The complete chloroplast genome of Microcycas calocoma (Miq.) A. DC. (Zamiaceae, Cycadales) and evolution in Cycadales

PeerJ

article

Aimee Caye G. Chang¹  Qiang Lai¹  Tao Chen²  Tieyao Tu¹  Yunhua Wang²  Esperanza Maribel G. Agoo⁴  Jun Duan¹  Nan Li² 

[1] South China Botanical Garden, Chinese Academy of Sciences;Shenzhen Fairy Lake Botanical Garden, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Department of Biology, De La Salle University

关键词: Microcycas;    cpDNA;    Chloroplast genomes;    Cycadales;    Phylogeny;    Zamiaceae;    Cycads;    Evolution;    Plastids;   

DOI  :  10.7717/peerj.8305

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Cycadales is an extant group of seed plants occurring in subtropical and tropical regions comprising putatively three families and 10 genera. At least one complete plastid genome sequence has been reported for all of the 10 genera except Microcycas, making it an ideal plant group to conduct comprehensive plastome comparisons at the genus level. This article reports for the first time the plastid genome of Microcycas calocoma70% ML and = 1.0 BPP), confirms that Microcycas is closest to Zamia and forms a monophyletic clade with Ceratozamia and Stangeria. While Stangeria joined the Neotropical cycads Ceratozamia, Zamia and Microcyas, Bowenia grouped with the Southern Hemisphere cycads Encephalartos, Lepidozamia and Macrozamia. All Cycas species formed a distinct clade separated from the other genera. Dioon, on the other hand, was outlying from the rest of Zamiaceae encompassing two major clades—the Southern Hemisphere cycads and the Neotropical cycads. Analysis of the whole cp genomes in phylogeny also supports that the previously recognized family—Stangeriaceae—which contained Bowenia and Stangeria, is not monophyletic. Thus, the cp genome topology obtained in our study is congruent with other molecular phylogenies recognizing only a two-family classification (Cycadaceae and Zamiaceae) within extant Cycadales.

【 授权许可】

CC BY