TRIA application increased plant dry weight, protein and chlorophyll contents, and the net photosynthetic rate in rice [9]. It has also been reported HTC that TRIA is involved in the upregulation of many genes that are involved in photosynthesis. Skogen et al. [10] reported that TRIA application increases plant growth, the number of inflorescences, and the quality of chrysanthemum (Chrysanthemum morifolium) flowers. Many researchers have examined the effects of TRIA on vegetables and certain agronomic crops, and these studies reported stimulatory effects on crop growth, yield, and quality. It is believed that the growth regulator TRIA could also have stimulatory effects on flowering plants. However, very few studies have examined how to improve the quality and longevity of Bougainvillea plants under natural or green house conditions.

Currently, no information is available in the literature on the effects of TRIA on plant growth, flowering, and quality in potted Bougainvillea plants. This study evaluated the impacts of TRIA on improving the quality of Bougainvillea plants under natural conditions. It is proposed that TRIA application can improve the plant’s physiological activities, stimulate flowering, and increase the quality of potted Bougainvillea plants. The findings of this study will provide a basis for future research into the growth-regulating effects of TRIA on Bougainvillea and other ornamental and flowering plants.2. Materials and Methods2.1. Experimental Site and Plant MaterialThe experiments were carried out at the Plant Physiology Garden at the Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, between 2010 and 2011.

The experiments during the first season (June 2010�COctober 2010) and the second season (February 2011�CJune 2011) were performed in the same location. One-year-old seedlings of potted Bougainvillea plants were collected from a Batimastat commercial nursery in Sungai Buloh, Selangor when the plants were 0.6m long with approximately 6 to 8 secondary branches. These seedlings were planted in 7-inch pots filled with garden soil and peat soil in a ratio of 5:5. The plants were thoroughly watered when the soil appeared dry, approximately every 3 to 5 days, during the experimental period. All of the experiments, regardless of the season or year, were performed under the following normal prevailing conditions for this region: temperature 21�C32��C, maximum PAR 2000��Em?2s?1, and relative humidity of 60%�C90%. Five grams of nutrients (N:P:K, at a ratio of 12:12:17) per plant were applied at 15-day intervals. Twenty Bougainvillea plants were used for each season. A completely randomized design (CRD) with four replications was used for each season’s experiment.2.2.