Abstract
The short-term influence of adequate and high nitrogen fertilization on poplar lignification was investigated. The high nitrogen supply decreased lignin staining in the newly formed secondary xylem, indicating that lignin deposition was affected. Acetyl bromide determinations gave a 9-10% decrease in lignin content; however, Klason lignin content was unchanged. Thioacidolysis showed that elevated N supply affected lignin structure such that there was a reduced frequency of lignin units involved in beta-O-4 bonds, a reduced syringyl/guaiacyl ratio, an increased frequency of p-hydroxyphenyl lignin units, more guaiacyl units with free phenolic groups, and more p-hydroxybenzoic acid ester-linked to poplar lignins. These features suggest that lignins from poplars grown under high N bear structural similarities to lignins formed during early stages of wood development. The findings also indicate that a gravitational stimulus inducing the formation of tension wood and high N availability lead to similar and additive effects on lignin content and structure.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
High nitrogen reduced lignin staining in new secondary xylem.
- Organ / stage
- newly formed secondary xyleme0
- Treatment
- high nitrogen supplye0
- Outcome
- lignin staininge0
- Direction
- decreasede0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“The high nitrogen supply decreased lignin staining in the newly formed secondary xylem, indicating that lignin deposition was affected.”
Claim · model-written summary
High nitrogen reduced acetyl bromide lignin content by 9-10%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“Acetyl bromide determinations gave a 9-10% decrease in lignin content; however, Klason lignin content was unchanged.”
e1“The high nitrogen supply decreased lignin staining in the newly formed secondary xylem, indicating that lignin deposition was affected.”
Claim · model-written summary
High nitrogen left Klason lignin content unchanged.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“Acetyl bromide determinations gave a 9-10% decrease in lignin content; however, Klason lignin content was unchanged.”
e1“The high nitrogen supply decreased lignin staining in the newly formed secondary xylem, indicating that lignin deposition was affected.”
Claim · model-written summary
Elevated nitrogen changed frequency of lignin units involved in beta-O-4 bonds.
- Treatment
- elevated N supplye0
- Outcome
- frequency of lignin units involved in beta-O-4 bondse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“Thioacidolysis showed that elevated N supply affected lignin structure such that there was a reduced frequency of lignin units involved in beta-O-4 bonds, a reduced syringyl/guaiacyl ratio, an increased frequency of p-hydroxyphenyl lignin units, more guaiacyl units with free phenolic groups, and more p-hydroxybenzoic acid ester-linked to poplar lignins.”
Claim · model-written summary
Elevated nitrogen changed syringyl/guaiacyl ratio.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“Thioacidolysis showed that elevated N supply affected lignin structure such that there was a reduced frequency of lignin units involved in beta-O-4 bonds, a reduced syringyl/guaiacyl ratio, an increased frequency of p-hydroxyphenyl lignin units, more guaiacyl units with free phenolic groups, and more p-hydroxybenzoic acid ester-linked to poplar lignins.”
Claim · model-written summary
Elevated nitrogen changed frequency of p-hydroxyphenyl lignin units.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“Thioacidolysis showed that elevated N supply affected lignin structure such that there was a reduced frequency of lignin units involved in beta-O-4 bonds, a reduced syringyl/guaiacyl ratio, an increased frequency of p-hydroxyphenyl lignin units, more guaiacyl units with free phenolic groups, and more p-hydroxybenzoic acid ester-linked to poplar lignins.”
Claim · model-written summary
Elevated nitrogen changed guaiacyl units with free phenolic groups.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“Thioacidolysis showed that elevated N supply affected lignin structure such that there was a reduced frequency of lignin units involved in beta-O-4 bonds, a reduced syringyl/guaiacyl ratio, an increased frequency of p-hydroxyphenyl lignin units, more guaiacyl units with free phenolic groups, and more p-hydroxybenzoic acid ester-linked to poplar lignins.”
Claim · model-written summary
Elevated nitrogen changed p-hydroxybenzoic acid ester-linked to poplar lignins.
- Treatment
- elevated N supplye0
- Outcome
- p-hydroxybenzoic acid ester-linked to poplar ligninse0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“Thioacidolysis showed that elevated N supply affected lignin structure such that there was a reduced frequency of lignin units involved in beta-O-4 bonds, a reduced syringyl/guaiacyl ratio, an increased frequency of p-hydroxyphenyl lignin units, more guaiacyl units with free phenolic groups, and more p-hydroxybenzoic acid ester-linked to poplar lignins.”
Claim · model-written summary
High nitrogen poplar lignins resemble those of early wood development.
- Treatment
- high Ne0
- Outcome
- structural similarities to lignins formed during early stages of wood developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These features suggest that lignins from poplars grown under high N bear structural similarities to lignins formed during early stages of wood development.”
Claim · model-written summary
Gravitational stimulation and high nitrogen have similar and additive effects on lignin content and structure.
- Treatment
- a gravitational stimulus inducing the formation of tension wood and high N availabilitye0
- Outcome
- lignin content and structuree0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar”
e0“The findings also indicate that a gravitational stimulus inducing the formation of tension wood and high N availability lead to similar and additive effects on lignin content and structure.”
The same questions in other papers
nitrogen · molecular: metabolites · Populus (poplar)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
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.