Abstract
Experiments were performed on miniature potted roses ( Rosa ) to investigate whether increasing the Ca concentration in the nutrient solution would increase the Ca concentration in the rose plant, resulting in better postharvest quality. The plants were watered during the whole production period with six different nutrient solutions with Ca at 1.1 to 4.4 m m and varying meq ratios between Ca and the cations. During the postharvest period, plant characteristics were recorded at days 0, 11, 14, 18, and 25. Increasing Ca in the nutrient solution significantly increased the Ca concentration of the plants. However, the NH 4 level (2% to 5% vs. 22% to 25%) also influenced the Ca concentration of the plants. Leaves had the highest Ca concentration, which was more than twice the level in flowers and buds, stems and roots. There were no differences in dry matter content between treatments in roots or tops at marketing stage. At the start of the postharvest treatment (day 0), plants from the highest Ca treatment had significantly fewer flowers than those in all of the other treatments due to delayed development. The number of good flowers increased from days 0 to 14 irrespective of treatment, while a further increase to day 18 was observed in plants from the three highest Ca treatments (low NH 4 ) due to a negative effect on flower longevity of low Ca and high NH 4 in the three low-Ca treatments. By day 25, the number of good flowers had decreased markedly in all treatments, but plants from the second-highest Ca treatment had significantly more good flowers than plants from the other treatments. Flower wilting was due to infection by grey mold ( Botrytis cinerea ) and a physiological condition that caused wilting that began at the petal edges with a dark discoloration. Infection with grey mold was negatively correlated with Ca concentration in the flowers. The physiological wilting was seen earlier in plants from the treatments with high NH 4 and is probably not related to Ca concentration in the flowers.
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Claims 12
Claim · model-written summary
Increasing solution calcium increased plant calcium.
- Taxon
- rosest0
- Treatment
- Increasing Ca in the nutrient solutione0
- Outcome
- Ca concentration of the plantse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Increasing Ca in the nutrient solution significantly increased the Ca concentration of the plants.”
t0“roses”
Claim · model-written summary
Ammonium level influenced plant calcium.
- Taxon
- rosest0
- Treatment
- NH 4 levele0
- Outcome
- Ca concentration of the plantse0
- Comparator
- 2% to 5% vs. 22% to 25%e0
Not reportedDirection
Verbatim
e0“the NH 4 level (2% to 5% vs. 22% to 25%) also influenced the Ca concentration of the plants.”
t0“roses”
Claim · model-written summary
Leaves had over twice the calcium concentration of other organs.
Verbatim
e0“Leaves had the highest Ca concentration, which was more than twice the level in flowers and buds, stems and roots.”
t0“roses”
Claim · model-written summary
Dry matter content did not differ among treatments in roots or tops at marketing.
Verbatim
e0“There were no differences in dry matter content between treatments in roots or tops at marketing stage.”
t0“roses”
Claim · model-written summary
The highest calcium treatment had fewer flowers at day zero.
Verbatim
e0“plants from the highest Ca treatment had significantly fewer flowers than those in all of the other treatments due to delayed development.”
t0“roses”
Claim · model-written summary
Good flowers increased through day 14 regardless of treatment.
Verbatim
e0“The number of good flowers increased from days 0 to 14 irrespective of treatment”
t0“roses”
Claim · model-written summary
Good flowers increased further through day 18 with three highest calcium treatments.
Verbatim
e0“The number of good flowers increased from days 0 to 14 irrespective of treatment, while a further increase to day 18 was observed in plants from the three highest Ca treatments (low NH 4 )”
t0“roses”
Claim · model-written summary
Good flowers declined markedly by day 25 in all treatments.
Verbatim
e0“By day 25, the number of good flowers had decreased markedly in all treatments”
t0“roses”
Claim · model-written summary
The second highest calcium treatment retained more good flowers by day 25.
Verbatim
e0“plants from the second-highest Ca treatment had significantly more good flowers than plants from the other treatments.”
t0“roses”
Claim · model-written summary
Grey mold infection caused flower wilting.
- Taxon
- rosest0
- Interactor
- Botrytis cinerea
Botrytis cinereae0pathogen - Outcome
- Flower wiltinge0
- Qualifier
- infection by grey molde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flower wilting was due to infection by grey mold ( Botrytis cinerea )”
t0“roses”
Claim · model-written summary
Flower calcium concentration correlated negatively with grey mold infection.
Verbatim
e0“Infection with grey mold was negatively correlated with Ca concentration in the flowers.”
t0“roses”
Claim · model-written summary
Physiological wilting appeared earlier with high ammonium.
Verbatim
e0“The physiological wilting was seen earlier in plants from the treatments with high NH 4”
t0“roses”
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See all 7 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.