Abstract
Jujube (family Rhamnaceae) is an important economic fruit tree in China. In this study, we reported 26 chloroplast (cp) sequences of jujube using Illumina paired-end sequencing. The sequence length of cp genome was 161, 367–161, 849 bp, which was composed of a large single-copy region (89053–89437 bp) and a small single-copy region (19356–19362 bp) separated by a pair of reverse repeat regions (26478–26533 bp). Each cp genome encodes the same 130 genes, including 112 unique genes, being quite conserved in genome structure and gene sequence. A total of 118 single base substitutions (SNPs) and 130 InDels were detected in 65 jujube accessions. Phylogenetic and haplotype network construction methods were used to analyze the origin and evolution of jujube and its sour-tasting relatives. We detected 32 effective haplotypes, consisting of 20 unique jujube haplotypes and 9 unique sour–jujube haplotypes. Compared with sour–jujube, jujube showed greater haplotype diversity at the chloroplast DNA level. To cultivate crisp and sweet fruit varieties featuring strong resistance, by combining the characteristics of sour-jujube and cultivated jujube, three hybrid combinations were suggested for reciprocal crosses: “Dongzao” × “Jingzao39,” “Dongzao” × “Jingzao60,” “Dongzao” × “Jingzao28.” This study provides the basis for jujube species’ identification and breeding, and lays the foundation for future research.
Highlights
Jujube (Ziziphus jujuba Mill.) is woody plant native to China, distributed throughout the country, that has been cultivated thousands of years there, and is grown across Asia, Europe, and the Americas (Guo et al, 2011)
The chloroplast genome sizes of the 65 jujube materials analyzed in this study are shown in Supplementary Table 3
The sequence lengths of the 65 chloroplast genomes were very similar, and their GC content almost the same. These chloroplast genome sequences have been added to the Sequence Read Archive (SRA) under accession number (Supplementary Table 3)
Summary
Jujube (Ziziphus jujuba Mill.) is woody plant native to China, distributed throughout the country, that has been cultivated thousands of years there, and is grown across Asia, Europe, and the Americas (Guo et al, 2011). Jujube fruit is sweet and rich in vitamin C. Chinese jujube has important economic value as a food and a resource for the production of medicines and other health-promoting products (Shan et al, 2019; Rashwan et al, 2020; Sabri et al, 2021). There are extremely rich germplasm resources for jujube, the lack of improved varieties remains a limiting factor for its industrial development (Chang, 2018; Liu P. et al, 2020). 261 are suitable fresh-eating varieties, 224 are dried-fruit varieties, 159 are concurrent varieties and 56 candied date varieties. None of these varieties were obtained through cross breeding, having instead been selected from local
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
