Abstract
The influence of phytochrome B overproduction in 50- to 60-day-old transgenic potato plants (Solanum tuberosum L., lines Dara 5 and Dara 12 with moderate and intense expression of PHYB, respectively) on the resistance of photosynthetic apparatus to UV-B irradiation was investigated. In plants unexposed to UV-B, there was no significant difference in photosynthetic rates (P n) and fluorescence parameters (F v/F m, qN, qP) between the nontransformed (NT) line and Dara-5 and Dara-12 lines, whereas the content of photosynthetic pigments per 1 cm2 leaf area was higher in the transgenic plants. Irradiation with UV-B resulted in the decrease in photosynthetic rate in NT plants by 35–45%, whereas in Dara-12 line this rate was lowered by only 20–25%. Exposure to UV-B reduced the amplitudes of both fast and slow components of delayed fluorescence (DF), which indicated the diminished efficiency of photosystem II (PSII). The decrease in the maximum amplitude of the slow DF component was markedly lower in Dara-12 (19%) than in NT line (33%). The maximal photochemical quantum yield of PSII (F v/F m ratio) in plants exposed to UV-B was also suppressed stronger in NT line than in Dara-12. The line Dara-5 had intermediate position among other lines in terms of UV-B resistance of photosynthesis and PSII activity, but it was closer to NT than to Dara-12. Thus, the potato plants actively expressing the gene of Arabidopsis phytochrome B apoprotein (PHYB) demonstrated a higher resistance of photosynthetic apparatus to UV-B radiation compared to nontransformed plants. The elevated UV-B tolerance is most likely related to the increased leaf content of chlorophyll, carotenoids, and flavonoids.
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Claims 10
Claim · model-written summary
Unexposed lines had no significant photosynthetic rate or fluorescence differences.
- Taxon
- potato
Solanum tuberosumt0 - Outcome
- photosynthetic rates (P n) and fluorescence parameters (F v/F m, qN, qP)e0
- Comparator
- nontransformed (NT) linee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant difference in photosynthetic rates (P n) and fluorescence parameters (F v/F m, qN, qP) between the nontransformed (NT) line and Dara-5 and Dara-12 lines”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
Transgenic plants had higher photosynthetic pigment content.
- Taxon
- potatoSolanum tuberosumt0
- Material
- transgenic plantse0
- Outcome
- content of photosynthetic pigmentse0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of photosynthetic pigments per 1 cm2 leaf area was higher in the transgenic plants”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
UV-B decreased NT photosynthetic rate by 35–45%.
- Taxon
- potatoSolanum tuberosumt0
- Material
- NT plantse0
- Treatment
- Irradiation with UV-Be0
- Outcome
- photosynthetic ratee0
- Direction
- decreasee0
- Value
- 35–45%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irradiation with UV-B resulted in the decrease in photosynthetic rate in NT plants by 35–45%”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
UV-B decreased Dara-12 photosynthetic rate by 20–25%.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Dara-12 linee0
- Treatment
- UV-Be0
- Outcome
- this ratee0
- Direction
- lowerede0
- Value
- 20–25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irradiation with UV-B resulted in the decrease in photosynthetic rate in NT plants by 35–45%, whereas in Dara-12 line this rate was lowered by only 20–25%”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
UV-B reduced fast and slow delayed fluorescence.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- UV-Be0
- Outcome
- amplitudes of both fast and slow components of delayed fluorescence (DF)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to UV-B reduced the amplitudes of both fast and slow components of delayed fluorescence (DF)”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
Slow fluorescence amplitude declined 19% in Dara-12.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Dara-12e0
- Outcome
- maximum amplitude of the slow DF componente0
- Direction
- decreasee0
- Value
- 19%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in the maximum amplitude of the slow DF component was markedly lower in Dara-12 (19%) than in NT line (33%)”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
Slow fluorescence amplitude declined 33% in NT.
- Taxon
- potatoSolanum tuberosumt0
- Material
- NT linee0
- Outcome
- maximum amplitude of the slow DF componente0
- Direction
- decreasee0
- Value
- 33%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in the maximum amplitude of the slow DF component was markedly lower in Dara-12 (19%) than in NT line (33%)”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
UV-B suppressed PSII quantum yield more strongly in NT.
- Taxon
- potatoSolanum tuberosumt0
- Material
- NT linee0
- Outcome
- maximal photochemical quantum yield of PSII (F v/F m ratio)e0
- Direction
- suppressed strongere0
- Comparator
- Dara-12e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximal photochemical quantum yield of PSII (F v/F m ratio) in plants exposed to UV-B was also suppressed stronger in NT line than in Dara-12”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
Dara-5 had intermediate UV-B resistance.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Dara-5e0
- Outcome
- UV-B resistance of photosynthesis and PSII activitye0
- Comparator
- NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The line Dara-5 had intermediate position among other lines in terms of UV-B resistance of photosynthesis and PSII activity, but it was closer to NT than to Dara-12”
t0“transgenic potato plants (Solanum tuberosum L.”
Claim · model-written summary
Higher pigment content was proposed to explain UV-B tolerance.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- UV-B tolerancee0
- Qualifier
- increased leaf content of chlorophyll, carotenoids, and flavonoidse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated UV-B tolerance is most likely related to the increased leaf content of chlorophyll, carotenoids, and flavonoids”
t0“transgenic potato plants (Solanum tuberosum L.”
The same questions in other papers
uv · physiology: photosynthesis · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
radiation · physiology: photosynthesis · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.