Brassica oleracea contains various morphotypes within the species, but genomic signatures differentiating each morphotype have been poorly understood of. Here, we utilized whole genome sequence data of 44 B. oleracea collections including those of seven different morphotypes such as cabbage, broccoli, cauliflower, kailan, kale, brussels sprout, and kohlrabi to elucidate the genomic signature of B. oleracea morphotypes. Molecular structure analysis divided the 44 B. oleracea lines into two groups: group I represents broccoli, cauliflower, kailan; group II represents other B. oleracea subspecies. Kohlrabi has admixed genomic structure through genetic admixture analysis. Based on the population stratification result, we have investigated genetic signatures that offer the possible evolutionary processes for the kohlrabi morphotype. Several statistical analyses were implemented to identify selective regions and explore 45 candidate loci that may contribute to stem swollen in kohlrabi. Above all, we identified two kohlrabi-unique genes, LOC106333915 and LOC106308097, showing kohlrabi-unique non-synonymous mutations, which might be candidate genes for stem swollen in kohlrabi.

Rhus chinensis is a shrub widely distributed in Asia. It has been used for traditional medicine and ecological restoration. Here, we report the complete chloroplast genome sequence of two R. chinensis genotypes collected from China and Korea. The assembled chloroplast genome of Chinese R. chinensis is 149,094 bp long, consisting of a large single copy (97,246 bp), a small single copy (18,644 bp) and a pair of inverted repeats (16,602 bp). Gene annotation revealed 77 protein coding genes, 30 tRNA genes, and 4 rRNA genes. A phylogenomic analysis of the chloroplast genomes with 11 known complete chloroplast genomes clarified the relationship of R. chinensis with the other plant species in the Sapindales order. A comparative chloroplast genome analysis identified 170 SNPs and 85 InDels at intra-species level of R. chinensis between Chinese and Korean collections. Based on the sequence diversity between Korea and Chinese R. chinensis plants, we developed three DNA markers useful for genetic diversity and authentication system. The chloroplast genome information obtained in this study will contribute to enriching genetic resources and conservation of endemic Rhus species.

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Resource plants are important and have strong potential for a variety of utilities as crops or pharmaceutical materials. However, most resource plants remain wild and thus their utility for breeding and biotechnology is limited. Molecular markers are useful to initiate genetic study and molecular breeding for these understudied resource plants. We collected various wild collections of Peucedanum japonicum which is indigenous resource plants utilized as oriental medicine and leafy vegetables in Korea. In this study, we produced two independent whole genome sequences (WGSs) from two collections and identified large scale polymorphic simple sequence repeat (pSSR) based on our pipeline to develop SSR markers based on comparison of two WGSs. We identified a total of 452 candidate pSSR contigs. To confirm the accuracy and utility of pSSR, we designed ten SSR primer pairs and successfully applied those to seven collections of P. japonicum. The WGS and pSSR candidates identified in this study will be useful resource for genetic research and breeding purpose for the valuable resource plant, P. japonicum.

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Most ginseng cultivars bear red berry and only one cultivar ‘Gumpoong’ (GU) bears golden berry. GU is an elite cultivar bred by pedigree selection from a golden berry landrace (a mixed population) ‘Hwangsook’ (HS). We developed three unique polymorphic markers from complete chloroplast genome sequences of GU and HS. A population of GU showed uniform band amplicon against three chloroplast markers whereas HS population displayed mixed genotypes for both GU and HS. Using the characteristics of mixed genotypes in HS population, we developed a convenient method to differentiate GU and HS population by application of pooled DNA template for PCR analysis (pooling method). The pooling method revealed that the GU pool was identical with GU genotype while the HS pool showed both GU and HS genotype. The pooling method is a cost and time effective method for accurate authentication of both golden berry ginseng cultivars. The method is useful to protect GU products from its tentative counterfeits from seeds to mature plant stages as well as processed root products.

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