1,2位に二重結合を有する高生理活性型ジベレリンの生合性

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Gibberellin A_3 type gibberellins possessing 1,2-double bond as well as 3β-hydroxyl exhibit high biological activity. The biosyntheses of these gibberellins were discussed based on the endogenous gibberellin profiles in immature seeds of Prunus persica and inflorescences of Ornithogalum thyrsoides. In P. persica, some GA_3 type gibberellins, GA_3,GA_<30>, GA_<68>, and GA_<87>, were identified. While 1,2-didehydro analogues of GA_9, GA_<20>, GA_<69>, GA_<70>, and GA_<77> (GA_<120>, GA<95>, GA<122>, GA<121>, and GA_<126>, respectively) were identified, these 2,3-didehydro analogues, which have been thought to be precursors of GA_3 type gibberellins, could not be detected. GA_3, GA<30>, and GA_<87> were thought to be biosynthesized by 3β-hydroxylation without double bond rearrangement from GA_<95> (3-deocy GA_3), GA_<121> (3-deoxy GA_<30>), and GA_<126> (3-deocy GA_<87>), respectively. The presence of GA_9 and the absence of GA_<20>, GA<69>, GA_<70>, and GA_<77> as endogenous gibberellins suggested that the loss of 1- and 2- hydrogen could happen in GA_9 to yield GA_<120> and then GA_<120> could be metabolized to other 1,2-didehydro gibberellins. Furthermore, two other novel gibberellins, GA_<118> (1α-hydroxy GA_<20>) and GA<119> (1α-hydroxy GA_9) were identified. In 0. thyroides, another GA_3 type gibberellin, GA_7 was identified with GA_9 and GA_<120> (3-deoxyo GA_7) but 2,3-didehydro GA_9 was not detected,. It was thought that GA_7 might be biosynthesized from GA_9 though GA_<120> as a direct precursor.
植物化学調節学会の論文
2000-11-02

1,2位に二重結合を有する高生理活性型ジベレリンの生合性

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