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4 November 2019 Mitochondrial genome from Andreaea wangiana reveals structural conservatism and a trend of size reduction in mosses
Wen-Zhuan Huang, Wen-Zhang Ma, Harald Schneider, Ying Yu, Yu-Huan Wu
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Abstract

To further reveal the structural characteristics of moss mitochondrial genomes from the still unexplored orders, we sequenced and assembled the mitogenome from the granite moss Andreaea wangiana (Andreaeaceae, Andreaeales). The newly generated genome consisted of 117,857 base pairs with an average GC content of 42%. The gene contents and gene order were found to be identical to those previously published from mosses, reconfirming the hypothesis of structural conservatism in this lineage. Comparison of the newly generated mitogenome with those published suggested an evolutionary trend towards size reduction of mitogenomes across the tree of mosses. The pattern was largely caused by hierarchical loss of introns and/or shortening of intergenic spacers. We found evidence to support a positive correlation between GC content and genome size in bryophytes. Furthermore, we identified 233 putative RNA editing sites for all protein-coding genes and 60 simple sequence repeats in this mitogenome. By reporting the complete mitogenome from an important early diverging lineage of mosses, this study provided valuable data for further studies to explore the mechanisms maintaining the stability of genome structure during nearly 400 Ma of independent adaptation to changing terrestrial environments. The study further identified a few highly variable regions that could be used as DNA markers to clarify the genetic diversity of granite moss populations.

Copyright © 2019 by The American Bryological and Lichenological Society, Inc.
Wen-Zhuan Huang, Wen-Zhang Ma, Harald Schneider, Ying Yu, and Yu-Huan Wu "Mitochondrial genome from Andreaea wangiana reveals structural conservatism and a trend of size reduction in mosses," The Bryologist 122(4), 597-606, (4 November 2019). https://doi.org/10.1639/0007-2745-122.4.597
Received: 13 June 2019; Accepted: 1 October 2019; Published: 4 November 2019
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KEYWORDS
Andreaeaceae
reduction of mitogenome size
RNA editing sites
Setaphyta
simple repeat sequence
structural conservatism
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