Mechanisms for transmission of short-day information to root via vascular system and acquisition of tolerance to winter environment in deciduous woody plant

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K06698
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 44030:Plant molecular biology and physiology-related
• Research Institution: University of Tsukuba
• Principal Investigator: Satoh Shinobu 筑波大学, 生命環境系, 教授 (70196236)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 落葉樹 / 短日 / microRNA / 篩管 / 根 / 成長 / 導管液 / 休眠

Outline of Final Research Achievements

In poplar, a deciduous tree, bud dormancy is induced by short-day (SD) via abscisic acid in autumn, but the root dormancy was controlled by some microRNAs synthesized in leaves under SD transported through sieve tube in addition to abscisic acid. We focused on certain microRNAs and created their defective mutants and analyzed the root elongation. Moreover, RNA-seq was performed in poplar roots under LD and SD, and expression kinetics of 37271 genes were analyzed.

Free Research Field

植物生理学

Academic Significance and Societal Importance of the Research Achievements

落葉樹は冬季環境に適応するために秋に休眠に入る。芽の休眠は秋の短日によって誘導されることが知られるが、根の成長や機能がどの様に制御されているかは分かっていなかった。本研究により、葉が受けた短日の情報が根に伝わる仕組みと根の機能制御の一端が解明された。