Malaysian Applied Biology Journal

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47_02_05

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Malays. Appl. Biol. (2018) 47(2): 33–37

 

GROWTH, FLOWERING AND GAS EXCHANGE OF Ruellia

brittoniana TREATED WITH DIFFERENT CONCENTRATIONS

AND APPLICATION FREQUENCIES OF DAMINOZIDE

 

NURHAZWANI MUSTAFFER1,2*, YAHYA AWANG2 and SHAIRUL IZAN RAMLEE2

1Gene Bank & Seed Centre, Persiaran MARDI-UPM, MARDI Headquarters,

43400, Serdang, Selangor

2Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia,

43400 UPM Serdang Selangor

*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

 

Accepted 20 April 2018, Published online 25 May 2018


ABSTRACT

Ruellia brittoniana is a fast growth plant with a strong tendency of vegetative growth that occurs at the expense of flowering capability, thus regular pruning for height control is necessary. Chemical pruning using suitable growth retardant may offer similar effects on stem and branch elongation, and flowering of the plants could be promoted. This study was carried out to evaluate the varying rate of daminozide and frequencies of application on the growth and flowering of Ruellia brittoniana. Results of a two factorial experiment involving two application frequencies (double and triple application) and five concentrations of daminozide (0, 500, 1000, 1500, 2000 mg L-1) showed that different concentration of daminozide and application frequencies significantly affected the vegetative growth, photosynthesis, transpiration and chlorophyll content. Daminozide at 500 mg L-1 with triple application caused a reduction of 42% in plant height compared to control with less detrimental effects on flower number. Daminozide application had not affected on the stomatal conductance. Application of daminozide at 500 mg L-1 given in triple application was found to be effective in producing short, compact plants with more flowers.

Key words: Ruellia brittoniana, daminozide, growth retardant

 

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