Seasonal changes in nonstructural carbohydrates in jasmine (Jasminums sambac Ait) flowers and roles of photoperiods and temperatures on its quality
2009
Jutamanee, K. | Krisanapook, K.
The problem of commercial jasmine flowers production is there are low yield and small size in cool season. This experiment studied the relationship between total non structural carbohydrate (TNC) content in flowers and flowers quality such as weight, size and number of flowers. Since daylength and temperature were reduced under cool season, the role of photoperiod and temperature on flowers size and TNC content were also examined. After treatments, flower numbers were recorded and flower's weight, diameter, length and petal length were measured after sepal had been discarded. Then TNC of flowers were analyzed. The results showed that TNC content decreased during cool season from October to January. Flowers size and weight were decreased with decreasing flower's TNC. Jasmine plants that exposed to artificial lights extend to 12, 13, 14, 15 and 16 hour photoperiods during cool season of Dec for 15 days had more flower numbers than under natural condition with approximate 11 hour photoperiod. However, 12-16 hour photoperiods had no effects on increasing flower's weight, size and TNC. Jasmine plants that cultivated under 25 deg C and 35 deg C in growth chambers at the same time with photoperiods treatment gave better results in flower quality and TNC content than average 19.2 deg C natural condition. The higher temperature, the better flower quality and higher TNC were found. The results indicated that during cool season with limiting in daylength and low temperature, temperature had more effects on improvement jasmine flower quality than photoperiod. Low temperature also caused low carbohydrate content in flower which impacted poor jasmine flower quality.
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