Abstract
Brassinosteroids have been implicated in the differentiation of vascular cell types in herbaceous plants, but their roles during secondary growth and wood formation are not well defined. Here we pharmacologically and genetically manipulated brassinosteroid levels in poplar trees and assayed the effects on secondary growth and wood formation, and on gene expression within stems. Elevated brassinosteroid levels resulted in increases in secondary growth and tension wood formation, while inhibition of brassinosteroid synthesis resulted in decreased growth and secondary vascular differentiation. Analysis of gene expression showed that brassinosteroid action is positively associated with genes involved in cell differentiation and cell-wall biosynthesis. The results presented here show that brassinosteroids play a foundational role in the regulation of secondary growth and wood formation, in part through the regulation of cell differentiation and secondary cell wall biosynthesis.
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Claims 4
Claim · model-written summary
Elevated brassinosteroids increased secondary growth and tension wood formation in poplar.
- Treatment
- Elevated brassinosteroid levelse0
- Outcome
- secondary growth and tension wood formatione0
- Direction
- increasese0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated brassinosteroid levels resulted in increases in secondary growth and tension wood formation”
t0“poplar”
Claim · model-written summary
Inhibiting brassinosteroid synthesis decreased growth and secondary vascular differentiation in poplar.
- Treatment
- inhibition of brassinosteroid synthesise0
- Outcome
- growth and secondary vascular differentiatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of brassinosteroid synthesis resulted in decreased growth and secondary vascular differentiation”
t0“poplar”
Claim · model-written summary
Brassinosteroid action was positively associated with expression of cell differentiation and cell-wall biosynthesis genes.
- Compound
- brassinosteroide0
- Outcome
- genes involved in cell differentiation and cell-wall biosynthesise0
- Direction
- positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“brassinosteroid action is positively associated with genes involved in cell differentiation and cell-wall biosynthesis”
t0“poplar”
Claim · model-written summary
Brassinosteroids regulate secondary growth and wood formation partly through cell differentiation and secondary cell wall biosynthesis.
- Compound
- brassinosteroidse0
- Outcome
- secondary growth and wood formatione0
- Qualifier
- regulation of cell differentiation and secondary cell wall biosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“brassinosteroids play a foundational role in the regulation of secondary growth and wood formation, in part through the regulation of cell differentiation and secondary cell wall biosynthesis”
t0“poplar”
The same questions in other papers
class · growth · Populus (poplar)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 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.