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논문 기본 정보

자료유형
학술저널
저자정보
Kwon, Eun Ji (Department of Agricultural Biotechnology, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University) Lee, Min Kyoung (Department of Agricultural Biotechnology, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University) Jeon, Hyesung (Department of Agricultural Biotechnology, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University) Hwang, Jae Min (Department of Agricultural Biotechnology, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University) Kim, Ju-Kon (Crop Biotechnology Institute, Green Bio Science and Technology, Seoul National University) Kim, Minkyun (Department of Agricultural Biotechnology, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University)
저널정보
한국응용생명화학회 Applied Biological Chemistry Applied Biological Chemistry 제59권 제4호
발행연도
2016.1
수록면
623 - 630 (8page)

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Among the many miRNAs involved in plant stress responses, miR399 is well known to be involved in controlling phosphate homeostasis by down-regulating the expression of PHO2, which encodes the ubiquitin-conjugating E2 enzyme, UBC24, in Arabidopsis. In this study, to understand the expression of the rice OsmiR399 genes under abiotic stress conditions, the expression of the eleven OsmiR399 (a-k) genes was studied by analyzing the levels of their precursor transcripts (pre-miRNAs) in the roots and shoots of rice seedlings subjected to the stress-responsive phytohormone abscisic acid (ABA). We found that the OsmiR399 genes showed different patterns in pre-miRNA accumulation. In particular, OsmiR399b, OsmiR399d, OsmiR399e, and OsmiR399f showed high and steady accumulation in both the roots and shoots regardless of ABA treatments. However, OsmiR399c and OsmiR399k showed ABA-induced expression in the whole plant body or aerial part of the rice seedlings. In addition, to test the possibility that the putative rice PHO2 ortholog of Arabidopsis, also known as LEAF TIP NECROSIS 1 (LTN1), might be down-regulated by the multiple OsmiR399s with certain sequence divergences, four different lines of transgenic rice plants that overexpress either the constitutively expressed OsmiR399s (OsmiR399d and OsmiR399f) or the ABA-inducible OsmiR399s (OsmiR399c and OsmiR399k) were produced and the levels of OsmiR399 pre-miRNAs and LTN1 transcripts were analyzed. A significant decrease in the accumulation of LTN1 transcripts and an increase in the OsmiR399 pre-miRNAs levels were found in all of the transgenic plants. Based on these results, we concluded that LTN1 is down-regulated by multiple OsmiR399 genes in rice.

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