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Plastid Phylogenetics, Biogeography and Character Evolution of the Chinese Endemic Genus Sinojackia Hu.
Version 1
: Received: 8 May 2024 / Approved: 9 May 2024 / Online: 13 May 2024 (04:31:54 CEST)
A peer-reviewed article of this Preprint also exists.
Jian, X.; Wang, Y.; Li, Q.; Miao, Y. Plastid Phylogenetics, Biogeography, and Character Evolution of the Chinese Endemic Genus Sinojackia Hu. Diversity 2024, 16, 305. Jian, X.; Wang, Y.; Li, Q.; Miao, Y. Plastid Phylogenetics, Biogeography, and Character Evolution of the Chinese Endemic Genus Sinojackia Hu. Diversity 2024, 16, 305.
Abstract
Sinojackia Hu. comprises five to eight Chinese endemic species with high ornamental and medicinal value. However, the generic limits, interspecific relationships and evolutionary history of the genus remain unresolved. In this study, we newly sequenced and assembled three plastomes of S. oblongicarpa and compared them with those of the other congeneric species to explore the taxonomic delimitation of the species and the evolutionary history of the genus. Plastomes structure of Sinojackia species were extremely conserved in terms of number of genes, sequence length and GC content. Codon usage patterns revealed that natural selection may be the main factor shaping codon usage bias. Our phylogenetic tree shows that Sinojackia is monophyletic and can be divided into two clades. Sinojackia oblongicarpa as a distinct species is supported for it is distantly related to S. sarcocarpa. The evolutionary analysis of morphological features indicates that woody mesocarp is an ancestral feature, while mesocarp undeveloped, spongy and fleshy are the later derived. Sinojackia originated in Central-Southeast China during the early Miocene. In this period, it experienced elevated diversification and migrated from the Central-Southeast China to Hunan Province and Sichuan Province with the development of the Asian monsoon and East Asian flora. Sinojackia experienced elevated diversification at intraspecies levels that mainly occurred in the Quaternary. Glacial-interglacial interactions with the monsoon climate may provide favorable expansion conditions for Sinojackia on a small-scale.
Keywords
Sinojackia; Plastome; Species delimitation; Evolutionary history
Subject
Biology and Life Sciences, Forestry
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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