Abstract
Paclobutrazol increased the tolerance of soybean (Glycine max L. cv. AC Bravor) seedlings to elevated levels of ultraviolet-B radiation (UV-B: 280 – 320 nm). Within 3 days of exposure to elevated UV-B, nontreated seedlings were photosynthetically less efficient, and by the end of the 11th day of treatment their leaf areas and fresh masses were, respectively, 55 and 44% smaller than their counterparts not irradiated with UV-B. In contrast, paclobutrazol-treated seedlings maintained full photosynthetic efficiency throughout the duration of UV-B irradiation, and their leaf areas and fresh masses were only reduced by 30 and 22%, respectively. No changes in flavonoid composition occurred as a result of the paclobutrazol or UV-B radiation treatments, but UV-B tended to increase the quantities of photosynthetic pigments. The leaves from paclobutrazol-treated seedlings were significantly thicker than those of nontreated seedlings, and SEM analyses showed that the treated seedlings had much denser epicuticular wax layers than the controls. No significant changes in protein expression occurred during exposure to elevated UV-B and (or) paclobutrazol. Further studies with paclobutrazol-treated plants may lead to a better understanding of one or more of the mechanisms employed by plants to tolerate elevated levels of UV-B. Key words: leaf fluorescence, paclobutrazol, pigments, protein synthesis, SEM, UV-B radiation.
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Claims 12
Claim · model-written summary
Paclobutrazol increased soybean seedling tolerance to elevated UV-B.
- Taxon
- soybean
Glycine maxe0 - Material
- AC Bravore0
- Treatment
- Paclobutrazole0
- Outcome
- tolerancee0
- Direction
- increasede0
- Qualifier
- elevated levels of ultraviolet-B radiatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paclobutrazol increased the tolerance of soybean (Glycine max L. cv. AC Bravor) seedlings to elevated levels of ultraviolet-B radiation (UV-B: 280 – 320 nm)”
Claim · model-written summary
Untreated seedlings had lower photosynthetic efficiency within three days of elevated UV-B.
- Taxon
- soybeanGlycine maxe1
- Treatment
- elevated UV-Be0
- Outcome
- photosyntheticallye0
- Direction
- less efficiente0
- Qualifier
- Within 3 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within 3 days of exposure to elevated UV-B, nontreated seedlings were photosynthetically less efficient”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Elevated UV-B reduced leaf area of untreated seedlings by 55% at day 11.
- Taxon
- soybeanGlycine maxe1
- Treatment
- UV-Be0
- Outcome
- leaf arease0
- Direction
- smallere0
- Value
- 55e0
- Comparator
- counterparts not irradiated with UV-Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by the end of the 11th day of treatment their leaf areas and fresh masses were, respectively, 55 and 44% smaller than their counterparts not irradiated with UV-B”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Elevated UV-B reduced fresh mass of untreated seedlings by 44% at day 11.
- Taxon
- soybeanGlycine maxe1
- Treatment
- UV-Be0
- Outcome
- fresh massese0
- Direction
- smallere0
- Value
- 44%e0
- Comparator
- counterparts not irradiated with UV-Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by the end of the 11th day of treatment their leaf areas and fresh masses were, respectively, 55 and 44% smaller than their counterparts not irradiated with UV-B”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Paclobutrazol-treated seedlings retained full photosynthetic efficiency under UV-B.
- Taxon
- soybeanGlycine maxe1
- Treatment
- paclobutrazol-treatede0
- Outcome
- photosynthetic efficiencye0
- Direction
- maintained fulle0
- Qualifier
- throughout the duration of UV-B irradiatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“paclobutrazol-treated seedlings maintained full photosynthetic efficiency throughout the duration of UV-B irradiation”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Under UV-B, leaf area of treated seedlings fell by 30%.
- Taxon
- soybeanGlycine maxe2
- Treatment
- paclobutrazol-treatede1
- Outcome
- leaf arease0
- Direction
- reducede0
- Value
- 30e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their leaf areas and fresh masses were only reduced by 30 and 22%, respectively”
e1“In contrast, paclobutrazol-treated seedlings”
e2“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Under UV-B, fresh mass of treated seedlings fell by 22%.
- Taxon
- soybeanGlycine maxe2
- Treatment
- paclobutrazol-treatede1
- Outcome
- fresh massese0
- Direction
- reducede0
- Value
- 22%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their leaf areas and fresh masses were only reduced by 30 and 22%, respectively”
e1“In contrast, paclobutrazol-treated seedlings”
e2“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Neither paclobutrazol nor UV-B changed flavonoid composition.
- Taxon
- soybeanGlycine maxe1
- Treatment
- paclobutrazol or UV-B radiation treatmentse0
- Outcome
- flavonoid compositione0
- Direction
- No changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No changes in flavonoid composition occurred as a result of the paclobutrazol or UV-B radiation treatments”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
UV-B tended to increase photosynthetic pigment quantities.
- Taxon
- soybeanGlycine maxe1
- Treatment
- UV-Be0
- Outcome
- quantities of photosynthetic pigmentse0
- Direction
- increasee0
- Qualifier
- tended toe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B tended to increase the quantities of photosynthetic pigments”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Paclobutrazol-treated leaves were significantly thicker than untreated leaves.
- Taxon
- soybeanGlycine maxe1
- Treatment
- paclobutrazol-treatede0
- Outcome
- leavese0
- Direction
- thickere0
- Comparator
- nontreated seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaves from paclobutrazol-treated seedlings were significantly thicker than those of nontreated seedlings”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
Paclobutrazol-treated seedlings had denser epicuticular wax layers than controls.
- Taxon
- soybeanGlycine maxe2
- Treatment
- paclobutrazol-treatede1
- Outcome
- epicuticular wax layerse0
- Direction
- much densere0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treated seedlings had much denser epicuticular wax layers than the controls”
e1“In contrast, paclobutrazol-treated seedlings”
e2“soybean (Glycine max L. cv. AC Bravor) seedlings”
Claim · model-written summary
UV-B and paclobutrazol caused no significant protein-expression changes.
- Taxon
- soybeanGlycine maxe1
- Treatment
- elevated UV-B and (or) paclobutrazole0
- Outcome
- protein expressione0
- Direction
- No significant changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant changes in protein expression occurred during exposure to elevated UV-B and (or) paclobutrazol”
e1“soybean (Glycine max L. cv. AC Bravor) seedlings”
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See all 28 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.