Abstract
The different phases of development of the apical meristem in two ecotypes of Arabidopsis thaliana (L.) Heynh. [one French (a quantitative long‐day plant), the other one Swedish (an absolutely cond‐requiring plant)] were established, under conditions either inductive or not inductive of flowering. Then the effects of gibberellins (GA 3 , GA 4/7 ) and cytokinin (6‐BA) on these ecotypes were studied at different stages of their ontogenic development. The rate of plant growth was estimated by measuring the plastochron duration. The activities of the different apical zones were determined with cytochemical methods and by histoautoradiography after incorporation of 3H‐thymidine into DNA. When treated during the vegetative stage, i.e. at a young age (French ecotype) or in absence of cold treatment (Swedish ecotype) flowering was not induced. The tested chemicals had similar effects: at first a stimulation of the phylogenetic activity of the cells of the lateral zone and of the rib meristem and, after extended treatments, a differentiation of the axial cells of the meristem and, as a result, an inhibition of flowering. On the other hand, the different hormonal applications on meristems which have reached the intermediate stage, were effective in inducing the reproductive state. The activity of the central cells already in the process of dedifferentiation was increased and, by this, flowering was promoted.
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Claims 6
Claim · model-written summary
Gibberellin and cytokinin treatment during the vegetative stage did not induce flowering in Arabidopsis thaliana ecotypes.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Material
- French ecotypee1
- Organ / stage
- vegetative stagee1
- Treatment
- gibberellinse2
- Outcome
- floweringe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two ecotypes of Arabidopsis thaliana (L.) Heynh.”
e1“When treated during the vegetative stage, i.e. at a young age (French ecotype) or in absence of cold treatment (Swedish ecotype) flowering was not induced”
e2“Then the effects of gibberellins (GA 3 , GA 4/7 )”
Claim · model-written summary
The tested chemicals initially stimulated phylogenetic activity of the cells of the lateral zone and rib meristem.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Organ / stage
- lateral zonee3
- Treatment
- tested chemicalse3
- Outcome
- phylogenetic activity of the cellse3
- Direction
- stimulatione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two ecotypes of Arabidopsis thaliana (L.) Heynh.”
e3“The tested chemicals had similar effects: at first a stimulation of the phylogenetic activity of the cells of the lateral zone and of the rib meristem”
Claim · model-written summary
After extended treatments the tested chemicals caused differentiation of axial meristem cells and inhibited flowering.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Organ / stage
- axial cells of the meristeme4
- Treatment
- extended treatmentse4
- Outcome
- floweringe4
- Direction
- inhibitione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two ecotypes of Arabidopsis thaliana (L.) Heynh.”
e4“after extended treatments, a differentiation of the axial cells of the meristem and, as a result, an inhibition of flowering”
Claim · model-written summary
Hormonal applications on meristems at the intermediate stage were effective in inducing the reproductive state.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Organ / stage
- meristems which have reached the intermediate stagee5
- Treatment
- hormonal applicationse5
- Outcome
- reproductive statee5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two ecotypes of Arabidopsis thaliana (L.) Heynh.”
e5“the different hormonal applications on meristems which have reached the intermediate stage, were effective in inducing the reproductive state”
Claim · model-written summary
The activity of the central cells already in dedifferentiation increased.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Organ / stage
- central cellse6
- Outcome
- activity of the central cellse6
- Direction
- increasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two ecotypes of Arabidopsis thaliana (L.) Heynh.”
e6“The activity of the central cells already in the process of dedifferentiation was increased”
Claim · model-written summary
Hormonal applications promoted flowering through the increased activity of central meristem cells.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- hormonal applicationse5
- Outcome
- floweringe7
- Direction
- promotede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two ecotypes of Arabidopsis thaliana (L.) Heynh.”
e5“the different hormonal applications on meristems which have reached the intermediate stage”
e7“by this, flowering was promoted”
The same questions in other papers
class · phenology · Arabidopsis thaliana (thale cress)Positive and negative results
1 in the opposite direction
- positive
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.