Abstract
Curcuma is of high economic value, credited to its medicinal, edible, and ornamental properties, which possess all signatures of adaptability, and rapid radiation, especially species of Curcuma (Chinese Curcuma, a recent Qinghai–Tibetan Plateau diversification genera) scattered in China. However, little is known about the incongruent phylogenetic signals within this genera from different inheritance patterns that will militate against the further development of this genera. In this research, we applied complete chloroplast genome data together with double-digest restriction site-associated DNA sequencing data (ddRAD-seq) strategy to investigate phylogenetic signals of Chinese Curcuma species, clustering using two RAD analysis pipelines (STACKS and pyRAD). Phylogenetic trees were obtained from each locus based on the maximum likelihood (ML) and multispecies coalescent (BEAST) methods. For visual comparison, multi-method and different datasets were used to infer the phylogeny. We discovered inconsistent relationships for the Chinese Curcuma with varying degrees of support using different methods and datasets.
Highlights
Rapid diversification is common in natural landscapes, such as mountain ranges and archipelagos [1]
Based on account of oil cells, vascular bundles, and xylem vessels, Chinese Curcuma can be divided into three groups (Group I: C. kwangsiensis and C. exigua, Group II: C. xanthorrhiza, C. longa, and C. sichuanensis, Group III: C. wenyujin, C. aromatica, C. phaeocaulis, C. zedoaria, and C. yunnanensis) [18]
Based on some key identification features of Chinese Curcuma, it can be divided into three groups (Group I: C. longa, C. sichuanensis, C. wenyujin, and C. xanthorrhiza; Group II: C. kwangsiensis and C. exigua; Group III: C. aromatica, C. chuanyujin, C. zedoaria, C. phaeocaulis, and C. yunnanensis) [19]
Summary
Rapid diversification is common in natural landscapes, such as mountain ranges and archipelagos [1]. The intense uplift of the Qinghai–Tibetan Plateau (QTP) and adjoining mountain ranges are one of these natural landscapes rich in biodiversity resources providing numerous foods and herbs [2,3,4,5,6]. Based on account of oil cells, vascular bundles, and xylem vessels, Chinese Curcuma can be divided into three groups (Group I: C. kwangsiensis and C. exigua, Group II: C. xanthorrhiza, C. longa, and C. sichuanensis, Group III: C. wenyujin, C. aromatica, C. phaeocaulis, C. zedoaria, and C. yunnanensis) [18]. Based on some key identification features of Chinese Curcuma (hair distribution, stoma density, and epidermal cells in leaf), it can be divided into three groups (Group I: C. longa, C. sichuanensis, C. wenyujin, and C. xanthorrhiza; Group II: C. kwangsiensis and C. exigua; Group III: C. aromatica, C. chuanyujin, C. zedoaria, C. phaeocaulis, and C. yunnanensis) [19]. It is necessary to use new techniques to classify them in a clear criteria principle
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