Rhizophora complete chloroplast genome sequences

Historical processes of long-distance migration and ocean-wide expansion feature the global biogeographic pattern of Rhizophora species. Throughout the Indian Ocean, R. stylosa and R. mucronata appear as a young phylogenetic group with expansion of R. mucronata towards the Western Indian Ocean (WIO) driven by the South Equatorial Current. Nuclear microsatellites revealed genetic patterns and breaks, however, estimating propagule dispersal routes requires maternally inherited cytoplasmic markers. Here, we examine the phylogeography of 21 R. mucronata provenances across a >4,200 km coastal stretch in the WIO using R. stylosa as outgroup. Full length chloroplast genome (164,474 bp) and nuclear ribosomal RNA cistron (8,033 bp) sequences were assembled. Boundaries, junction point, sequence orientation and stretch between LSC/IRb/SSC/IRa/LSC showed no differences with the R. stylosa chloroplast genome. A total of 58 mutations in R. mucronata encompassing transitions/transversions, insertio...

红树属（Rhizophora）物种的全球生物地理格局，由长距离迁徙与全洋域扩张的历史进程塑造。在整个印度洋海域，红树（Rhizophora stylosa）与尖瓣红树（Rhizophora mucronata）构成一个年轻的系统发育类群，其中尖瓣红树在南赤道流（South Equatorial Current）的驱动下向西印度洋（Western Indian Ocean, WIO）扩张。核微卫星标记已揭示了相关遗传格局与遗传断裂，但要准确估算繁殖体的扩散路径，仍需借助母系遗传的细胞质标记。本研究以红树为外类群（outgroup），对西印度洋沿岸超过4200公里的海岸分布带内的21个尖瓣红树种源开展系统地理学研究。本研究组装得到全长164474 bp的叶绿体基因组（chloroplast genome）与8033 bp的核核糖体RNA顺反子序列。红树叶绿体基因组的大单拷贝区（Large Single Copy, LSC）、反向重复区b（Inverted Repeat b, IRb）、小单拷贝区（Small Single Copy, SSC）、反向重复区a（Inverted Repeat a, IRa）至大单拷贝区的边界、交界位点、序列方向及区间长度均未发现差异。尖瓣红树中共存在58处突变，涵盖转换/颠换、插入突变……