Gibberellic Acid Effect on Growth and Flowering of Ajania Pacifica /Nakai/ Bremer et Humphries
2013
Zalewska Małgorzata | Antkowiak Małgorzata
The research addressed the effect of gibberellic acid (GA3) on growth and flowering of Ajania pacifica /Nakai/ Bremer et Humphries ‘Bea’. The vegetative growth lasted for 8 weeks in glasshouse, under natural long day and from August 15 - under natural short day. The plants were divided into four groups: 1 - the plants sprayed with distilled water (control combination); 2, 3 and 4 - the plants sprayed with GA3 ones, twice and thrice, respectively, starting from the 5th week of growth, and then in the 6th and 7th week, successively. Each of the group was divided into two subgroups: the first one treated with GA3 at concentration of 250 mg·dm-3 and the second with 500 mg·dm-3. It was observed that double spraying with GA3 accelerated the buds development of Ajania pacifica, thus shortened the cultivation time by about two days. Treatment with GA3 at concentration 500 mg·dm-3 stimulated the elongation of shoots more than treatment with GA3 at 250 mg·dm-3. The plants sprayed twice were longer than the control and then those sprayed one time. However, elongation of shoots was not remarkable; corymbs were shorter, narrower, and contained lesser number of inflorescences. The present study indicates the specificity of the response of Ajania pacifica to GA3 treatment, which appears to be different from other ornamental species.
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