Effects Of ALA On Flowering Quality And Productivity Of Rosa Hybrida ’Carola’

ALA as a new plant growth regulator was used widely on improving productivity and quality of vegetables.However,there were few studies in the flower area.The experiment was carried out to examine the effects of leaf-spray with100mg/L5-aminolevulinic acid (ALA) on the growth of flowering branches of Rosa hybrida’Carola’ during different growth seasons, taking water spraying as control. By measuring the related morphological and physiological indicators of leaves of flowering branches.The study was about that to further discuss the effect and mechanism of ALA on flowering quality and productivity. It has important theoretical significance and practical value for the promotion of ALA in the flower industry, as well as to improve the productivity and quality of roses.The main results in this study are as follows:l.Low concentrations of ALA can increase plant biomass.Results show that,100mg/L ALA spraying on the leaves can significantly improve the branch length, weight, and diameter in summer and winter,they respectively increase of8.40%,7.89%and10.81%in summer.High temperature causes reduction in the number of rose petals,it on the contrary in the low temperature,spraying of ALA to make this effects more obviously.Compared with control, the count of ’corolla’ petal increased of9.22%in the winter,and decreased of6.41%in summer.2.In summer and winter, the temperature is higher or lower than the optimum growth temperature of rose, that causes lower quality of cut rose flower.Tests showed that ALA significantly improved ’Corolla’ grade of squid in summer, autumn and winter.The rate of Grade "A" flower were increased by13.34%,12.88%and9.36%in autumn,summer and winter. Comprehensive comparison it main to improve the rate of grade "A" of flower, while reducing the rate of grade "D" of flower, particularly in winter.3. ALA is also proved to improve the flower productivity of R. hybrida’Carola’ with the increase of19.25%in a year compared with water spraying. 4.Laef-spray with ALA can increase R. hybrida ’Carola’ leaves chlorophyll content, and promote the nitrate assimilation, as well as the accumulation of carbohydrates and amino acids in the leaves. ALA can improve the utilization of mineral elements in R. hybrida ’Carola’ leaves and accelerate the transport of soluble sugar, which provide the more sufficient metabolites for the development of flowering branches.