Inhibition of Flower Bud Formation in Betula platyphylla and Betula pendula by Gibberellin (GA_3) Application

概要

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Birch (Betula) trees produce a large amount of pollen, which is a cause of serious pollinosis. To control the pollen scattering, we examined the inhibitory effect of gibberellin (GA_3) on flower bud formation of birch. Field-grown trees of Betula pendula, nine years of age, were treated with a foliar spray of GA_3 (1, 10, and 100 mg L^<-1>), Betula platyphylla trees, 17-23 years of age, were treated with a stem injection of GA_3 (5, 50, and 500 mg per plant) in June or July, 1998. Male flower buds were not observed at the top of new shoots in June, but were observed in July. The number of inflorescence that emerged from randomly sampled branches was counted the next spring. The foliar spray of GA_3 in June at the dose of 10 or 100 mg L^<-1> decreased the number of inflorescence. Stem injection in June at a dose higher than 50 mg per plant completely inhibited flower bud formation, although it increased bud mortality in some trees. The most effective dose of GA_3 for stem injection to inhibit flower bud formation was between 0.04 and 0.44 mg per cm^2 of stem cross-section area at breast height. These results indicate that GA_3, applied during the period of floral differentiation markedly inhibits flower bud formation in birch.
一般社団法人日本森林学会の論文
2000-05-16