A unique life cycle transition in the red seaweed Pyropia yezoensis depends on apospory.,Communications Biology

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A unique life cycle transition in the red seaweed Pyropia yezoensis depends on apospory.
Communications Biology ( IF 5.2 ) Pub Date : 2019-08-07 , DOI: 10.1038/s42003-019-0549-5
Koji Mikami ₁ , Chengze Li ₂ , Ryunosuke Irie ₂ , Yoichiro Hama ₃

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Plant life cycles consist of two temporally separated stages: a haploid gametophyte and a diploid sporophyte. In plants employing a haploid-diploid sexual life cycle, the transition from sporophyte to gametophyte generally depends on meiosis. However, previous work has shown that in the red seaweed Pyropia yezoensis, this transition is independent of meiosis, though how and when it occurs is unknown. Here, we explored this question using transcriptomic profiling of P. yezoensis gametophytes, sporophytes, and conchosporangia parasitically produced on sporophytes. We identify a knotted-like homeobox gene that is predominately expressed in the conchosporangium and may determine its identity. We also find that spore-like single cells isolated from the conchosporangium develop directly into gametophytes, indicating that the gametophyte identity is established before the release of conchospores and prior to the onset of meiosis. Based on our findings, we propose a triphasic life cycle for P. yezoensis involving production of gametophytes by apospory.

中文翻译：

红海藻条斑紫菜（Pyropia yezoensis）独特的生命周期转变取决于无孢子。

植物生命周期由两个暂时分离的阶段组成：单倍体配子体和二倍体孢子体。在采用单倍体-二倍体性生命周期的植物中，从孢子体到配子体的转变通常取决于减数分裂。然而，之前的研究表明，在红藻条斑紫菜中，这种转变与减数分裂无关，但如何以及何时发生尚不清楚。在这里，我们利用条斑紫菜配子体、孢子体和孢子体上寄生的壳孢子囊的转录组分析来探讨这个问题。我们鉴定了一种主要在壳孢子囊中表达的打结状同源盒基因，并可能确定其身份。我们还发现从壳孢子囊中分离出的类孢子单细胞直接发育成配子体，这表明配子体身份是在壳孢子释放之前和减数分裂开始之前建立的。根据我们的发现，我们提出了条斑紫菜的三相生命周期，涉及无孢子产生配子体。

更新日期：2019-08-07

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