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Wang Yang,Song Guoying,Liang Dong,Xia Hui,Zhang Huifen,Luo Xian,Deng Qunxian 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.5
Jujube fruits contain high levels of ascorbic acid (AsA). However, the AsA contents of fruits differ significantly in various jujube germplasm resources, and the factors responsible for these differences remain unknown. To explore the metabolic mechanism of AsA accumulation, we investigated the AsA content in fruits at different developmental stages of two jujube species, Ziziphus acidojujuba cv. Yuanxingxiaosuanzao (SZ) and Ziziphus jujuba Mill. cv. Luojiangtiaoyuanzao (LZ). The AsA accumulation pattern in the fruits of the two jujube species was similar during fruit development, and AsA content was negatively correlated with titratable acid. We also analysed the expression patterns of AsA metabolism genes. The results showed that AsA biosynthesis in jujube fruits was mainly related to the L-galactose pathway, as well as the inositol pathway. Furthermore, higher expression levels of genes involved in AsA biosynthesis (GME1, GMP1, GPP, GGP, and MIOX1) and regeneration (MDHAR1 and MDHAR2) were associated with higher AsA concentrations in SZ fruit compared with LZ fruit. In summary, we concluded that more efficient AsA biosynthesis and regeneration was responsible for the higher AsA accumulation in SZ fruit.
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Liu Qian,Fan Guoying,Wu Kui,Bai Xiangning,Yang Xi,Song Wentao,Chen Shengen,Xiong Yanwen,Chen Haiying 한국미생물학회 2022 The journal of microbiology Vol.60 No.7
Two novel Gram-positive, non-spore-forming, facultatively anaerobic, non-motile, and short rods to coccoid strains were isolated from the feces of the greater white-fronted geese (Anser albifrons) at Poyang Lake. The 16S rRNA gene sequences of strains 4H37-19T and 3HC-13 shared highest identity to that of Corynebacterium uropygiale Iso10T (97.8%). Phylogenetic and phylogenomic analyses indicated that strains 4H37-19T and 3HC-13 formed an independent clade within genus Corynebacterium and clustered with Corynebacterium uropygiale Iso10T. The average nucleotide identity and digital DNA-DNA hybridization value between strains 4H37-19T and 3HC-13 and members within genus Corynebacterium were all below 95% and 70%, respectively. The genomic G + C content of strains 4H37-19T and 3HC-13 was 52.5%. Diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), phosphatidylinositol (PI), phosphatidylcholine, and phosphatidyl inositol mannosides (PIM) were the major polar lipids, with C18:1ω9c, C16:0, and C18:0 as the major fatty acids, and MK-8 (H4), MK-8(H2), and MK-9(H2) as the predominant respiratory quinones. The major whole cell sugar was arabinose, and the cell wall included mycolic acids. The cell wall peptidoglycan contained meso-diaminopimelic acid (meso-DAP). The polyphasic taxonomic data shows that these two strains represent a novel species of the genus Corynebacterium, for which the name Corynebacterium poyangense sp. nov. is proposed. The type strain of Corynebacterium poyangense is 4H37-19T (=GDMCC 1.1738T = KACC 21671T).
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