Abstract
Abstract A gravity system was developed for measuring xylem conductivity in excised stem sections from ‘Red American Beauty’ roses. The system was reliable for measurement of the potential xylem conductivity which closely corresponded to actual water uptake in cut roses. Distilled water, sucrose, 8-hydroxy quinoline sulfate (8-HQS), and a modified Cornell solution (2% sucrose + 200 mg/liter 8-HQS) were tested for their effects on xylem conductivity and vascular blockage in excised stem sections. The modified Cornell solution showed the most favorable effects on conductivity, vase life, and appearance. The browning of stem tissue with 8-HQS was associated with a depressed rate of metabolism as measured by a modified triphenyl tetrazolium chloride test. Good xylem conductivity and a low incidence of vascular blockage was associated with the 8-HQS-depressed metabolic rate indicating an active process, attributed to a wound response triggered by excision of the cut flower, in the stem is responsible for vascular blockage. However, microscopic observations of fresh, frozen, and permanent tissue sections of rose xylem showed no evidence of lignin, tannins, or tyloses which are reputed to accompany wound response in plants.
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Claims 6
Claim · model-written summary
The gravity system reliably measured potential xylem conductivity corresponding closely to actual cut rose water uptake.
Verbatim
e0“The system was reliable for measurement of the potential xylem conductivity which closely corresponded to actual water uptake in cut roses”
t0“Cut Roses”
Claim · model-written summary
Modified Cornell solution gave the most favorable conductivity, vase life and appearance.
- Taxon
- Cut Rosest0
- Treatment
- modified Cornell solution (2% sucrose + 200 mg/liter 8-HQS)e1
- Outcome
- conductivity, vase life, and appearancee0
- Direction
- most favorablee0
Not reportedComparator
Verbatim
e0“The modified Cornell solution showed the most favorable effects on conductivity, vase life, and appearance”
e1“modified Cornell solution (2% sucrose + 200 mg/liter 8-HQS)”
t0“Cut Roses”
Claim · model-written summary
Stem browning with 8-HQS was associated with depressed metabolism.
Verbatim
e0“The browning of stem tissue with 8-HQS was associated with a depressed rate of metabolism”
t0“Cut Roses”
Claim · model-written summary
Good xylem conductivity and low vascular blockage were associated with 8-HQS-depressed metabolic rate.
- Taxon
- Cut Rosest0
- Treatment
- 8-HQSe0
- Outcome
- xylem conductivity and a low incidence of vascular blockagee0
Not reportedDirection
Verbatim
e0“Good xylem conductivity and a low incidence of vascular blockage was associated with the 8-HQS-depressed metabolic rate”
t0“Cut Roses”
Claim · model-written summary
The authors attributed vascular blockage to an active stem wound response after flower excision.
Verbatim
e0“an active process, attributed to a wound response triggered by excision of the cut flower, in the stem is responsible for vascular blockage”
t0“Cut Roses”
Claim · model-written summary
Rose xylem sections showed no lignin, tannins or tyloses.
Verbatim
e0“rose xylem showed no evidence of lignin, tannins, or tyloses”
The same questions in other papers
sucrose · quality: postharvest · RosaPositive and negative results
34 papers in the same direction as this paper · 1 in the opposite direction
- negative
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See all 36 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.