Studies on postharvest light intensity and temperature on carbohydrate levels and vase life of cut flowers
Pandya Himanshu and O.P. Saxena
Botany Dept., Gujarat Univ., Navarangpura, Ahmedabad-380009, Gujarat, India, 380009
2002
บทคัดย่อ
Studies about affecting vase life of cut flowers by postharvest cultivation conditons are still very limited. In this study the changes in different photosynthetic attributes of cut flowers is presented under different light intensity levels and temperature. Cholorophyll is the main light-trapping moleculein green plants. Higher amount of this pigment during vegetative phase reflects the significant conversion of solar energy in to chemical energy, which eventually leads to source accumulation. Variations observed for these photosynthetic pigments were presented in graphs and tables. The higher level of the chlorophyll pigment itself does not mean higher economic yields. The critical determinant for growth appears to be temperature. Low temperature affects the growth from seedling to reporductive stage. Influence of high temperature on growth from seedling to rreproductive stage. Influence of high and yield of flowrs in relation to there different planting dates was studied. The heat use efficiency was low in the early crop. The low yield obtained the early crop was mainly due to a smaller and short-lived canopy leading to reduced interception of solar radiation more than the reduction in overall plant growth. High temperature lowered the yield, through reduced partitioning of photosynthates to the cut flowers. Accumulated day degree was calculated taking 4 0C as the base temperature. Plants from different contrasting habitats show considerable changes in physiological and biochemical parameters. It appears from the results that low temperature decreased the accumulatioon of starch and soluble sugars by inhibiting the activity of the carbohydrate metabolism. Total soluble sugars content also affected due to low temperatue. The study also aims to compare the relative amount of proline accumulation. Total chlorophyll content in the leaf increased and the starch content decreased with reduction in light. The results from an extensive investigation were analyzed statistically.