Abstract
It is known that the coffee ( Coffea arabica L.) plant which is originally from shade habitats would have a limited ability to grow under full sun. Previous work has shown that nitrogen fertilisation can reduce the leaf damage when the plants are exposed to high light intensities during several days. In the present work we aimed to study the effects of the high irradiance during the first hours and evaluate the positive contribution of nitrogen fertilisation in the case of short‐term exposure to strong light. Young plants (1.5–2 years old) grown in 1.5 kg of a mixed soil were supplemented with a nutrient solution containing 15 m M nitrogen in the form of NH 4 NO 3 , every 7 days (2N treatment), 15 days (1N treatment) and 45 days (0N treatment). Top mature leaves were exposed to a photosynthetic photon flux density of 1 500 μmol m −2 s −1 for a maximal period of 8 h, and changes in photosynthesis and pigment composition were monitored along the period of high light exposure. Photosynthetic capacity, leaf conductance to water vapour, electron transport capacity and maximum carboxylation activity, as well as some leaf fluorescence parameters (minimal fluorescence, photochemical efficiency of PSII and quantum yield of photosynthetic electron transport) were reduced by the stress, with a generally stronger impact observed in the 0N plants. The photochemical quenching was affected only in the 0N plants, while the non‐photochemical quenching increased in 2N plants but decreased in the 0N ones. The results showed that 2N plants presented a better initial status of the photosynthetic parameters and of the content of photoprotective pigments. Those plants showed ability to trigger some protective mechanisms, as observed by the tendency to increase the xanthophyll pool content, specially in zeaxanthin and in non‐photochemical quenching. Also, protein content presented a tendency to increase after 1.5 h, which was maintained until the end of the high light period. We conclude that nitrogen availability is a key factor in the acclimation process to high light.
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Claims 10
Claim · model-written summary
High light reduced photosynthetic capacity, leaf conductance and electron transport capacity.
- Taxon
- Coffea arabica L.
Coffea arabicae1 - Treatment
- high lightt0
- Outcome
- Photosynthetic capacity, leaf conductance to water vapour, electron transport capacitye0
- Direction
- reducede0
- Qualifier
- stronger impact observed in the 0N plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic capacity, leaf conductance to water vapour, electron transport capacity and maximum carboxylation activity, as well as some leaf fluorescence parameters (minimal fluorescence, photochemical efficiency of PSII and quantum yield of photosynthetic electron transport) were reduced by the stress, with a generally stronger impact observed in the 0N plants.”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
Claim · model-written summary
High light reduced maximum carboxylation activity.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Treatment
- high lightt0
- Outcome
- maximum carboxylation activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic capacity, leaf conductance to water vapour, electron transport capacity and maximum carboxylation activity, as well as some leaf fluorescence parameters (minimal fluorescence, photochemical efficiency of PSII and quantum yield of photosynthetic electron transport) were reduced by the stress, with a generally stronger impact observed in the 0N plants.”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
Claim · model-written summary
High light reduced minimal fluorescence, PSII efficiency and quantum yield of electron transport.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Treatment
- high lightt0
- Outcome
- minimal fluorescence, photochemical efficiency of PSII and quantum yield of photosynthetic electron transporte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic capacity, leaf conductance to water vapour, electron transport capacity and maximum carboxylation activity, as well as some leaf fluorescence parameters (minimal fluorescence, photochemical efficiency of PSII and quantum yield of photosynthetic electron transport) were reduced by the stress, with a generally stronger impact observed in the 0N plants.”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
Claim · model-written summary
High light affected photochemical quenching only in 0N plants.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Material
- 0N plantse0
- Treatment
- high lightt0
- Outcome
- photochemical quenchinge0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photochemical quenching was affected only in the 0N plants”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
Claim · model-written summary
High light increased non-photochemical quenching in 2N plants.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Material
- 2N plantse0
- Treatment
- high lightt0
- Outcome
- non‐photochemical quenchinge0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non‐photochemical quenching increased in 2N plants but decreased in the 0N ones.”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
Claim · model-written summary
High light decreased non-photochemical quenching in 0N plants.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Material
- 0N onese0
- Treatment
- high lightt0
- Outcome
- non‐photochemical quenchinge0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non‐photochemical quenching increased in 2N plants but decreased in the 0N ones.”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
Claim · model-written summary
The 2N plants had better initial photosynthetic status and photoprotective pigment content.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Material
- 2N plantse0
- Outcome
- photosynthetic parameters and of the content of photoprotective pigmentse0
- Direction
- bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“2N plants presented a better initial status of the photosynthetic parameters and of the content of photoprotective pigments.”
e1“coffee ( Coffea arabica L.) plant”
Claim · model-written summary
In 2N plants, the xanthophyll pool, especially zeaxanthin, tended to increase under high light.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Material
- 2N plantse2
- Treatment
- high lightt0
- Outcome
- xanthophyll pool content, specially in zeaxanthine0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tendency to increase the xanthophyll pool content, specially in zeaxanthin and in non‐photochemical quenching.”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
e2“non‐photochemical quenching increased in 2N plants but decreased in the 0N ones.”
Claim · model-written summary
Leaf protein content tended to increase after 1.5 hours and remained elevated through exposure.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Treatment
- high lightt0
- Outcome
- protein contente0
- Direction
- increasee0
- Qualifier
- after 1.5 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protein content presented a tendency to increase after 1.5 h, which was maintained until the end of the high light period.”
e1“coffee ( Coffea arabica L.) plant”
t0“high light exposure”
Claim · model-written summary
Nitrogen availability was judged key to high-light acclimation.
- Taxon
- Coffea arabica L.Coffea arabicae1
- Outcome
- acclimation process to high lighte0
- Qualifier
- nitrogen availabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen availability is a key factor in the acclimation process to high light”
e1“coffee ( Coffea arabica L.) plant”
The same questions in other papers
light · physiology: photosynthesis · Coffea arabica (arabica coffee)Positive and negative results
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- negative
- positive
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1 paper more in this group
See all 5 papers →light · molecular: metabolites · Coffea arabica (arabica coffee)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.