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Stephanandra incisa is a typical discontinuous distribution species in the eastern part of the subspecies with a high economic and ecological value. In this study, we have obtained the complete chloroplast genome of S. incisa using high-throughput sequencing. The chloroplast genome length was 159,583 bp, the AT content was 63.7%, while the large single copy and a small single copy area were 88,018 bp and 18,817 bp, respectively. It contains 131 genes, including 86 protein-coding genes, 37 transfer RNA genes, and eight ribosomal RNA genes. A maximum-likelihood phylogenetic tree supported the fact that S. incisa is closely related to Pyracantha fortuneana and Amelanchier sinica, which is consistent with the taxonomic view.

Developmental processes and biomass allocation of a multi-stemmed shrub, Stephanandra incisa, were measured to reveal the advantages of a multi-stemmed growth form on matter production. Stephanandra incisa is a low shrub species that mainly grows in the forest understory. The current-year shoots become shorter by yearly branching that effectively increases the allocation ratio to photosynthetic organs. The frequency distribution of relative current-year shoot length (the ratio of current-year shoot length to stem length) in each ramet (a stem and its crown) of a clump (genet) were skewed to larger length classes in younger ramets and gradually skewed to shorter length classes in older ramets. The biomass allocation ratio of non-photosynthetic organs to photosynthetic organs in ramets changed from a declining trend to a rising trend as the age of the ramets increased. The biomass allocation ratios of ramets and clumps increased with their size, but the ratio of clumps showed lower values than that of ramets of the same size. The age and size structures of ramets in clumps contributed to the narrow variability of the biomass allocation ratio. Stephanandra incisa showed a high biomass allocation ratio to leaves and maintained the ratio with a multi-stemmed growth form. [ABSTRACT FROM AUTHOR]

Stephanandra incisa is a typical discontinuous distribution species in the eastern part of the subspecies with a high economic and ecological value. In this study, we have obtained the complete chloroplast genome of S. incisa using high-throughput sequencing. The chloroplast genome length was 159,583 bp, the AT content was 63.7%, while the large single copy and a small single copy area were 88,018 bp and 18,817 bp, respectively. It contains 131 genes, including 86 protein-coding genes, 37 transfer RNA genes, and eight ribosomal RNA genes. A maximum-likelihood phylogenetic tree supported the fact that S. incisa is closely related to Pyracantha fortuneana and Amelanchier sinica , which is consistent with the taxonomic view., Competing Interests: No potential conflict of interest was reported by the author(s)., (© 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)