Entwisle Timothy J, Evans Joshua R, Vis Morgan L, Saunders Gary W
Royal Botanic Gardens Victoria, Private Bag 2000, South Yarra, Victoria, 3141, Australia.
Department of Environmental and Plant Biology, Ohio University, Athens, Ohio, 45701, USA.
J Phycol. 2018 Feb;54(1):79-84. doi: 10.1111/jpy.12603. Epub 2017 Nov 20.
A new genus, Ottia, and family, Ottiaceae, are proposed within the Acrochaetiales to accommodate the uniseriate red algal endophyte of batrachspermalean taxa previously named Balbiania meiospora. Prior to this study, Balbiania investiens was transferred to its own family and order (Balbianiales) based on comparative DNA sequence data and a distinctive reproductive morphology. However, the second species described in this genus, B. meiospora, continued to be treated as a species of Audouinella (A. meiospora) pending further investigation. Phylogenetic analyses of sequence data confirmed only a distant relationship between the two endophytes, and a closer alliance of B. meiospora to Acrochaetiales. The data also showed that Ottia meiospora was the deepest diverging lineage in the Acrochaetiales, sister to all of the currently recognized genera and families. In this study, we review the classification of what we now call O. meiospora - reported from Australia, New Zealand and Brazil - based on sequence and morphological data. Morphological observations provided little clarity around the reproductive morphology or the life cycle of this endophyte of Nothocladus s. lat. found commonly in mainland Australia but, to date, less so in New Zealand.
在顶丝藻目中提出了一个新属——奥蒂藻属（Ottia）和一个新科——奥蒂藻科（Ottiaceae），以容纳先前被命名为中孢子巴尔比亚藻（Balbiania meiospora）的蛙藻类群的单列红色藻内生菌。在本研究之前，基于比较DNA序列数据和独特的繁殖形态，侵染巴尔比亚藻（Balbiania investiens）被归入其自己的科和目（巴尔比亚藻目）。然而，该属中描述的第二个物种，即中孢子巴尔比亚藻（B. meiospora），在进一步研究之前仍被视为奥杜因藻属（Audouinella）的一个物种（中孢子奥杜因藻，A. meiospora）。序列数据的系统发育分析仅证实了这两种内生菌之间的远缘关系，以及中孢子巴尔比亚藻与顶丝藻目更密切的联系。数据还表明，中孢子奥蒂藻（Ottia meiospora）是顶丝藻目中分化最深的谱系，是所有目前公认的属和科的姊妹群。在本研究中，我们基于序列和形态数据，对我们现在所称的中孢子奥蒂藻（据报道来自澳大利亚、新西兰和巴西）的分类进行了综述。形态学观察对于这种广义诺氏藻（Nothocladus s. lat.）内生菌的繁殖形态或生命周期几乎没有提供清晰的信息，这种内生菌在澳大利亚大陆很常见，但迄今为止在新西兰较少见。
