Abstract：
:The mangrove fern genus Acrostichum grows in the extremely unstable marine intertidal zone under harsh conditions, such as high salt concentrations, tidal rhythms and long-term climate changes. To explore the phylogenetic relationships and molecular mechanisms underlying adaptations in this genus, we sequenced the transcriptomes of two species of Acrostichum, A. aureum and A. speciosum, as well as a species in the sister genus, Ceratopteris thalictroides. We obtained 47,517, 36,420 and 60,823 unigenes for the three ferns, of which 24.39-45.63% were annotated using public databases. The estimated divergence time revealed that Acrostichum adapted to the coastal region during the late Cretaceous, whereas the two mangrove ferns from the Indo West-Pacific (IWP) area diverged more recently. Two methods (the modified branch-site model and the Kh method) were used to identify several positively selected genes, which may contribute to differential adaptation of the two Acrostichum species to different light and salt conditions. Our study provides abundant transcriptome data and new insights into the evolution and adaptations of mangrove ferns in the inhospitable intertidal zone.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zhang Z,He Z,Xu S,Li X,Guo W,Yang Y,Zhong C,Zhou R,Shi Sdoi
10.1038/srep35634subject
Has Abstractpub_date
2016-10-26 00:00:00pages
35634issn
2045-2322pii
srep35634journal_volume
6pub_type
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