Abstract
• Here, using light microscopy, we studied the cellular basis of growth of Arabidopsis cotyledons during postembryonic development. • Analysis of serial paradermal sections of developing cotyledons revealed that early growth involved cell enlargement and some cell division. The daughter cells remained tightly packed in growing clusters, which enabled us to monitor both divisions and cell enlargement. • By contrast to other epigeal cotyledons, cells of all mesophyll layers could enter division. The cells in the cotyledon margins displayed a higher proliferative activity; however, the orientation of the division plane did not permit cells at the margins to give rise to tissue internally, nor to generate new cell layers. Exogenous cytokinin stimulated both cell expansion and cell division in attached dark-grown cotyledons. Light stimulated cell growth. Higher-levels of endogenous cytokinins in the amp1 mutant were confirmed to enhance the light-stimulated process of cell enlargement in cotyledons of dark-grown seedlings. • This work demonstrates an approach to use Arabidopsis cotyledons as an experimental system and provides a framework for molecular–genetic analysis of cellular dynamics during the growth of this organ.
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Claims 7
Claim · model-written summary
Early cotyledon growth involved cell enlargement and some cell division.
- Taxon
- Arabidopsis
Arabidopsist0 - Organ / stage
- cotyledonse1
- Outcome
- cell enlargement and some cell divisione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cell division and cell expansion in cotyledons of Arabidopsis seedlings”
e1“Analysis of serial paradermal sections of developing cotyledons revealed that early growth involved cell enlargement and some cell division”
Claim · model-written summary
Cells of all mesophyll layers could enter division, unlike other epigeal cotyledons.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- mesophyll layerse2
- Outcome
- enter divisione2
- Comparator
- other epigeal cotyledonse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cell division and cell expansion in cotyledons of Arabidopsis seedlings”
e2“By contrast to other epigeal cotyledons, cells of all mesophyll layers could enter division”
Claim · model-written summary
Cells in the cotyledon margins showed a higher proliferative activity.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- cotyledon marginse3
- Outcome
- proliferative activitye3
- Direction
- highere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cell division and cell expansion in cotyledons of Arabidopsis seedlings”
e3“The cells in the cotyledon margins displayed a higher proliferative activity”
Claim · model-written summary
Division-plane orientation at the margins did not let margin cells give rise to internal tissue or new cell layers.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- cells at the marginse4
- Outcome
- give rise to tissue internallye4
- Direction
- did not permite4
- Qualifier
- nor to generate new cell layerse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cell division and cell expansion in cotyledons of Arabidopsis seedlings”
e4“did not permit cells at the margins to give rise to tissue internally, nor to generate new cell layers”
Claim · model-written summary
Exogenous cytokinin stimulated both cell expansion and cell division in attached dark-grown cotyledons.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- attached dark-grown cotyledonse5
- Treatment
- Exogenous cytokinine5
- Outcome
- cell expansion and cell divisione5
- Direction
- stimulatede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cell division and cell expansion in cotyledons of Arabidopsis seedlings”
e5“Exogenous cytokinin stimulated both cell expansion and cell division in attached dark-grown cotyledons”
Claim · model-written summary
Light stimulated cell growth in cotyledons.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Lighte6
- Outcome
- cell growthe6
- Direction
- stimulatede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cell division and cell expansion in cotyledons of Arabidopsis seedlings”
e6“Light stimulated cell growth”
Claim · model-written summary
Higher endogenous cytokinin levels in the amp1 mutant enhanced light-stimulated cell enlargement.
- Taxon
- ArabidopsisArabidopsist0
- Material
- amp1 mutante7
- Treatment
- Higher-levels of endogenous cytokininse7
- Outcome
- process of cell enlargemente7
- Direction
- enhancee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cell division and cell expansion in cotyledons of Arabidopsis seedlings”
e7“Higher-levels of endogenous cytokinins in the amp1 mutant were confirmed to enhance the light-stimulated process of cell enlargement in cotyledons of dark-grown seedlings”
The same questions in other papers
light · growth · ArabidopsisResults differ
26 papers in the same direction as this paper · 16 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
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See all 44 papers →class · cytology · ArabidopsisPositive and negative results
5 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
6 papers more in this group
See all 10 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.