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이소의,Ravi Gupta,Ramesha H. Jayaramaiah,이서현,Yiming Wang,박상렬,김선태 한국식물병리학회 2017 Plant Pathology Journal Vol.33 No.5
Xanthomonas oryzae pv. oryzae (Xoo), the causative agent of bacterial blight, is a major threat to rice productivity. Here, we performed RNA-Seq based transcriptomic analysis of Xoo transcripts isolated under in planta growth (on both susceptible and resistant hosts) and in vitro culture conditions. Our in planta extraction method resulted in successful enrichment of Xoo cells and provided RNA samples of high quality. A total of 4,619 differentially expressed genes were identified between in planta and in vitro growth conditions. The majority of the differentially expressed genes identified under in planta growth conditions were related to the nutrient transport, protease activity, stress tolerance, and pathogenicity. Among them, over 1,300 differentially expressed genes were determined to be secretory, including 184 putative type III effectors that may be involved in Xoo pathogenicity. Expression pattern of some of these identified genes were further validated by semi-quantitative RT-PCR. Taken together, these results provide a transcriptome overview of Xoo under in planta and in vitro growth conditions with a focus on its pathogenic processes, deepening our understanding of the behavior and pathogenicity of Xoo.
Evaluation of Bioactive Compounds in Strawberry Fruits by a Targeted Metabolomic Approach
Min Jung Ko,Ramesha H Jayaramaiah,Ravi Gupta,So Wun Kim,Jae Uk An,Ziyu Wang,Mae Li,Nam Jun Kang,Kwang-Pyo Hong,Jum-Soon Kang,Sun Tae Kim,Young Whan Choi 한국원예학회 2017 원예과학기술지 Vol.35 No.6
Strawberry (Fragaria ×ananassa Duch.) is referred to as a functional fruit because of its high nutritional value. Here, we used a targeted metabolomics approach to investigate the quantitative variation in strawberry bioactive compound concentration across cultivars and breeding lines and during fruit ripening. We also compared the efficiency of 95% ethyl alcohol (EtOH), 50% EtOH, and water in extracting these compounds. High-performance liquid chromatography (HPLC) and multivariate analysis revealed that 50% EtOH extracted bioactive compounds more efficiently than 95% EtOH and water. Screening of targeted bioactive compounds extracted with 50% EtOH in six cultivars and 28 breeding lines revealed high abundance of anthocyanins, flavonols, flavanols, and cinnamic acid, which constituted up to 6.4 mg·g<SUP>-1</SUP> of fresh weight of fruits. The highest concentration of phenolic compounds was observed in breeding lines ‘SB08’, ‘SB11’, ‘Arang’, ‘SB09’, and ‘SB10’. Furthermore, significant changes in the concentration of these compounds occurred during fruit ripening in four strawberry cultivars. Overall, our results highlight the chemotypic relationship between cultivars, breeding lines, and fruit ripening associated-changes in strawberries, and these findings provide a chemometric method for choosing optimal cultivars/breeding lines.
Lee, So Eui,Gupta, Ravi,Jayaramaiah, Ramesha H.,Lee, Seo Hyun,Wang, Yiming,Park, Sang-Ryeol,Kim, Sun Tae The Korean Society of Plant Pathology 2017 Plant Pathology Journal Vol.33 No.5
Xanthomonas oryzae pv. oryzae (Xoo), the causative agent of bacterial blight, is a major threat to rice productivity. Here, we performed RNA-Seq based transcriptomic analysis of Xoo transcripts isolated under in planta growth (on both susceptible and resistant hosts) and in vitro culture conditions. Our in planta extraction method resulted in successful enrichment of Xoo cells and provided RNA samples of high quality. A total of 4,619 differentially expressed genes were identified between in planta and in vitro growth conditions. The majority of the differentially expressed genes identified under in planta growth conditions were related to the nutrient transport, protease activity, stress tolerance, and pathogenicity. Among them, over 1,300 differentially expressed genes were determined to be secretory, including 184 putative type III effectors that may be involved in Xoo pathogenicity. Expression pattern of some of these identified genes were further validated by semi-quantitative RT-PCR. Taken together, these results provide a transcriptome overview of Xoo under in planta and in vitro growth conditions with a focus on its pathogenic processes, deepening our understanding of the behavior and pathogenicity of Xoo.