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Influence of bud opening solutions on the biochemical changes occurring in cut roses of varying maturity.

De, L. C.; Chatterjee, S. R.; Nair, T. V. R.; Bhattacharjee, S. K.;

Plant Physiology & Biochemistry (New Delhi) Year: 1996 Vol: 23 Issue: 2 Pages: 173-178 Ref: 13 ref.

1996

บทคัดย่อ

Influence of bud opening solutions on the biochemical changes occurring in cut roses of varying maturity.

In order to facilitate opening of immature flower buds in the excised stems of Rosa hybrida cv. Super Star, an experiment was carried out with cut flowers harvested at 4 different stages of bud maturity and treated with various bud opening solutions. Cut flowers kept in a holding solution of silver thiosulphate (STS) (0.2 mM) + 8-hydroxy quinidine citrate (8-HQC) (300 ppm) + sucrose (2%) showed maximum beneficial effects on postharvest life and quality of flowers. The effect of this treatment was very pronounced when the flowers were harvested when they comprised a loose tipped bud with furled petal, while in untreated controls such flower buds did not open at all. The changes in the content of total soluble sugar (TSS) and total free amino acids (TFAA) were estimated in dried samples of leaves, stem and petals of cut rose at harvest, on the third day in vases and at senescence after treatment with different holding solutions. In general, petals contained the greatest amount of TSS followed by l

eaves and stem in the freshly harvested untreated cut roses at all stages of bud maturity. Similarly petals contained the greatest amount of TFAA followed by stem and leaves. There was a progressive rise in contents of TSS and TFAA from less mature to more mature flower buds. Among the various bud opening treatments, the greatest amount of TSS and least amount of TFAA was found in dried petals, leaves and stems of cut roses treated with STS (0.2 mM) + 8 HQC (300 ppm) + sucrose (2%), especially for cut flowers harvested when they comprised loose tipped buds with no unfurled petals; these also showed maximum flower longevity. The untreated samples, however, showed the greatest content of TFAA and the lowest content of TSS in all stages of bud maturity.