Abstract
The relationships between ethylene production, aminocyclopropane-1-carboxylic acid (ACC) content and ethylene-forming-enzyme (EFE) activity during ageing and cold storage of rose flower petals (Rose hybrida L. cv. Gabriella) were investigated. During flower ageing at 20 °C there was a climacteric rise in petal ethylene production, a parallel increase in ACC content, but a continuous decrease in EFE activity. Applied ACC increased petal ethylene production c. 200-fold. During cold storage of flowers at 1 °C there were parallel increases in petal ethylene production and ACC content, to levels greater than those reached in fresh flowers held at 20 °C. EFE activity decreased during storage. Immediately after cold-stored flowers were transferred to 20 °C ethylene production and ACC levels were c. four times greater than in freshly cut flowers. These levels increased to maximum values of two to four times the maximum values reached during ageing of fresh, unstored, flowers. It was concluded that in rose petals ethylene synthesis is probably regulated by ACC levels and that cold storage stimulates ethylene synthesis because it increases the levels of ACC in the petals.
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Claims 10
Claim · model-written summary
Petal ethylene production showed a climacteric rise during flower ageing at 20 °C.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e1“During flower ageing at 20 °C there was a climacteric rise in petal ethylene production, a parallel increase in ACC content, but a continuous decrease in EFE activity”
Claim · model-written summary
ACC content increased in parallel with petal ethylene production during flower ageing.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e1“During flower ageing at 20 °C there was a climacteric rise in petal ethylene production, a parallel increase in ACC content, but a continuous decrease in EFE activity”
Claim · model-written summary
Ethylene-forming-enzyme activity showed a continuous decrease during flower ageing.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e1“During flower ageing at 20 °C there was a climacteric rise in petal ethylene production, a parallel increase in ACC content, but a continuous decrease in EFE activity”
Claim · model-written summary
Applied ACC increased petal ethylene production about 200-fold.
- Taxon
- Rose hybridae0
- Treatment
- Applied ACCe2
- Outcome
- petal ethylene productione2
- Direction
- increasede2
- Value
- c. 200-folde2
Not reportedComparator
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e2“Applied ACC increased petal ethylene production c. 200-fold”
Claim · model-written summary
Cold storage at 1 °C increased petal ethylene production and ACC content to levels greater than in fresh flowers held at 20 °C.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e3“During cold storage of flowers at 1 °C there were parallel increases in petal ethylene production and ACC content, to levels greater than those reached in fresh flowers held at 20 °C”
Claim · model-written summary
EFE activity decreased during storage of cold-stored rose flowers.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e4“EFE activity decreased during storage”
Claim · model-written summary
After transfer to 20 °C, ethylene production and ACC levels were about four times greater than in freshly cut flowers.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e5“Immediately after cold-stored flowers were transferred to 20 °C ethylene production and ACC levels were c. four times greater than in freshly cut flowers”
Claim · model-written summary
After transfer to 20 °C, ethylene and ACC levels increased to maximum values two to four times those of fresh unstored flowers during ageing.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e5“Immediately after cold-stored flowers were transferred to 20 °C ethylene production and ACC levels were c. four times greater than in freshly cut flowers”
e6“These levels increased to maximum values of two to four times the maximum values reached during ageing of fresh, unstored, flowers”
Claim · model-written summary
Ethylene synthesis in rose petals is probably regulated by ACC levels.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e7“in rose petals ethylene synthesis is probably regulated by ACC levels”
Claim · model-written summary
Cold storage stimulates ethylene synthesis because it increases ACC levels in petals.
Verbatim
e0“rose flower petals (Rose hybrida L. cv. Gabriella)”
e7“cold storage stimulates ethylene synthesis because it increases the levels of ACC in the petals”