Park Sang Hee, Kim Jung Sung, Kim Hyoung Tae
Department of Forest Science, Chungbuk National University, Chungdae-ro 1, Chungbuk 28644, Korea.
Institute of Agricultural Science and Technology, Chungbuk National University, Chungdae-ro 1, Chungbuk 28644, Korea.
Plants (Basel). 2021 Jan 18;10(1):170. doi: 10.3390/plants10010170.
Ferns have conspicuous sporophytes as the dominant phase in their life cycle; however, the gametophytes are completely separated from the sporophytes and supply their own nutrition, unlike in bryophytes and seed plants. Among the gametophytes, some maintain their populations in the gametophyte phase without progressing to sporophyte production and are known as independent gametophytes. Independent gametophytes of Baker were recently reported in one population on Jeju Island, Korea. In the present study, we surveyed more places to find new independent gametophyte populations of using the gene sequence-based DNA barcoding technique. We identified two new sites inhabited by independent gametophytes. Archegonia and juvenile sporophytes were independently observed in each location under slightly different environmental conditions. Consequently, in the case of this species, functional sporophyte production is likely suppressed by prezygotic and postzygotic sterility, depending on microenvironmental factors.
蕨类植物在其生命周期中以显著的孢子体为主要阶段；然而，与苔藓植物和种子植物不同，其配子体与孢子体完全分离并自给营养。在配子体中，有些在配子体阶段维持种群数量而不发育为孢子体，被称为独立配子体。最近在韩国济州岛的一个种群中报道了贝克氏独立配子体。在本研究中，我们利用基于基因序列的DNA条形码技术调查了更多地点，以寻找新的独立配子体种群。我们确定了两个有独立配子体栖息的新地点。在略有不同的环境条件下，在每个地点都独立观察到了颈卵器和幼年孢子体。因此，对于该物种而言，功能性孢子体的产生可能受到合子前和合子后不育的抑制，这取决于微环境因素。
