Abstract
Abstract Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers in nutrient solution containing 0 or 500 μM putrescine (Put) and were exposed to 0.2 or 15 kJ‐m‐2 day1 of biologically effective UV‐B radiation to determine the comparative sensitivity of shoots and roots to increased UV‐B and the possible protective effect of polyamines. Shoot growth in UV‐B‐treated plants was reduced 48%, root growth 63%, total leaf area 38%, and specific leaf weight (SLW) 22%. This was in contrast to previous reports of increased SLW in cucumber plants grown in vermiculite or in a peat‐vermiculite mix. Putrescine treatment increased leaf area in the second and third leaf and total leaf area and Put also increased dry weight of shoots, but had no effect on dry weight of roots or on SLW. The Put treatment was ineffective in ameliorating UV‐B induced leaf chlorosis. This is the first report of greater sensitivity of roots to UV‐B radiation than of shoots in plants grown in solution culture. This could have significant consequences on marginal lands where root growth is already under limiting conditions.
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Claims 9
Claim · model-written summary
UV-B reduced cucumber shoot growth by 48%.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)
Cucumis sativuse1 - Treatment
- UV‐B‐treatede0
- Outcome
- Shoot growthe0
- Direction
- reducede0
- Value
- 48%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth in UV‐B‐treated plants was reduced 48%”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers in nutrient solution containing 0 or 500 μM putrescine (Put) and were exposed to 0.2 or 15 kJ‐m‐2 day1 of biologically effective UV‐B radiation”
Claim · model-written summary
UV-B reduced cucumber root growth by 63%.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse2
- Treatment
- UV‐B‐treatede1
- Outcome
- root growthe0
- Direction
- reducede1
- Value
- 63%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth 63%”
e1“Shoot growth in UV‐B‐treated plants was reduced 48%, root growth 63%”
e2“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
Claim · model-written summary
UV-B reduced total leaf area by 38%.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- UV‐B‐treatede0
- Outcome
- total leaf areae0
- Direction
- reducede0
- Value
- 38%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth in UV‐B‐treated plants was reduced 48%, root growth 63%, total leaf area 38%”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
Claim · model-written summary
UV-B reduced specific leaf weight by 22%.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- UV‐B‐treatede0
- Outcome
- specific leaf weight (SLW)e0
- Direction
- reducede0
- Value
- 22%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth in UV‐B‐treated plants was reduced 48%, root growth 63%, total leaf area 38%, and specific leaf weight (SLW) 22%”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
Claim · model-written summary
Putrescine increased second- and third-leaf area and total leaf area.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- Putrescine treatmente0
- Outcome
- leaf area in the second and third leaf and total leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Putrescine treatment increased leaf area in the second and third leaf and total leaf area”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
Claim · model-written summary
Putrescine increased shoot dry weight.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- Pute0
- Outcome
- dry weight of shootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Put also increased dry weight of shoots”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
Claim · model-written summary
Putrescine had no effect on root dry weight or specific leaf weight.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- Pute0
- Outcome
- dry weight of roots or on SLWe0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Put also increased dry weight of shoots, but had no effect on dry weight of roots or on SLW”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
Claim · model-written summary
Putrescine did not ameliorate UV-B-induced leaf chlorosis.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse1
- Treatment
- Put treatmente0
- Outcome
- UV‐B induced leaf chlorosise0
- Direction
- ineffectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Put treatment was ineffective in ameliorating UV‐B induced leaf chlorosis.”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
Claim · model-written summary
Roots were more sensitive to UV-B than shoots in solution culture.
- Taxon
- Poinsett cucumber (Cucumis sativus L.)Cucumis sativuse1
- Outcome
- sensitivity of roots to UV‐B radiatione0
- Direction
- greatere0
- Comparator
- shootse0
- Setting
- solution culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater sensitivity of roots to UV‐B radiation than of shoots in plants grown in solution culture”
e1“Poinsett cucumber (Cucumis sativus L.) seedlings were grown in growth chambers”
The same questions in other papers
putrescine · physiology: pigments · Cucumis sativus (cucumber)Positive and negative results
1 in the opposite direction
- positive
putrescine · growth · Cucumis sativus (cucumber)Results agree
7 papers in the same direction as this paper
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →uv · growth · Cucumis sativus (cucumber)Results differ
28 papers in the same direction as this paper · 10 in the opposite direction
- positive
- negative
- negative
35 papers more in this group
See all 39 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.