Asparagus (Asparagus officinalis L.) and its Phylogenetic Positon within Asparagales
- 1. Department of Biological Technology, Nanchang Normal University, China
Abstract
Asparagus (Asparagus officinalis L.) is a horticultural homology of medicine and food with health care. The entire chloroplast (cp) genome of asparagus was sequenced with Hiseq4000 platform. The complete cp genome maps a circular molecule of 156,699bp built with a quadripartite organization: two inverted repeats (IRs) of 26,531bp, separated by a large single copy (LSC) sequence of 84,999bp and a small single copy (SSC) sequence of 18,638bp. A total of 112 genes comprising of 78 protein-coding genes, 30 tRNAs and 4 rRNAs were successfully annotated, 17 of which included introns. The identity, number and GC content of asparagus cp genes were similar to those of other asparagus species genomes. Analysis revealed 81 simple sequence repeat (SSR) loci, most composed of A or T, contributing to a bias in base composition. A maximum likelihood phylogenomic evolution analysis showed that asparagus was closely related to Polygonatum cyrtonema that belonged to the genus Asparagales. The availability of the complete cp genome sequence of asparagus provides valuable information for chloroplast genetic engineering and phylogenetic analyses in Asparagales.