| 摘要: |
| 杂交和多倍化是蕨类植物物种形成的主要机制,往往导致多倍体复合群的出现。同一复合群的成员在形态上具有明显的连续性与过渡性,复合群内部往往存在复杂的亲缘关系,给分类带来很大困难。傅氏凤尾蕨复合群是凤尾蕨属中分类学问题最为突出的复合群之一,成员间仅以植株的高度、羽片的大小、裂片间隙的大小、裂片先端的形状或孢子囊群的长短等细小的特征相区别。为确定该复合群某些成员的分类学位置,并理清成员间的亲缘关系,该研究选取了3个叶绿体DNA片段atpB、matK和trnL-F构建傅氏凤尾蕨复合群的系统发育树,并结合孢粉学证据,探讨该复合群成员间的亲缘关系。结果表明:百越凤尾蕨和傅氏凤尾蕨的关系最为密切,建议把百越凤尾蕨归并到傅氏凤尾蕨中; 硕大凤尾蕨与傅氏凤尾蕨的关系较远,但其孢子形态与傅氏凤尾蕨有一定重叠,两者的亲缘关系待深入研究; 线裂凤尾蕨是一独立的种,与该复合群其它成员明显不同; 隆林凤尾蕨都较早分化出来,单独作为一支,但其孢子形态多变,暗示其可能是杂种起源。 |
| 关键词: 傅氏凤尾蕨复合群, 分子系统学, 孢粉学, 亲缘关系 |
| DOI：10.11931/guihaia.gxzw201803053 |
| 分类号:Q949 |
| 文章编号:1000-3142(2019)05-0581-09 |
| Fund project:国家自然科学基金(31360042)[Supported by the National Natural Science Foundation of China(31360042)]。 |
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| Molecular systematics study on Pteris fauriei complex(Pteridaceae) |
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WANG Xiaojiao1, WANG Jiamei1, YANG Dongmei1*,
WANG Faguo2, CHEN Hongfeng2, LANG Yueting1
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1. College of Horticulture, Tropical College of Agriculture and Forestry, Hainan University, Haikou 570228, China;2. South China
Botanical Garden, Chinese Academy of Sciences/ Guangdong Provincial Key Laboratory of Applied Botany, Guangzhou 510650, China
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| Abstract: |
| Hybridization and polyploidation are the main machenisms of speciation of ferns, which lead to the formation of polyploid complexes. Members of the same complex have obvious continuity and transition in morphology, and the genetic relationships within the complex group are complicated, which cause much taxonomic confusion to ferns. Pteris fauriei complex is one of the most confusing complexes in Pteris. Members in this complex are highly similar in morohology and just classified by a few tiny characteristics, such as height of plant, size of pinnae, size of the gap in the lobes, the distance between segments and the leghth of sori and so on. In order to determine the taxonomic position of some members of the complex and clarify the genetic relationships among members, three chloroplast DNA fragments, atpB, matK, and trnL-F were selected to construct a phylogenetic tree of the Pteris fauriei complex. Based on the results from molecular systematics study and palynological study, the genetic relationships among members of the P. fauriei complex were discussed. The results showed that the relationship between P. fauriei var. chinensis and P. fauriei was very close, and we suggset to incorporate P. fauriei var. chinensis into P. fauriei. The relationship between P. majestica and P. fauriei was relatively far, but the spore morphology of P. majestica overlaps with that of P. fauriei. Therefore, their genetic relationship needs further study. P. angustipinnula is an independent species, different from other members of the complex. P. splendida was early differentiated as a separate branch, but its spore morphology was variable, suggesting that it may be a hybrid origin. |
| Key words: Pteris fauriei complex, molecular phylogeny, palynology, genetic relationship |
