期刊
GENOME BIOLOGY AND EVOLUTION
卷 5, 期 7, 页码 1403-1407出版社
OXFORD UNIV PRESS
DOI: 10.1093/gbe/evt099
关键词
chloroplast genome; core leptosporangiates; schizaeoid ferns; heterosporous ferns; ndhB; intragenic rate heterogeneity
资金
- National Natural Science Foundation of China [30970290, 31070594, 31000171]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KSCX2-EW-J-20, KSCX2-YW-Z-0940]
- Basic Research Project of the Department of Science and Technology of Zhuhai city, China [2012D0401990031]
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences
Previous studies have shown that core leptosporangiates, themost species-rich group of extant ferns (monilophytes), have a distinct plastid genome (plastome) organization pattern from basal fern lineages. However, the details of genome structure transformation from ancestral ferns to core leptosporangiates remain unclear because of limited plastome data available. Here, we have determined the complete chloroplast genome sequences of Lygodium japonicum(Lygodiaceae), a member of schizaeoid ferns (Schizaeales), and Marsilea crenata (Marsileaceae), a representative of heterosporous ferns (Salviniales). The two species represent the sister and the basal lineages of core leptosporangiates, respectively, for which the plastome sequences are currently unavailable. Comparative genomic analysis of all sequenced fern plastomes reveals that the gene order of L. japonicum plastome occupies an intermediate position between that of basal ferns and core leptosporangiates. The two exons of the fern ndhB gene have a unique pattern of intragenic copy number variances. Specifically, the substitution rate heterogeneity between the two exons is congruent with their copy number changes, confirming the constraint role that inverted repeats may play on the substitution rate of chloroplast gene sequences.
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