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Jeong Gu Lee,Min Hye Park,Myung Sook Kim,Tae-Gu Lee,Ha-il Jung,Sangho Jeon 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.4
Soil organic matter (SOM) is an important indicator of soil fertility, health and quality. For proper managements of agricultural fields, a long-term monitoring of changes in SOM contents in field and estimation of national accumulation of SOM are required. In this study, SOM in agricultural fields of paddy and upland systems were investigated from 2013 to 2020 for all administrative provinces of South Korea. Total field area was decreased by 4.8% and 9.1% in 2016 and 2020, respectively, compared to 2013. In paddy field, SOM content was 27.9 g kg<SUP>-1</SUP> in 2013, which was gradually increased by 1.1% in 2020. Despite that SOM content increased at a field scale, national SOM accumulation in paddy fields decreased due to reduced paddy area. In upland fields, SOM content was gradually increased by 6.5% from 2013 to 2020. Though SOM content increased, however, SOM accumulation in the total agricultural field at national scale was not affect due to less area than paddy field area. Therefore, total SOM accumulation was continuously decreased from 69.2 Tg in 2013 to 65.3 Tg in 2020 mainly due to decreasing paddy field area. This study showed that in spite of the SOM increase of both fields, national SOM accumulation is decreased with significantly decreasing total field area. Therefore, it is required to increase SOM accumulation at a field scale through proper management of SOM. In addition, it is also necessary to conserve paddy fields to enlarge agricultural SOM at national scale.
Jeong Gu Lee,Kyeonglim Min,Kyuweon Lee,Eun Jin Lee 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Multidisciplinary approaches are necessary to gain insight into the postharvest effects at the molecular and biochemical levels. Integrating genomics, proteomics, and metabolomics would offer a greater understanding of the comprehensive qualitative and quantitative plant responses to external stimuli. We used combined transcriptomic and metabolomic approaches to investigate the molecular and cellular responses and to find genes and metabolism related postharvest quality of pepper and strawberry fruit for comprehensive understanding of improved fruit storability. Pepper (Capsicum annuum L.) fruit is sensitive to temperatures below 10°C, which severely diminish fruit quality during cold chain distribution. Seed browning was a major chilling symptom in 36 genotypes of C. annuum fruit screened after storage at 2°C for 3 weeks. Analyses of integrated transcriptome-metabolome and relative gene expression in seeds obtained from the two genotypes were conducted to identify key factors involved in the seed browning induced by chilling. Transcriptome identification showed 3,140 differentially expressed genes affected by chilling between the two genotypes. Particularly, genes related to jasmonic acid synthesis and signaling were differentially expressed. A regulatory network of jasmonic acid synthesis and signaling, and regulation of ERF family genes might contribute to chilling response in pepper fruit. Fruit ripening and senescence influence strawberry fruit quality and postharvest storability, and have been intensively studied. However, genetic and physiological differences among cultivars preclude consensus understanding of these processes. We therefore performed a meta-analysis by mapping existing transcriptome data to the newly published and improved strawberry reference genome and extracted meta-differentially expressed genes (meta-DEGs) from six cultivars to provide an expanded transcriptomic view of strawberry ripening. We identified cultivar-specific transcriptome changes in anthocyanin biosynthesis-related genes and common changes in cell wall degradation, chlorophyll degradation, and starch metabolism-related genes during ripening. We also identified 483 meta-DEGs enriched in gene ontology categories related to photosynthesis and amino acid and fatty acid biosynthesis that had not been revealed in previous studies. We conclude that meta-analysis of existing transcriptome studies can effectively address fundamental questions in plant sciences.
Jeong Gu Lee,Ji Eun Seo,Eun Jin Lee 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Capsicum annuum is sensitive to chilling stress and chilling injuries occur below 7°C. However, there are differences in the temperature at which chilling injuries occur depending on the genotype. This study was conducted to identify the factors affecting chilling sensitivity in Capsicum annuum. A total 112 of F2 fruits, from cross between chilling insensitive ‘UZB-GJG-1999-51’ and chilling sensitive ‘C00562’, were grouped according to the seed browning rate, which is a typical chilling symptom of Capsicum fruit under chilling condition. After that, physiological traits, amino acids, fatty acids, and gene expression levels of ethylene responsive factors (ERF), dehydration responsive element-binding factor (DREB) and jasmonate resistant 1 (JAR1) were analyzed, and their correlations with the seed browning rate were confirmed. The gene expression level of JAR1 showed a strong negative correlation with the seed browning rate (r = ‒0.7996). The expression levels of ERF11, DREB3 and contents of hydrogen peroxide showed strong positive correlations with the seed browning rates of r = 0.7622, 0.4229, and 0.6607, respectively. From these results, it was inferred that JAR1, ERF11, and DREB3 were important factors influencing the chilling sensitivity of Capsicum annuum and our results will help to select pepper fruit, paprika, and bell pepper cultivar for long term storage and distribution market.