Useful Flower Gardening Information

POST-HARVEST TECHNOLOGY 

Salicylhydrosamic acid (SHAM) ranging from  to in and then kept in distilled water. Except at 1mM concentration, SHAM an inhibitor of cynidemesistent respiration. was unable to reduce respiration rates and improving keeping quality of roses, thereby indicating that cynidemesistent respiration, was non-existent in cut roses (Reno Ranjan, 1993). In untreated roses she also observed a typical deep in the respiration rate initially from harvest till the third day and then a small rise towards the end of useful vase life of cut "Priyadarshini" roses. 55.w/iv (1998) reported that highest respiration rate in out roses was associated with shortest vase life, and lowest respiration with longest vase life. In cut rows respiration rates increased sharply during flower development and petal expansion stage, In the cultivars, which held longer vase life, the rates of respiration at different stage of flower development and ageing were comparatively lower than that of cultivars, which lasted for a shorter time (Bhattachar)ee and Pal, 1999). The gradual decline in respiration and presumably decreases in respiration efficiency of rose petals are due to progressive inability of mitochondria to utilize the substrate (Kaltaler and Steponkuo. 1976).

The gradual decline in respiration in ageing flowers may be caused by a short supply of readily respirable substrates, mainly sugars. In cut "Better Times" roses, lower storage temperatures were observed to reduce the rate of respiration (Pope, 1960). Serrano et. al., (1992) reported that respiration of rose flower cv. "Visa" decreased during storage at 4°C. The rate of respiration became slower as storage time increased. Vidhya Sacker (2001) recorded that lower retool respiration at different storages of "Raktagandha" cut roses was associated with longer vase life, resulted with 2 per cent DM50 pulsing + 4Days storage + preservative. Generally there was an increase in the rate of respiration after pulsing. the reduction after storage and further reduction at senescence.

CARI3OHYDRATE AND NITROGEN META/30LISM

The carbohydrate status is one of the most eswntial factor that effect the development (Mar and Halevy, 1979, Halvey and Mayak, 1979; Halsey, 1987) and wnescence (Ha/evy and Mayak, 1981; Zeislin, 1989) and in turn vase life clout flowers. The final stage of flower development are characterized by a decline ill the content of carbohydrates and dry weight of petals (Antis, 1957; Courts, 1973; Mayak and Halevy, 1974; Nichols, 1973). Sivasamy (1998) reported that higher starch content during different stages after harvest was associated with longer vase life of out roses. In general. the starch content declined gradually from harvest to senescence stage. Marissen (1991) recorded a competition between the inner and outer petals for sugar during flower development, as the area and sugar content increased when fewer outer petals were present dbring vase life. A progressive rise in total soluble sugars content in the petal tissues of roses front harvest towards senescence was observed (Sivasamy, 1998).

Breakdown of protein causes an accumulation of ammonia in the cells, which is responsible for bluing of petals of red roses. An exogenous supply of of sugar delays the onset of excessive protein degradation and also serve as substrate of protein synthesis (Parups and Chan, 1973; Paulin, 1977). However, there is need for further study on the respiratory metabolism and protein recycling in cut flowers.

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