2023 Fiscal Year Final Research Report

Clarifying relationship between juvenile and mature sugi clones in water relations parameters

Research Project

PDF

Project/Area Number	20K06132
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 40010:Forest science-related
Research Institution	Forest Research and Management Organization
Principal Investigator	Kawai Yoshie 国立研究開発法人森林研究・整備機構, 森林総合研究所林木育種センター, 主任研究員等 (20370851)
Co-Investigator(Kenkyū-buntansha)	池田武文京都府立大学, 生命環境科学研究科, 特任教授 (50183158) 市榮智明高知大学, 教育研究部自然科学系農学部門, 教授 (80403872)
Project Period (FY)	2020-04-01 – 2024-03-31
Keywords	スギ / 幼老相関 / 水分生理特性 / 精英樹 / 系統間変異
Outline of Final Research Achievements	The results of an analysis of the relationship between sugi water relation characteristics and morphological characteristics obtained from sapling drying experiments and growth and survival in test stands showed that superior winter osmoregulatory function, i.e., higher winter drought tolerance, is associated with better growth and survival in matured stands. We measured winter osmoregulatory function in three mature test stands in the three production areas and verified the relationship between juvenile and mature clones. The carbon stable isotope ratios showed a positive correlation in both Hyogo and Ehime forests where measurements were made. Based on these results, we hypothesized that the water relation characteristics of sugi show juvenile-mature relationship and are effective as an indicator for selecting superior individuals because of their influence on adaptation in matured stands.
Free Research Field	森林遺伝育種
Academic Significance and Societal Importance of the Research Achievements	本研究は成長と生存の間で、林分間での系統順位変動の大きさやその経時的パターンが異なることを示しており、この結果は造林時のスギ系統選択の上で重要な示唆を与える。また本研究に先立ち筆者らは、スギさし木幼苗を用いて成長や生存の内的要因である生理特性には系統間に違いがある事を示してきた。本研究はこれまでの成果を発展させ、水分生理特性における異なる成育段階間の共通性（幼老相関）の存在を示すとともに、幼苗で評価した系統の水分生理特性と壮齢林における成長・生存との関連を明らかにした。これらの成果は、今後の林木育種で優良個体の早期選抜ツールとして水分生理特性を活用する上での基盤情報となる知見である。