Study on tension wood formation by the distribution analysis of the amount of ethylene precursor ACC in tissues around the cambium

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K06172
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 40020:Wood science-related
• Research Institution: University of Miyazaki
• Principal Investigator: KIJIDANI YOSHIO 宮崎大学, 農学部, 教授 (10295199)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 引張あて材 / 植物ホルモン

Outline of Final Research Achievements

We examined the role of plant hormones in tension wood formation in three hardwoods (Castanopsis sieboldii, Quercus myrsinifolia, Liriodendron tulipifera). The amounts of auxin (IAA) and abscisic acid were different between upper and lower part of bending stem during tension wood formation in three hardwoods. The amounts of ethylene precursor (ACC) were different between upper and lower part of bending stem during tension wood formation in the two hardwoods (G layer in tension wood), however the amounts of ACC had no difference in stem positions in Liriodendron tulipifera (no G layer in tension wood). The application of exogenous ACC to Castanopsis sieboldii could not induce tension wood formation, but differentiation of axial parenchyma cells and amounts of cytokinin precursors. IAA movements increased lower part of bending stem during tension wood formation in Castanopsis sieboldii. The interaction of plant hormones might induce tension wood formation.

Free Research Field

木材組織・材質

Academic Significance and Societal Importance of the Research Achievements

あて材の細胞壁ミクロフィブリル傾角と細胞壁主成分の含有率は正常材に比べて大きく異なる。ミクロフィブリル傾角は、木材の物理的性質に影響をおよぼす重要な材質指標である。樹木がどのように細胞壁形成を制御しているのかを理解する上で、あて材形成は極めて興味深い研究対象である。また、針葉樹人工林のみでは、木材需要の変化に対応できず外国産材に国内需要を今以上に奪われる。近年、国産早生広葉樹による木材生産の可能性が注目されており、スダジイは日本の主要な広葉樹材資源である。広葉樹人工林導入には木部形成の基礎的知見が必要である。本研究で得られた成果は、木材材質の制御や広葉樹林業促進に貢献できる知見である。