Abstract
UV‐B‐sensitive (Poinsett) and ‐insensitive (Ashley) cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers at 600 μmol m −2 s −1 of photosynthetically active radiation provided by metal halide (MH) or high pressure sodium/deluxe (HPS/DX) lamps. Plants were irradiated 15 days from seeding for 6 h per day under 18. 2 kJ m −2 day −1 of biologically effective UV‐B (UV‐B BE ) radiation. One of the most pronounced effects of UV‐B was a 27 to 78% increase in phenylalanine ammonialyase (PAL) activity. UV‐B also increased total polyamines. Catalase and superoxide dismutase varied greatly in their response to UV‐B. There were no interactive effects on PAL or catalase activity, or total polyamines. There was a UV × PAR source interaction for superoxide dismutase activity. UV‐B increased chlorosis and decreased height, dry weight and leaf area. Stem elongation, biomass production, leaf enlargement and chlorosis were greater under HPS/DX lamps than under MH lamps. Chlorosis was greater in Poinsett than in Ashley and in lower leaves than in upper ones. Aside from chlorosis, there were no interactive effects of UV‐B, PAR source or cultivar on any of the growth parameters measured, suggesting that the growth response of cucumber seedlings to UV‐B is unaffected by PAR source or cultivar. Similarly, except for SOD activity, the biochemical response to UV‐B was also not influenced by PAR source or cultivar.
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Claims 12
Claim · model-written summary
UV-B increased phenylalanine ammonialyase activity by 27 to 78%.
- Taxon
- Cucumis sativus
Cucumis sativuse0 - Treatment
- UV‐Be1
- Outcome
- phenylalanine ammonialyase (PAL) activitye1
- Direction
- increasee1
- Value
- 27 to 78%e1
- Setting
- growth chamberse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e1“One of the most pronounced effects of UV‐B was a 27 to 78% increase in phenylalanine ammonialyase (PAL) activity”
Claim · model-written summary
UV-B increased total polyamines.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- UV‐Be2
- Outcome
- total polyaminese2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e2“UV‐B also increased total polyamines”
Claim · model-written summary
Catalase and superoxide dismutase activities varied greatly in response to UV-B.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- UV‐Be3
- Outcome
- Catalase and superoxide dismutasee3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e3“Catalase and superoxide dismutase varied greatly in their response to UV‐B”
Claim · model-written summary
There were no interactive effects of UV-B and PAR source on PAL or catalase activity or total polyamines.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- UV‐Be1
- Outcome
- interactive effects on PAL or catalase activity, or total polyaminese2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e1“Plants were irradiated 15 days from seeding for 6 h per day under 18. 2 kJ m −2 day −1 of biologically effective UV‐B”
e2“There were no interactive effects on PAL or catalase activity, or total polyamines”
Claim · model-written summary
UV × PAR source interaction affected superoxide dismutase activity.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- UV × PAR sourcee5
- Outcome
- superoxide dismutase activitye5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e5“There was a UV × PAR source interaction for superoxide dismutase activity”
Claim · model-written summary
UV-B increased chlorosis of cucumber seedlings.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- UV‐Be6
- Outcome
- chlorosise6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e6“UV‐B increased chlorosis and decreased height, dry weight and leaf area”
Claim · model-written summary
UV-B decreased height, dry weight and leaf area of cucumber seedlings.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- UV‐Be6
- Outcome
- height, dry weight and leaf areae6
- Direction
- decreasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e6“UV‐B increased chlorosis and decreased height, dry weight and leaf area”
Claim · model-written summary
Stem elongation, biomass production and leaf enlargement were greater under HPS/DX lamps than under MH lamps.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- HPS/DX lampse7
- Outcome
- Stem elongation, biomass production, leaf enlargemente7
- Direction
- greatere7
- Comparator
- MH lampse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e7“Stem elongation, biomass production, leaf enlargement and chlorosis were greater under HPS/DX lamps than under MH lamps”
Claim · model-written summary
Chlorosis was greater under HPS/DX lamps than under MH lamps.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- HPS/DX lampse7
- Outcome
- chlorosise7
- Direction
- greatere7
- Comparator
- MH lampse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e7“Stem elongation, biomass production, leaf enlargement and chlorosis were greater under HPS/DX lamps than under MH lamps”
Claim · model-written summary
Chlorosis was greater in Poinsett than in Ashley.
- Taxon
- Cucumis sativusCucumis sativuse0
- Material
- Poinsette1
- Outcome
- Chlorosise1
- Direction
- greatere1
- Comparator
- Ashleye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e1“Chlorosis was greater in Poinsett than in Ashley and in lower leaves than in upper ones”
Claim · model-written summary
Chlorosis was greater in lower leaves than in upper leaves.
- Taxon
- Cucumis sativusCucumis sativuse0
- Organ / stage
- lower leavese1
- Outcome
- Chlorosise1
- Direction
- greatere1
- Comparator
- upper onese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e1“Chlorosis was greater in Poinsett than in Ashley and in lower leaves than in upper ones”
Claim · model-written summary
Apart from chlorosis, UV-B, PAR source and cultivar had no interactive effects on the growth parameters measured.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- UV‐Be1
- Outcome
- growth parameterse2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars of cucumber ( Cucumis sativus L.) were grown in growth chambers”
e1“Plants were irradiated 15 days from seeding for 6 h per day under 18. 2 kJ m −2 day −1 of biologically effective UV‐B”
e2“Aside from chlorosis, there were no interactive effects of UV‐B, PAR source or cultivar on any of the growth parameters measured”
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