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Research paper

Effect of Combined Chilling and GA3 Treatment on Bud Abortion in Forced ‘Luoyanghong’ Tree Peony (Paeonia suffruticosa Andr.)

Philip M.P. MORNYAa,b( ), Fangyun CHENGa
National Flower Engineering Research Center, College of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
School of Natural Resources Management, Njala University, Njala, Moyamba District, Private Mail Bag, Sierra Leone

Peer review under responsibility of Chinese Society for Horticultural Science (CSHS) and Institute of Vegetables and Flowers (IVF), Chinese Academy of Agricultural Sciences (CAAS)

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Abstract

This research investigated the effect of combined chilling and GA3 treatment on bud abortion of tree peony under greenhouse conditions to determine the dynamics of exogenous hormones and chilling effects on bud abortion. Research of such nature will increase the understanding of the effects of GA3 and chilling level on flower development thereby, promoting off-season cultivation techniques in tree peonies to increase production that meets market demand. Hormone and sugar levels in the ‘Luoyanghong’ tree peony were respectively determined using High-Performance Liquid Chromatography (HPLC) and spectrophotometer. Non-potted chilling with 200 mg·L−1 GA3 treatment reduced bud abortion rate. Flowering rate in non-potted chilling with 200 mg·L−1 GA3 plants was 58%, as against 21% in potted chilling plants with 200 mg·L−1 GA3 treatment. Sugar accumulation in retained or aborted flower buds was conversely related to ABA level. Low ABA and high sugar levels were noted in retained buds whereas the reverse induced bud abortion. ABA level apparently inhibited sucrose and reducing sugar uptake in aborted buds whereas GA3 enhanced sucrose uptake in retained buds. GA3 and IAA levels were higher in retained than in aborted buds, which made plants with retained bud more competitive in nutrient uptake (by root) for growth and development. Overall, combined chilling and GA3 treatment enhanced plant growth and development, particularly bud sprouting, growth and flowering.

Keywords

ABAhormonetree peonysugarbud abortionchillingGA3IAA

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Horticultural Plant Journal
Volume 4 Issue 6,
November 2018
Pages 250-256
DOI: 10.1016/j.hpj.2018.09.003
Cite this article:
MORNYA PM, CHENG F. Effect of Combined Chilling and GA3 Treatment on Bud Abortion in Forced ‘Luoyanghong’ Tree Peony (Paeonia suffruticosa Andr.). Horticultural Plant Journal, 2018, 4(6): 250-256. https://doi.org/10.1016/j.hpj.2018.09.003

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Received: 12 March 2018
Revised: 08 June 2018
Accepted: 31 August 2018
Published: 27 September 2018
© 2018 Chinese Society for Horticultural Science (CSHS) and Institute of Vegetables and Flowers (IVF), Chinese Academy of Agricultural Sciences (CAAS).

This is an open access article under the CC BY-NC-ND license. (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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