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  ISSN: 0857-0841 (Print)
  ISSN: 2630-029X (Online)

"Article Journal of Agriculture"
Volume 34 Issue 3 September 2018 , ISSN 0857-0841
Title. : Annual Flower Bud Development of Vanda Manuvadee
Author : Takonwan Sirisawad and Soraya Ruamrungsri
Page : 341-351
index word : กล้วยไม้(Orchid) การพัฒนาของตาดอก(flower development) การออกดอก(flowering) เนื้อเยื่อวิทยาของตาดอก(flower bud histology) ปัจจัยสภาพแวดล้อมของการออกดอก(environmental factors for flowering)
Flowering behavior and histological studies on the development of Vanda Manuvadee flower buds were investigated every 2 weeks interval during 2013-2014, to illustrate the periods of flower bud initiation, differentiation and development, which related to environments. Flower buds initiated from mature axillary buds were found almost the year under favorite environment as photoperiod of 9-12 hours/day, temperature range of 18-33°C and relative humidity of 60-96%. Apical shoot meristem of axillary bud changed its growth phase from vegetative to reproductive characters. The leaf and floral primordia at each leaf axil formed while the apical meristem grew, and those developed to bracteoles and florets located on elongated rachis with raceme type inflorescence. Flower bud initiated about 4-6 weeks before emerged through leaf base with slow elongation prior rapid one. It used about 12 weeks average from initiation to first flower opened. A few flower buds developed on the same period, but one or two buds could reach to the flower open while the others wilted. The longevity of inflorescence was average 2.8 weeks. In the period of blooming, new flower buds could occur and develop to mature inflorescence. They reached blooming 3 times per year. The environmental factors during March to April affected young inflorescence wilted, and absent of the flower bud development.
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