallia, a genus with four-celled carpogonial branches and connecting filaments in the Corallinales (Rhodophyta)
Marine Biology Research ( IF 1.1 ) Pub Date : 2019-05-02 , DOI: 10.1080/17451000.2019.1598559
Athanasios Athanasiadis 1
Affiliation  

The South African marine alga Amphithallia crassiuscula, previously subsumed in the widely reported Synarthrophyton patena, is here re-described as a distinct species and genus. Thalli grow as obligate epiphytes on Gelidium capense in the upper sublittoral zone (while S. patena grows on Ballia callitricha). Gametophytes are monoecious with four-celled carpogonial branches and sterile cells are borne on supporting cells (dioecious or hermaphroditic with two or three-celled carpogonial branches and sterile cells borne on hypogynous cells in Synarthrophyton). Postfertilization stages involve a connecting filament linking the carpogonium to several putative auxiliary cells, demonstrating a non-procarpic condition with apparent absence of a fusion cell. Gonimoblast filaments develop at the level of basal cells of carpogonial branches. Spermatangial mother cells remain either unbranched (cutting off spermatangia only) or develop dendroid (branched) filaments with terminal spermatangia (as in Synarthrophyton). Multiporate conceptacles develop straight pore canals lined by non-differentiated cells (conical canals with differentiated pore cells along the base in Synarthrophyton). The here described pre- and post-fertilization characters are new for the order Corallinales motivating the establishment of the new genus Amphithallia.



中文翻译:

Amphithallia,属四细胞类矢状分支,在Corallinales(Rhodophyta)中有连接细丝的属

南非海藻Amphithallia crassiuscula,以前被广泛报道于Synarthrophyton patena中,现在被重新描述为独特的物种和属。塔里(Thalli)作为专生的附生植物在滨海上亚带的盖兰Gelidium capense)上生长(而帕特纳酵母S. patena)Ballia callitricha上生长)。配子体是单性的,具有四细胞的矢状分支,无菌细胞在支持细胞上繁殖(雌雄同体或雌雄同体的细胞具有两或三细胞的矢状分支,而无菌细胞则在同生植物中的雌性细胞上繁殖)。受精后的阶段包括将filament骨与几个假定的辅助细胞连接的连接细丝,这表明在非掌皮状态下明显没有融合细胞。成胶质细胞细丝在颈分支的基底细胞水平上发育。精原细胞母细胞保持不分支(仅切除精原细胞)或发育具有终生精原细胞的树突状(分支状)细丝(如Synarthrophyton)。多孔概念棘形成直的孔道,内衬未分化的细胞(圆锥形的根管,在Synarthrophyton的基部具有分化的孔道细胞)。此处描述的受精前和受精后的特征对于Corallinales顺序是新的促使Amphithallia属建立的顺序

更新日期:2019-05-02
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