บทคัดย่องานวิจัย

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Ethylene-insensitive floral senescence in Sandersonia aurantiaca (Hook.).

Eason, J. R.; Vre, L. de;

New Zealand Journal of Crop and Horticultural Science Year: 1995 Vol: 23 Issue: 4 Pages: 447-454 Ref: 26 ref.

1995

บทคัดย่อ

Ethylene-insensitive floral senescence in Sandersonia aurantiaca (Hook.).

 

Treating detached (pedicels cut to 5 cm), physiologically mature S. aurantiaca flowers with propylene (0.5% for 24 h) did not alter the patterns of colour change, FW or respiration which normally occur as the flowers senesce. Silver thiosulfate (STS, 1 mM) did not extend the vase life of the flowers. Postharvest ethylene production by flowers was negligible, regardless of whether they had been exposed to propylene and or STS. Cycloheximide treatments (1 or 100 micro M) inhibited the pigment loss or fading associated with flower senescence, suggesting that de novo protein synthesis is required for pigment degradation in senescing flowers of this crop. However, 100 micro M cycloheximide also caused detached flowers to wilt prematurely, thereby changing the normal sequence of events during senescence. Exposing flowers to actinomycin D [dactinomycin] caused a subtle change in their pattern of senescence and in vitro translation of RNA extracted from the flowers produced a pattern of translation prod

ucts that differed from that of control flowers held in water. The data demonstrate that specific changes in both transcription and translation accompany the ethylene-insensitive senescence of sandersonia flowers.