Abstract
Although the beneficial role of Fe, Zn, and Mn on many physiological and biochemical processes is well established, effects of each of these elements on chlorophyll (Chl) a fluorescence and photosynthetic pigment contents is not well studied. The objective of this study was to evaluate effects of Fe, Zn, and Mn deficiency in two lettuce cultivars. The parameters investigated could serve also as physiological and biochemical markers in order to identify stress-tolerant cultivars. Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars. Chl a fluorescence parameters including maximal quantum yield of PSII photochemistry and performance index decreased under micronutrient deficiency, while relative variable fluorescence at J-step and minimal fluorescence yield of the dark-adapted state increased under such conditions in both cultivars. Micronutrient deficiency also reduced all parameters of quantum yield and specific energy fluxes excluding quantum yield of energy dissipation, quantum yield of reduction of end electron acceptors at the PSI, and total performance index for the photochemical activity. Osmoregulators, such as proline, soluble sugar, and total phenols were enhanced in plants grown under micronutrient deficiency. Fe, Zn, and Mn deficiency led to a lesser production of dry mass. The Fe deficiency was more destructive than that of Zn and Mn on the efficiency of PSII in both lettuce cultivars. Our results suggest that the leaf lettuce, which showed a higher efficiency of PSII, electron transport, quantum yield, specific energy fluxes, and osmoregulators under micronutrient deficiency, was more tolerant to stress conditions than crisphead lettuce.
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Claims 10
Claim · model-written summary
Microelement shortage significantly decreased photosynthetic pigment contents in both lettuce cultivars.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- microelement shortagee0
- Outcome
- contents of photosynthetic pigmentse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars”
Claim · model-written summary
Micronutrient deficiency decreased maximal quantum yield of PSII photochemistry and performance index in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- micronutrient deficiencye1
- Outcome
- maximal quantum yield of PSII photochemistry and performance indexe1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars”
e1“Chl a fluorescence parameters including maximal quantum yield of PSII photochemistry and performance index decreased under micronutrient deficiency”
Claim · model-written summary
Micronutrient deficiency increased relative variable fluorescence at J-step and minimal fluorescence yield of the dark-adapted state in both lettuce cultivars.
- Taxon
- lettuceLactuca sativae0
- Treatment
- micronutrient deficiencye1
- Outcome
- relative variable fluorescence at J-step and minimal fluorescence yield of the dark-adapted statee2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars”
e1“Chl a fluorescence parameters including maximal quantum yield of PSII photochemistry and performance index decreased under micronutrient deficiency”
e2“relative variable fluorescence at J-step and minimal fluorescence yield of the dark-adapted state increased under such conditions in both cultivars”
Claim · model-written summary
Micronutrient deficiency reduced all parameters of quantum yield and specific energy fluxes, excluding quantum yield of energy dissipation, quantum yield of reduction of end electron acceptors at the PSI and total performance index.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Micronutrient deficiencye3
- Outcome
- all parameters of quantum yield and specific energy fluxese3
- Direction
- reducede3
- Qualifier
- excluding quantum yield of energy dissipation, quantum yield of reduction of end electron acceptors at the PSI, and total performance index for the photochemical activitye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars”
e3“Micronutrient deficiency also reduced all parameters of quantum yield and specific energy fluxes excluding quantum yield of energy dissipation, quantum yield of reduction of end electron acceptors at the PSI, and total performance index for the photochemical activity”
Claim · model-written summary
Micronutrient deficiency enhanced osmoregulators such as proline, soluble sugar and total phenols in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- micronutrient deficiencye4
- Outcome
- Osmoregulatorse4
- Direction
- enhancede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars”
e4“Osmoregulators, such as proline, soluble sugar, and total phenols were enhanced in plants grown under micronutrient deficiency”
Claim · model-written summary
Fe, Zn and Mn deficiency led to a lesser production of dry mass in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Fe, Zn, and Mn deficiencye5
- Outcome
- production of dry masse5
- Direction
- lessere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars”
e5“Fe, Zn, and Mn deficiency led to a lesser production of dry mass”
Claim · model-written summary
Fe deficiency was more destructive to PSII efficiency than Zn and Mn deficiency in both lettuce cultivars.
- Taxon
- lettuceLactuca sativae6
- Treatment
- Fe deficiencye6
- Outcome
- efficiency of PSIIe6
- Direction
- more destructivee6
- Comparator
- that of Zn and Mne6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The Fe deficiency was more destructive than that of Zn and Mn on the efficiency of PSII in both lettuce cultivars”
Claim · model-written summary
Under micronutrient deficiency, leaf lettuce was more tolerant to stress conditions than crisphead lettuce.
- Taxon
- lettuceLactuca sativae7
- Material
- leaf lettucee7
- Treatment
- micronutrient deficiencye7
- Outcome
- more tolerant to stress conditionse7
- Direction
- more tolerante7
- Comparator
- crisphead lettucee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“leaf lettuce, which showed a higher efficiency of PSII, electron transport, quantum yield, specific energy fluxes, and osmoregulators under micronutrient deficiency, was more tolerant to stress conditions than crisphead lettuce”
Claim · model-written summary
Under micronutrient deficiency, leaf lettuce had higher efficiency of PSII, electron transport and quantum yield than crisphead lettuce.
- Taxon
- lettuceLactuca sativae7
- Material
- leaf lettucee7
- Treatment
- micronutrient deficiencye7
- Outcome
- efficiency of PSII, electron transport, quantum yielde7
- Direction
- highere7
- Comparator
- crisphead lettucee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“leaf lettuce, which showed a higher efficiency of PSII, electron transport, quantum yield, specific energy fluxes, and osmoregulators under micronutrient deficiency, was more tolerant to stress conditions than crisphead lettuce”
Claim · model-written summary
Under micronutrient deficiency, leaf lettuce had higher specific energy fluxes and osmoregulators than crisphead lettuce.
- Taxon
- lettuceLactuca sativae7
- Material
- leaf lettucee7
- Treatment
- micronutrient deficiencye7
- Outcome
- specific energy fluxes, and osmoregulatorse7
- Direction
- highere7
- Comparator
- crisphead lettucee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“leaf lettuce, which showed a higher efficiency of PSII, electron transport, quantum yield, specific energy fluxes, and osmoregulators under micronutrient deficiency, was more tolerant to stress conditions than crisphead lettuce”
The same questions in other papers
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1 paper in the same direction as this paper · 2 in the opposite direction
- positive
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This paper is about lacking the nutrient, so it counts the other way round here.
- negative
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1 paper in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
micronutrient · yield · Lactuca sativa (garden lettuce)Positive and negative results
1 in the opposite direction
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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.