Abstract
Respiration rate in light (Rd) and the CO 2 compensation point in absence of Rd (г *) were 0.33μmol·m -2 ·s -1 and 46.5μl·L -1 in leaves of Musa paradisiaca exposed to UV B radiation (4.8μW·cm -2 ) respectivty. They were higher than those in control plants by 5.6% and 10%, respectively. The initial slope of light response curves, the apparent quantum yield (α A) in leaves of control plants was 0.023±0.007 while the relative value was decreased by 13.0% in plants exposed to UV B radiation. A parameter related to the efficiency of light energy conversion (δ) was also decreased by 28.6% for plants exposed to UV B radiation in comparison with that of control plant. The partial An/Ci curves measured under θp 1100μmol·m -2 ·s -1 , was An=0.028Ci+ 1.41 for leaves of control plants and An=0.021Ci+1.01 for leaves exposed to UV B radiation. Maximum carboxylation rate (Vcmax) and electron transport rate in saturated θp in leaves exposed to UV B treatment were also lower than those of controls considerably. The partitioning coefficients for leaf nitrogen in Rubisco (P R) and in bioenergetic (P B) in leaves exposed to UV B radiation were lower than those of controls by 8.1% and 3.0%, respectively. And the fraction of leaf nitrogen in thylakoid light harvesting component (P L) increased finely in plant exposed to UV B radiation as compared to that of controls. The results imply that supplementary UV B radiation cause the decrease of nitrogen partition in the components of photosynthetic carbon cycle and decrease photosynthetic rate.
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Claims 10
Claim · model-written summary
UV-B exposed leaves had a light respiration rate of 0.33μmol·m -2 ·s -1, 5.6% above controls.
- Taxon
- Musa paradisiaca
Musa ×paradisiacae0 - Treatment
- UV B radiation (4.8μW·cm -2 )e0
- Outcome
- Respiration rate in light (Rd)e0
- Direction
- highere0
- Value
- 0.33μmol·m -2 ·s -1e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Respiration rate in light (Rd) and the CO 2 compensation point in absence of Rd (г *) were 0.33μmol·m -2 ·s -1 and 46.5μl·L -1 in leaves of Musa paradisiaca exposed to UV B radiation (4.8μW·cm -2 ) respectivty. They were higher than those in control plants by 5.6% and 10%, respectively.”
Claim · model-written summary
UV-B exposed leaves had a CO2 compensation point of 46.5μl·L -1, 10% above controls.
- Taxon
- Musa paradisiacaMusa ×paradisiacae0
- Treatment
- UV B radiation (4.8μW·cm -2 )e0
- Outcome
- CO 2 compensation point in absence of Rd (г *)e0
- Direction
- highere0
- Value
- 46.5μl·L -1e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Respiration rate in light (Rd) and the CO 2 compensation point in absence of Rd (г *) were 0.33μmol·m -2 ·s -1 and 46.5μl·L -1 in leaves of Musa paradisiaca exposed to UV B radiation (4.8μW·cm -2 ) respectivty. They were higher than those in control plants by 5.6% and 10%, respectively.”
Claim · model-written summary
Apparent quantum yield decreased by 13.0% after UV-B exposure.
Verbatim
e0“apparent quantum yield (α A) in leaves of control plants was 0.023±0.007 while the relative value was decreased by 13.0% in plants exposed to UV B radiation.”
Claim · model-written summary
Light energy conversion efficiency parameter decreased by 28.6% under UV-B.
Verbatim
e0“A parameter related to the efficiency of light energy conversion (δ) was also decreased by 28.6% for plants exposed to UV B radiation in comparison with that of control plant.”
Claim · model-written summary
The An/Ci curve was An=0.021Ci+1.01 under UV-B versus An=0.028Ci+ 1.41 in controls.
- Taxon
- plantsViridiplantaee0
- Treatment
- UV B radiatione0
- Outcome
- An=0.021Ci+1.01e0
- Value
- An=0.021Ci+1.01e0
- Comparator
- control plantse0
Not reportedDirection
Verbatim
e0“was An=0.028Ci+ 1.41 for leaves of control plants and An=0.021Ci+1.01 for leaves exposed to UV B radiation.”
Claim · model-written summary
Maximum carboxylation rate was lower under UV-B than in controls.
- Treatment
- UV B treatmente0
- Outcome
- Maximum carboxylation rate (Vcmax)e0
- Direction
- lowere0
- Comparator
- controlse0
Not reportedTaxon
Verbatim
e0“Maximum carboxylation rate (Vcmax) and electron transport rate in saturated θp in leaves exposed to UV B treatment were also lower than those of controls considerably.”
Claim · model-written summary
Electron transport rate in saturated θp was lower under UV-B than in controls.
- Treatment
- UV B treatmente0
- Outcome
- electron transport rate in saturated θpe0
- Direction
- lowere0
- Comparator
- controlse0
Not reportedTaxon
Verbatim
e0“Maximum carboxylation rate (Vcmax) and electron transport rate in saturated θp in leaves exposed to UV B treatment were also lower than those of controls considerably.”
Claim · model-written summary
Leaf nitrogen partitioning in Rubisco was 8.1% lower under UV-B.
- Treatment
- UV B radiatione0
- Outcome
- leaf nitrogen in Rubisco (P R)e0
- Direction
- lowere0
- Value
- 8.1%e0
- Comparator
- controlse0
Not reportedTaxon
Verbatim
e0“The partitioning coefficients for leaf nitrogen in Rubisco (P R) and in bioenergetic (P B) in leaves exposed to UV B radiation were lower than those of controls by 8.1% and 3.0%, respectively.”
Claim · model-written summary
Leaf nitrogen partitioning in bioenergetic components was 3.0% lower under UV-B.
Not reportedTaxon
Verbatim
e0“The partitioning coefficients for leaf nitrogen in Rubisco (P R) and in bioenergetic (P B) in leaves exposed to UV B radiation were lower than those of controls by 8.1% and 3.0%, respectively.”
Claim · model-written summary
Leaf nitrogen fraction in thylakoid light harvesting components increased under UV-B.
Verbatim
e0“the fraction of leaf nitrogen in thylakoid light harvesting component (P L) increased finely in plant exposed to UV B radiation as compared to that of controls.”
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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.