Effects of gibberellin on early growth and fruiting of potted Betula platyphylla clones

WANG Chu, GU Chenrui, JIANG Jing, LIU Guifeng

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (5) : 16-22.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (5) : 16-22. DOI: 10.3969/j.issn.1000-2006.201902029

Effects of gibberellin on early growth and fruiting of potted Betula platyphylla clones

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Abstract

【Objective】 This study aimed to identify the best gibberellin treatment to increase the growth and fruiting ofBetula platyphylla. 【Method】 In this experiment, a birch clone was used as the research object and the ramets were treated with GA3 and GA4+7 at concentrations of 0.0, 0.2, 0.4 and 0.6 g/L. The test lasted for 3 years. In the second year, the rhythmicity of growth height was investigated. In the third year, the growth height, breast diameter, number of infructescences, fresh weight of infructescences and dry weight of seeds under each treatment were investigated. 【Result】 Analysis of variances of growth height, diameter at breast height, and fruit-bearing amount showed that the differences in growth height and fruit-bearing amount were significantly higher at different concentrations of GA3 and GA4+7(P < 0.01). Both GA 3 and GA4+7 can promote the growth and fruiting of B. platyphylla; however, the effect of GA4+7 is better. The optimal concentration was determined to be 0.4 g/L by comprehensive evaluation of growth height and fruit-bearing amount. Under this treatment, the growth height 13.69% was higher than that under the control, and the number of infructescences, fresh weight of infructescences, and dry weight of seeds increased by 203.6%, 186.8% and 187.2%, respectively. The growth height curve of B. platyphylla under each treatment accords with the “S” curve model. The fitting coefficients of the logistic equation under each treatment were all higher than 0.99. According to the parameters of the tree height growth model, the reason that gibberellin promotes the growth of B. platyphylla is mainly due to the prolongation of the fast growth period. 【Conclusion】 Both GA4+7 and GA3 promoted the growth and fruiting of B. platyphylla. GA4+7 was more efficacious than GA3. GA4+7 at 0.4 g/L is the best concentration and hormone to promote the growth of B. platyphylla.

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gibberellin / Betula platyphylla / early growth / fruiting / tree height

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WANG Chu , GU Chenrui , JIANG Jing , et al. Effects of gibberellin on early growth and fruiting of potted Betula platyphylla clones[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2019, 43(5): 16-22 https://doi.org/10.3969/j.issn.1000-2006.201902029

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