Abstract
Photosynthetic parameters were determined in disks from leaves of C. arabica cv. Red CatuaĂ and C. canephora cv. Kouillou grown in the field. Kouillou showed a relatively higher irradiance requirement for saturating photosynthesis, lower chlorophyll (Chl) content, and higher Chl a/b ratio than CatuaĂ. Photoinhibition of photosynthesis under bright irradiance was manifested by decreases in maximum photochemical efficiency (evaluated by the variable to maximum fluorescence ratio, Fv/Fm), as a consequence of an increased initial and a quenched maximum fluorescence. Restoration of Fv/Fm following photoinhibition in low irradiance was faster in Kouillou than in CatuaĂ. Chloramphenicol both accelerated photoinhibition (mainly in Kouillou) and blocked its recovery for at least 190 min in either cultivar. Photosynthetic oxygen evolution under photoinhibitory conditions was decreased by chloramphenicol; in control leaf disks this decrease was only observed in C. arabica, but with a rapid recovery within 90 min of low irradiance exposure. In both coffee cultivars, the depressed photochemical efficiency of photosystem 2 was not accompanied by a concomitant lowering in oxygen evolution during reversal from photoinhibition.
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Claims 11
Claim · model-written summary
Kouillou required higher irradiance to saturate photosynthesis than CatuaĂ.
- Taxon
- C. canephora
Coffea canephorat0 - Material
- Kouilloue0
- Outcome
- irradiance requirement for saturating photosynthesise0
- Direction
- highere0
- Comparator
- CatuaĂe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kouillou showed a relatively higher irradiance requirement for saturating photosynthesis, lower chlorophyll (Chl) content, and higher Chl a/b ratio than CatuaĂ”
t0“C. canephora”
Claim · model-written summary
Kouillou had lower chlorophyll content than CatuaĂ.
- Taxon
- C. canephoraCoffea canephorat0
- Material
- Kouilloue0
- Outcome
- chlorophyll (Chl) contente0
- Direction
- lowere0
- Comparator
- CatuaĂe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kouillou showed a relatively higher irradiance requirement for saturating photosynthesis, lower chlorophyll (Chl) content, and higher Chl a/b ratio than CatuaĂ”
t0“C. canephora”
Claim · model-written summary
Kouillou had a higher chlorophyll a/b ratio than CatuaĂ.
- Taxon
- C. canephoraCoffea canephorat0
- Material
- Kouilloue0
- Outcome
- Chl a/b ratioe0
- Direction
- highere0
- Comparator
- CatuaĂe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kouillou showed a relatively higher irradiance requirement for saturating photosynthesis, lower chlorophyll (Chl) content, and higher Chl a/b ratio than CatuaĂ”
t0“C. canephora”
Claim · model-written summary
Bright irradiance lowered maximum photochemical efficiency through fluorescence changes.
- Taxon
- Coffea arabica and C. canephora
Coffea arabicaCoffea canephorat0 - Treatment
- bright irradiancee0
- Outcome
- maximum photochemical efficiencye0
- Direction
- decreasese0
- Qualifier
- increased initial and a quenched maximum fluorescencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photoinhibition of photosynthesis under bright irradiance was manifested by decreases in maximum photochemical efficiency (evaluated by the variable to maximum fluorescence ratio, Fv/Fm), as a consequence of an increased initial and a quenched maximum fluorescence”
t0“Coffea arabica and C. canephora”
Claim · model-written summary
Fv/Fm recovered faster under low irradiance in Kouillou than CatuaĂ.
- Taxon
- C. canephoraCoffea canephorat0
- Material
- Kouilloue0
- Outcome
- Restoration of Fv/Fme0
- Direction
- fastere0
- Qualifier
- low irradiancee0
- Comparator
- CatuaĂe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Restoration of Fv/Fm following photoinhibition in low irradiance was faster in Kouillou than in CatuaĂ”
t0“C. canephora”
Claim · model-written summary
Chloramphenicol accelerated photoinhibition, mainly in Kouillou.
- Taxon
- Coffea arabica and C. canephoraCoffea arabicaCoffea canephorat0
- Treatment
- Chloramphenicole0
- Outcome
- photoinhibitione0
- Direction
- acceleratede0
- Qualifier
- mainly in Kouilloue0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chloramphenicol both accelerated photoinhibition (mainly in Kouillou) and blocked its recovery for at least 190 min in either cultivar”
t0“Coffea arabica and C. canephora”
Claim · model-written summary
Chloramphenicol blocked recovery from photoinhibition for at least 190 min in both cultivars.
- Taxon
- Coffea arabica and C. canephoraCoffea arabicaCoffea canephorat0
- Treatment
- Chloramphenicole0
- Outcome
- recoverye0
- Direction
- blockede0
- Value
- at least 190 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chloramphenicol both accelerated photoinhibition (mainly in Kouillou) and blocked its recovery for at least 190 min in either cultivar”
t0“Coffea arabica and C. canephora”
Claim · model-written summary
Chloramphenicol decreased oxygen evolution under photoinhibitory conditions.
- Taxon
- Coffea arabica and C. canephoraCoffea arabicaCoffea canephorat0
- Treatment
- chloramphenicole0
- Outcome
- Photosynthetic oxygen evolutione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic oxygen evolution under photoinhibitory conditions was decreased by chloramphenicol”
t0“Coffea arabica and C. canephora”
Claim · model-written summary
Without chloramphenicol, photoinhibition decreased oxygen evolution only in C. arabica.
- Taxon
- C. arabicaCoffea arabicae0
- Outcome
- this decreasee0
- Direction
- decreasee0
- Qualifier
- control leaf diskse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in control leaf disks this decrease was only observed in C. arabica, but with a rapid recovery within 90 min of low irradiance exposure”
Claim · model-written summary
Control C. arabica oxygen evolution recovered within 90 min of low irradiance.
- Taxon
- C. arabicaCoffea arabicae0
- Outcome
- rapid recoverye0
- Value
- within 90 mine0
- Qualifier
- low irradiance exposuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in control leaf disks this decrease was only observed in C. arabica, but with a rapid recovery within 90 min of low irradiance exposure”
Claim · model-written summary
Recovery of photochemical efficiency in both cultivars was not accompanied by lower oxygen evolution.
- Outcome
- oxygen evolutione0
- Direction
- not accompanied by a concomitant loweringe0
- Qualifier
- during reversal from photoinhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both coffee cultivars, the depressed photochemical efficiency of photosystem 2 was not accompanied by a concomitant lowering in oxygen evolution during reversal from photoinhibition”
The same questions in other papers
light · physiology: photosynthesis · Coffea canephora (robusta coffee)Positive and negative results
1 in the opposite direction
- positive
light · physiology: photosynthesis · Coffea arabica (arabica coffee)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.