Why does resin flow occur on the stem of conifers?

DOI Web Site 4 Citations 71 References
  • Kusumoto Dai
    Graduate School of Agricultural and Life Sciences, The University of Tokyo : (Present address) Center for Research on Wild Plants, Utsunomiya University

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  • 針葉樹の樹脂流出はなぜ起こる?
  • シンヨウジュ ノ ジュシ リュウシュツ ワ ナゼ オコル

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Many conifers form traumatic resin canals and secrete resin. Traumatic resin canal formation is induced by various stimuli, and involved in the prevention of the insect attack and fungal invasion. Traumatic resin canals are formed near the cambium either in xylem or in phloem, and both traumatic resin canals take 1 to 2 months to develop to maturity. Ethylene application can artificially induce the traumatic resin canal formation and enhance the resin production, suggesting that the stress ethylene, which is produced by conifers suffering stresses, is related with the traumatic resin canal system. Continual stimuli that are added by the activities of insects and fungi likely promote the ethylene production than temporary ones such as mechanical wounds, and increase the area of the traumatic resin canal distribution and the amount of secreted resin. Ethylene production is induced by abiotic stresses. There is a possibility that combination of biotic and abiotic stresses leads the conifers to copious ethylene production.

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