Abstract
In order to obtain an insight into the damage of thylakoid membranes of spruce (Picea abies) trees with damage of varying intensity, investigations were performed on the content of Q в -protein, cytochrome f, and P-700 in chloroplasts of spruce needles from apparently healthy and from damaged trees. Needles from the second and third needle year and the seventh whorl were chosen. The investigations were carried out in 1986 on a 20 to 25-year-old spruce plantation in the Hunsriick mountains and on an 80-year-old spruce plantation in the Westerwald mountains. In damaged trees an unequivocal decrease in the content of Q в -protein, cytochrome f, and P-700 was found, even in needle groups that appear visibly green and healthy. The amount of cytochrome f decreased by 25% per dry weight (approximately to the same extent as chlorophyll); the content of Q в -protein and P-700, however, were more drastically reduced compared to the control trees (about 40% and 50%, respectively). These results of measuring the photosynthetic electron transport components imply that the thylakoid membranes are sites of early injurious effects.
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Claims 4
Claim · model-written summary
The Q в -protein content was reduced in damaged spruce trees compared with control trees, about 40%.
- Taxon
- spruce (Picea abies)
Picea abiese0 - Organ / stage
- spruce needlese0
- Treatment
- damaged treese2
- Outcome
- content of Q в -proteine3
- Direction
- reducede3
- Value
- about 40%e3
- Qualifier
- even in needle groups that appear visibly green and healthye2
- Comparator
- control treese3
- Setting
- Hunsriick mountainse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In order to obtain an insight into the damage of thylakoid membranes of spruce (Picea abies) trees with damage of varying intensity, investigations were performed on the content of Q в -protein, cytochrome f, and P-700 in chloroplasts of spruce needles from apparently healthy and from damaged trees”
e1“The investigations were carried out in 1986 on a 20 to 25-year-old spruce plantation in the Hunsriick mountains and on an 80-year-old spruce plantation in the Westerwald mountains”
e2“In damaged trees an unequivocal decrease in the content of Q в -protein, cytochrome f, and P-700 was found, even in needle groups that appear visibly green and healthy”
e3“The amount of cytochrome f decreased by 25% per dry weight (approximately to the same extent as chlorophyll); the content of Q в -protein and P-700, however, were more drastically reduced compared to the control trees (about 40% and 50%, respectively)”
Claim · model-written summary
The P-700 content was reduced in damaged spruce trees compared with control trees, about 50%.
- Taxon
- spruce (Picea abies)Picea abiese0
- Organ / stage
- spruce needlese0
- Treatment
- damaged treese2
- Outcome
- P-700e3
- Direction
- reducede3
- Value
- 50%e3
- Comparator
- control treese3
- Setting
- Hunsriick mountainse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In order to obtain an insight into the damage of thylakoid membranes of spruce (Picea abies) trees with damage of varying intensity, investigations were performed on the content of Q в -protein, cytochrome f, and P-700 in chloroplasts of spruce needles from apparently healthy and from damaged trees”
e1“The investigations were carried out in 1986 on a 20 to 25-year-old spruce plantation in the Hunsriick mountains and on an 80-year-old spruce plantation in the Westerwald mountains”
e2“In damaged trees an unequivocal decrease in the content of Q в -protein, cytochrome f, and P-700 was found, even in needle groups that appear visibly green and healthy”
e3“The amount of cytochrome f decreased by 25% per dry weight (approximately to the same extent as chlorophyll); the content of Q в -protein and P-700, however, were more drastically reduced compared to the control trees (about 40% and 50%, respectively)”
Claim · model-written summary
Cytochrome f decreased by 25% per dry weight in damaged spruce trees.
- Taxon
- spruce (Picea abies)Picea abiese0
- Organ / stage
- spruce needlese0
- Treatment
- damaged treese2
- Outcome
- cytochrome fe3
- Direction
- decreasede3
- Value
- 25%e3
- Qualifier
- per dry weighte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In order to obtain an insight into the damage of thylakoid membranes of spruce (Picea abies) trees with damage of varying intensity, investigations were performed on the content of Q в -protein, cytochrome f, and P-700 in chloroplasts of spruce needles from apparently healthy and from damaged trees”
e2“In damaged trees an unequivocal decrease in the content of Q в -protein, cytochrome f, and P-700 was found, even in needle groups that appear visibly green and healthy”
e3“The amount of cytochrome f decreased by 25% per dry weight (approximately to the same extent as chlorophyll); the content of Q в -protein and P-700, however, were more drastically reduced compared to the control trees (about 40% and 50%, respectively)”
Claim · model-written summary
Thylakoid membranes are suggested to be sites of early injurious effects in spruce.
- Taxon
- spruce (Picea abies)Picea abiese0
- Outcome
- early injurious effectse4
- Qualifier
- thylakoid membranes are sites of early injurious effectse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In order to obtain an insight into the damage of thylakoid membranes of spruce (Picea abies) trees with damage of varying intensity, investigations were performed on the content of Q в -protein, cytochrome f, and P-700 in chloroplasts of spruce needles from apparently healthy and from damaged trees”
e4“These results of measuring the photosynthetic electron transport components imply that the thylakoid membranes are sites of early injurious effects”