Abstract
ABSTRACT Improving the quality and rate of opening of cut flowers is important to meet consumer demand. Thus, it is important to develop methods to control the rate of flower opening and senescence in ornamental plants. In this study, we investigated the effects of 1-naphthaleneacetic acid (NAA) in flower opening in rose (Rosa sp.) cultivars Princess Meg, Red Star and Madrid. Cut roses were maintained under different concentrations of NAA. Shoot bases were immersed in water solution containing 0, 100, and 1,000 μM NAA, in addition to 2% w/v sucrose with 0.02% w/v 8-hydroxyquinoline monohydrate. Subsequently, their vase life, flower opening, flower diameter and petal weight were measured. Flower opening in all three cultivars was clearly promoted by the 1,000 μM NAA treatment, resulting in higher petal fresh weight and flower diameter at 2 days following treatment. 100 μM NAA treatment also promoted flower opening and petal wilting in three cultivars, although the decrease in relative fresh weight of cut rose became slower and vase-life became longer than 1,000 μM NAA treatment in “Madrid”. This indicates that NAA promotes flower opening and petal growth in three cut rose cultivars. However, NAA treatment also promoted petal wilting, resulting in shorter vase-life. Although rose cultivars differed in their sensitivity to the NAA treatment, we conclude that NAA shows high potential as a chemical agent for controlling flower opening in cut rose cultivars.
Highlights
Rose (Rosa sp.) is one of the most important ornamental plants grown as cut flowers and garden plants
naphthaleneacetic acid (NAA) treatment promoted flower opening in all rose cultivars (Figure 1)
All cut flowers treated with NAA withered within six days, and vase life was shorter than control (Table 1)
Summary
Rose (Rosa sp.) is one of the most important ornamental plants grown as cut flowers and garden plants. The use of auxins to improve vase life of cut flowers is reported in some studies. 1-naphthaleneacetic acid (NAA) treatment has been shown to be effective in improving the postharvest life of cut Eustoma flowers (Shimizu-Yumoto and Ichimura, 2010). In another study, Khandaker et al (2017) showed that spraying the plant with 25 mg/L NAA enhanced the growth and development of the Mokara Chark Kuan orchid cut flower. Limited information is available on the effects of NAA on flower opening and petal growth in cut roses, as well as on the differences in the response to NAA treatment among cultivars. In this study, we investigated the effects of different concentrations of NAA in flower opening and petal growth in three cut rose cultivars. The data was subjected to analysis of variance, and differences across means were determined using Tukey’s test, with significance defined as p
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