The Possible Relationship between Ethylene and Polyamine Metabolism during the Flower Opening and Senescence, and their Effect on Flower Longevity in Hibiscus syriacus L.

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  • Seo Sang-Gyu
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • Kobayashi Katsuichiro
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • Fujihara Shinsuke
    Graduate School of Life and Environmental Sciences, University of Tsukuba Research Team for Soil and Plant Analysis, National Agricultural Research Center

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Other Title
  • ムクゲの花の開花および老化過程におけるエチレン，ポリアミンの代謝ならびにそれらが花弁の老化に及ぼす影響
  • ムクゲ ノ ハナ ノ カイカ オヨビ ロウカ カテイ ニ オケル エチレン ポリアミン ノ タイシャ ナラビニ ソレラ ガ カベン ノ ロウカ ニ オヨボス エイキョウ

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Abstract

In the higher plants, S-adenosylmethionine (SAM) synthesized from methionine serves as a common substrate for the biosynthesis of ethylene and polyamine. To clarify the relationship of ethylene and polyamine metabolism during the anthesis and senescence of Hibiscus syriacus L. flowers, ethylene production and changes in the concentration of 1-aminocyclopropane-1-carboxylic acid (ACC), ACC-conjugate, and polyamines in the petal were examined. A very low level of ACC was detected in the petal, and a very low ethylene evolution was observed, even before flower opening. Ethylene production greatly increased just around the beginning of petal in-rolling and paralleled an increase of ACC-conjugate in the petal. With regard to polyamine concentration, spermine decreased with petal senescence in contrast to the sharp rise in ethylene production. Aminoethoxyvinylglycine, which is a potent inhibitor of ACC synthesis from SAM and thereby represses ethylene formation, extended the flower longevity and maintained a high spermine concentration in the petal. In contrast, methylglyoxal-bis (guanylhydrazone), which is a potent inhibitor of SAM decarboxylation and also inhibits spermine biosynthesis, promoted ethylene production and shortened the flower longevity. These findings suggest that a competition for SAM between ethylene and polyamine biosynthesis may play a key role in determining flower longevity in H. syriacus L.<br>

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