Research Project
Grant-in-Aid for Scientific Research (C)
In this study, we focused on the adaptation mechanisms of baldcypress (Taxodium distichum) to the various water environments. In order to identify genes responsible for the adaptation, we performed transcriptome analyses for root and leaf tissues of baldcypress seedlings grown up for 2 weeks under the five conditions, dry, flooding, low salt (1 ppt, 5 ppt), and high salt (10 ppt). The analyses revealed that the expression of genes for transcription factors, ion channels, transporters, and oxidoreductase have immediately increased under the environmental stress. Within two weeks, the up-regulation of genes for modification of cell walls, leaf senescence growth control and biosynthesis of secondary metabolites, and down-regulation of genes for photosynthesis and respiration were observed.
本研究では、様々な環境下での遺伝子発現の経時変化の解析から、ヌマスギが季節的もしくは突発的におこる生息環境変化に対し、即時的な応答だけでなく、細胞の代謝活性抑制、二次代謝生成、細胞壁構造の改変、葉の老化など、漸次の応答を行い個体の生存を維持していることを遺伝子レベルで検証することができた。これは、これまであまり知られていない針葉樹の環境適応のメカニズムと適応的形質の進化過程を考えるうえで重要な知見となる。
All 2019 2018 2017 2016
All Journal Article (4 results) (of which Int'l Joint Research: 1 results, Peer Reviewed: 4 results, Open Access: 1 results, Acknowledgement Compliant: 1 results) Presentation (4 results)
Tree Genetics & Genomes
Volume: 15 Issue: 6 Pages: 77-77
10.1007/s11295-019-1386-x
Heredity
Volume: - Issue: 3 Pages: 371-383
10.1038/s41437-019-0198-y
Scientific Reports
Volume: 7 Issue: 1 Pages: 2377-2377
10.1038/s41598-017-02630-2
American Journal of Botany
Volume: 103 Issue: 11 Pages: 1937-1949
10.3732/ajb.1600046
