The Effects And Regulation Of Environmental Factors On Growth And Development Of Ornamental Flower

Flowers play an important role in our society and become a necessary product in modern life. The development of ornamental flower depends on its genetic versions as well as environmental factors. In order to clarify the effects and regulation of environmental factors on ornamental plants, seeking scientific and efficient regulative means, the comprehensive techniques controlling ornamental plants development were studied in artificial environment, which include the effects of illumination, pH and nutrient content in culture matrix, inoculating bacterial cell suspension and applying Gibberellic acid(GA) on the development of ornamental plants Tagetes erecta,celosia cristata,dahlia pinnata and obtained the following conclusion. 1. Inllustration control showed different influences on flower plants development and physiology Plant weight, plant height stem diameter, and flower product were obviously decreased, the soluble sugar content in flowers was significantly increased and also bloom initiation was advanced with shade treatment of Tagetes erecta.But a slight effect on plant weight and flower counts of illustration compensating treatment was observed. It was found that compensating with illumination the plant was shortened and enlarged, the soluble sugar content in flowers was also decreased and the bloom initiation was prolonged. Compensating with appropriate illumination, plant weight of celosia cristata was decreased with shortened height and enlarged stem and also chlorophyll content in leaves was increased. Growing in shade was helpful for plant height, but not for stem enlarging growth and chlorophyll content accumulation in leaves. The soluble sugar content in plant and flowers were affected slightly by shade treatment or illumination compensation. Bloom initiation was prolonged in compensating with illumination but advanced in shade 2. Opitimal pH value and buffering capacity were principal parameters in artificial culture matrix The optimal pH for dahlia pinnata growth was neutral to slightly alkaline condition, but neutral to slight acidic condition for Tagetes erecta and celosia cristata, and much acidic for celosia cristata。The pH in culture matrix had regulative effects on blooming phase. And greater regulations were observed for dahlia pinnata and celosia cristata,poor effects for Tagetes erecta. It was found that ornamental plants could raise the pH value in culture matrix and the lower the initial acidity, the higher pH value rise. 3. Nutrient supply design and release rate were important and efficient regulative measurement Release control fertilizers was necessary nitrogen supplies for ornamental plant growth. Urea formaldehyde was the optimal selection for Tagetes erecta, and coating urea was more suitable for celosia cristata Tagetes erecta grew in a broad scale of phosphorus and potassium nutrient. both phosphorus and potassium showed a saturate effect for celosia cristata growth, suggesting a emphasis on suitable quantitive application. Supplying different nutrient types showed distinct effects on bloom phase. The bloom initiation were advanced by improving phosphorous supply and prolonged by potassium supply. The effects of nitrogen fertilizer were not uniformly on ornamental plant bloom phase. 4. Application with bacterial agent was an naval and practical means in the development regulation of ornamental plants. Tested bacterial agents showed a higher infection abilities to Tagetes erecta but poor to celosia cristata. Selecting Glomus versiforme as inoculum observed satisfied effects on Tagetes erecta with improvement of nutrient uptake and transfer to flowers. Infection by Glomus mosseae and mixture of G. versiforme and G. mosseae showed a side effect on Tagetes erecta.when infected by G. versiforme, the nutrition status of celosia cristata changed slightly, and no marked transfers of nutrients to flowers were observed. Bloom initiations of ornamental plants were prolonged by inoculating bacterial agents, and a pronounced effect was observed on celosia cristata 5. Applying concentration and time of chemical hormone were important parameters in the chemical control of ornamental plant. Spraying GA could stimulate the developments of dahlia pinnata.and celosia cristata And spraying in latter development phase gained better effects. Applying GA chlorophyll content in leaves of dahlia pinnata decreased and bloom initiation advanced. And much advanced for several days was observed in application with GA in latter development phase it was also found that the bloom initiation advanced by applying GA to Tagetes erecta. The influences of GA application in chlorophyll content in leaves and bloom phase of celosia cristata was different, which depended on the GA concentration and applying time.