The Effect of Photoperiod and Temperature on Flowering of Pycnosorus Thompsonianus

Authors

  • Tuan Minh Ha Thai Nguyen University of Agriculture and Forestry, Thai Nguyen city, Vietnam 23000
  • Santi Krisantini Bogor Agricultural University, Department of Agronomy and Horticulture, Bogor, Indonesia 16680.
  • Margaret E. Johnston The University of Queensland, School of Agriculture and Food Sciences, Gatton Campus, Gatton, Australia 4343.

Keywords:

Daylength, Vernalisation, Cooling, Anthesis, Australian species, Visible bud stage

Abstract

The flowering responses of Pycnosorus thompsonianus to day-lengths and temperatures were investigated to study the floral regulation of this potential ornamental plant in southern Queensland, Australia. Plants of different treatments were cooled at 20/10°C or kept at 30/20°C for 21 or 42 days under short day (SD), long day (LD), or short day for six weeks before transferring to long day (SDLD) in environment-controlled greenhouse bays during 2009 - 2010. LDs promoted earlier flowering and plants under LDs flowered regardless of temperature regimes. Cool temperatures and cooling periods were required for efficient flowering of plants under SDs, but were not important for plants under LDs and SDLDs. Forty-two percent of the plants under warm (30/20°C) SD remained vegetative after a 16-week growing period. Cooling for 21 days was sufficient for plant growth and floral development of the species. Daylength was more effective than temperatures for promoting earlier flowering and for increasing flower production.

 

Author Biographies

Tuan Minh Ha, Thai Nguyen University of Agriculture and Forestry, Thai Nguyen city, Vietnam 23000

Faculty of Agronomy, Thai Nguyen University of Agriculture & Forestry, Thai Nguyen city, Vietnam.

Santi Krisantini, Bogor Agricultural University, Department of Agronomy and Horticulture, Bogor, Indonesia 16680.

Bogor Agricultural University, Department of Agronomy and Horticulture, Bogor, Indonesia 16680.

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Published

2013-12-13

How to Cite

Ha, T. M., Krisantini, S., & Johnston, M. E. (2013). The Effect of Photoperiod and Temperature on Flowering of Pycnosorus Thompsonianus. Asian Journal of Agriculture and Food Sciences, 1(5). Retrieved from https://ajouronline.com/index.php/AJAFS/article/view/612