Nitrogen as a key regulator of flowering in <i>Fagus crenata</i>: understanding the physiological mechanism of masting by gene expression analysis

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  • Yuko Miyazaki
    Graduate School of Environmental Sciences Hokkaido University Sapporo 060‐0810 Japan
  • Yosuke Maruyama
    Graduate School of Life Science Hokkaido University Sapporo 060‐0810 Japan
  • Yukako Chiba
    Graduate School of Life Science Hokkaido University Sapporo 060‐0810 Japan
  • Masaki J. Kobayashi
    Institute of Evolutionary Biology and Environmental Studies Institute of Plant Biology University of Zurich CH‐8057 Zurich Switzerland
  • Benesh Joseph
    Institute of Evolutionary Biology and Environmental Studies Institute of Plant Biology University of Zurich CH‐8057 Zurich Switzerland
  • Kentaro K. Shimizu
    Institute of Evolutionary Biology and Environmental Studies Institute of Plant Biology University of Zurich CH‐8057 Zurich Switzerland
  • Keiichi Mochida
    Biomass Research Platform Team Biomass Engineering Program Cooperation Division RIKEN Center for Sustainable Resource Science Yokohama 230‐0045 Japan
  • Tsutom Hiura
    Tomakomai Experimental Forest Field Science Center of Hokkaido University Tomakomai 053‐0035 Japan
  • Hirokazu Kon
    Hokkaido Research Organization Forestry Research Institute Higashiyama Koshunai Bibai 079‐0198 Japan
  • Akiko Satake
    Graduate School of Environmental Sciences Hokkaido University Sapporo 060‐0810 Japan
  • Johannes Knops
    editor

書誌事項

公開日
2014-08-07
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/ele.12338
  • 10.5167/uzh-98023
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>The role of resource availability in determining the incidence of masting has been widely studied, but how floral transition and initiation are regulated by the resource level is unclear. We tested the hypothesis that floral transition is stimulated by high resource availabiltiy in <jats:italic>Fagus crenata</jats:italic> based on a new technique, the expression analyses of flowering genes. We isolated <jats:italic>F. crenata</jats:italic> orthologues of <jats:italic>FLOWERING LOCUS T</jats:italic>,<jats:italic> LEAFY</jats:italic> and <jats:italic>APETALA1</jats:italic>, and confirmed their functions using transgenic <jats:italic>Arabidopsis thaliana</jats:italic>. We monitored the gene expression levels for 5 years and detected a cycle of on and off years, which was correlated with fluctuations of the shoot‐nitrogen concentration. Nitrogen fertilisation resulted in the significantly higher expression of flowering genes than the control, where all of the fertilised trees flowered, whereas the control did not. Our findings identified nitrogen as a key regulator of mast flowering, thereby providing new empirical evidence to support the resource budget model.</jats:p>

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