Effect of The Ecological Regions and Gibberellic Acid (GA3) Application on Growth and Flower Development of Rhynchostylis gigantea (Lindley) Rindley

Date Received: 19-08-2014

Date Accepted: 10-10-2014

Date Published: 06-08-2025

##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2014.12.7.

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Issue: Vol. 12 No. 7 (2014)

Section:

KỸ THUẬT VÀ CÔNG NGHỆ

How to Cite:

Dinh, D., Dong, D., & Quy, T. (2025). Effect of The Ecological Regions and Gibberellic Acid (GA3) Application on Growth and Flower Development of Rhynchostylis gigantea (Lindley) Rindley . Vietnam Journal of Agricultural Sciences, 12(7), 1049–1057. https://doi.org/10.31817/tckhnnvn.2014.12.7.

Effect of The Ecological Regions and Gibberellic Acid (GA3) Application on Growth and Flower Development of Rhynchostylis gigantea (Lindley) Rindley

Dinh Thi Dinh (*) , Dang Van Dong , Tran Duy Quy

  • Tác giả liên hệ: [email protected]

    • Keywords

    Rhynchostylis gigantea (Lindley) Rindley, ecological regions, gibberellic acid (GA3) application, growth, flowering

    Abstract


    Rhynchostylis gigantea (Lindley) Ridley is a beautiful flower preferred by the market and has the potential to expand production in Vietnam. The major drawback of growing Rhynchostylis gigantea in Northern Vietnam is attributed to slow growth and development of the plants. Each year, the plants form only 1-2 leaves and take 3-4 years from planting to flowering. To overcome limitations in the Rhynchostylis gigantea production, the plant growth and development in different ecological regions, relationship between leaf and root growth and some flower characteristics were studied. The results showed that the plants grew fast in Southern conditions, followed by the Red River Delta and slowest in the Northern mountainous region. There existed a loose correlation between leaf length and root length (R2= 0.2081), but close correlation between leaf length and flower stalk length and number of flowers (R2= 0.8236 and R2 = 0.8121, respectively). Application of exogenous GA3 at 150ppm on 1-year old plants increased plant growth and shortened the time from planting to flowering from 3 years to 2 years with flowering proportion of 47%. Application of GA3 concentration of 200ppm on 2-year old plants increased leaf length, flower stalk length and the number of flowers per florescence with flowering proportion reached 80%.

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