The Effect of Plant Maturity and Cooling Duration on Flowering and Plant Habits of Pycnosorus thompsonianus under Short Days
Keywords:
Short days, Cooling, Anthesis, Growth habit, Australian native species.Abstract
As a potential Australian native flower species, Pycnosorus thompsonianus was selected to study the effects of chilling duration and ages at chilling on its plant growth habit and subsequent flowering in southern Queensland during September 2009 to March 2010. Seedlings of four age groups (1, 7, 14, 28 days old) were exposed to different cooling periods (0, 3, 7, 14 and 21 days) at 20/10°C under short days (11h). The species was found to have a facultative requirement for flowering in response to low temperature. Generally, the growth and flowering were enhanced in accordance with the increase of seedling ages and cooling duration under short-day condition. Further studies on the effects of chilling duration on flowering of P. thompsonianus are necessary to develop a production guideline for commercial production.
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