Methyl Jasmonate Treatment Enhanced Protodioscin Biosynthesis in White Asparagus (<i>Asparagus officinalis</i> L.) Spears

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  • Maeda Tomoo
    Faculty of Agriculture and Life Science, Hirosaki University
  • Jishi Tatsuru
    Graduate School of Environmental Science, Hokkaido University Kamikawa Agricultural Experiment Station
  • Komura Akinori
    Faculty of Agriculture and Life Science, Hirosaki University
  • Hasegawa Hiroki
    Faculty of Agriculture and Life Science, Hirosaki University
  • Narita Kaori
    Faculty of Agriculture and Life Science, Hirosaki University
  • Honda Kazushige
    Faculty of Agriculture and Life Science, Hirosaki University
  • Yamaguchi Takayuki
    Iwate Agricultural Research Center The United Graduate School of Agricultural Science, Iwate University

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  • ジャスモン酸メチル散布処理はホワイトアスパラガス若茎中のプロトディオシン生合成を高める

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Abstract

The objective of this study was to clarify the factors that influence saponin biosynthesis, with an emphasis on protodioscin, a major saponin compound in white asparagus spears. We investigated the effects of methyl jasmonate (MeJM) treatment on protodioscin content in white spears harvested by spring semi-forced and winter-forced cultivation. Protodioscin content was determined using high performance liquid chromatography equipped with an evaporative light scattering detector. Protodioscin was mainly localized in the lower region of the spears. In the spring semi-forced cultivation system using the film-cover method, the protodioscin content in white spears harvested from the MeJM plot was significantly higher than in those harvested from the control plot throughout the sampling period. MeJM also significantly enhanced protodioscin biosynthesis in a dose-dependent manner in the experiment conducted under winter-forced cultivation. These results suggest that saponin biosynthesis in white spears is associated with plant defensive reactions triggered by jasmonate. In addition, bitterness in film-covered white spears could be artificially controlled in commercial fields by MeJM treatment.<br>

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