Abstract
The development of the cambium in the interfascicular region of young castor bean hypocotyls was investigated under various experimental conditions. The cotyledons were found to be indispensable for the onset of cambial development. Young isolated hypocotyls developed a cambium when cultured in a simple medium lacking phytohormones but fortified with sucrose. Addition of indole-3-acetic acid to the medium did not enhance the rate of cambial development. When 2,3,5-triiodobenzoic acid was added, the typical acropetal extension of cambial development in the hypocotyl was maintained. Gibberellic acid (GA3) was found to have strong stimulatory properties, and, when combined with sucrose, to be capable of inducing a rate of cambial development comparable to that in the intact plant. Inhibitors of gibberellin biosynthesis applied to a hypocotyl-cotyledon system cultured in vitro or sprayed on the cotyledon of a decapitated seedling in vivo, depressed cambial development in the hypocotyl. Simultaneous application of gibberellic acid in the spray experiments restored the original level of cambial development. The significance of the present findings is discussed in relation to the prevailing concept of cambial stimulation.
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Claims 7
Claim · model-written summary
Cotyledons are indispensable for the onset of cambial development in castor bean hypocotyls.
- Taxon
- RICINUS COMMUNIS
Ricinus communist0 - Treatment
- cotyledonse2
- Outcome
- onset of cambial developmente2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICINUS COMMUNIS”
e2“The cotyledons were found to be indispensable for the onset of cambial development”
Claim · model-written summary
Isolated young hypocotyls developed a cambium when cultured in a simple medium with sucrose and no phytohormones.
- Taxon
- RICINUS COMMUNISRicinus communist0
- Treatment
- simple medium lacking phytohormones but fortified with sucrosee3
- Outcome
- developed a cambiume3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICINUS COMMUNIS”
e3“Young isolated hypocotyls developed a cambium when cultured in a simple medium lacking phytohormones but fortified with sucrose”
Claim · model-written summary
Indole-3-acetic acid did not enhance the rate of cambial development in castor bean hypocotyls.
- Taxon
- RICINUS COMMUNISRicinus communist0
- Treatment
- indole-3-acetic acide4
- Outcome
- rate of cambial developmente4
- Direction
- did not enhancee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICINUS COMMUNIS”
e4“Addition of indole-3-acetic acid to the medium did not enhance the rate of cambial development”
Claim · model-written summary
2,3,5-triiodobenzoic acid maintained the typical acropetal extension of cambial development in the hypocotyl.
- Taxon
- RICINUS COMMUNISRicinus communist0
- Treatment
- 2,3,5-triiodobenzoic acide5
- Outcome
- acropetal extension of cambial development in the hypocotyle5
- Direction
- maintainede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICINUS COMMUNIS”
e5“When 2,3,5-triiodobenzoic acid was added, the typical acropetal extension of cambial development in the hypocotyl was maintained”
Claim · model-written summary
Gibberellic acid combined with sucrose stimulated the rate of cambial development to a level comparable to the intact plant.
- Taxon
- RICINUS COMMUNISRicinus communist0
- Treatment
- Gibberellic acid (GA3)e6
- Outcome
- rate of cambial developmente6
- Direction
- stimulatorye6
- Qualifier
- comparable to that in the intact plante6
- Comparator
- intact plante6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICINUS COMMUNIS”
e6“Gibberellic acid (GA3) was found to have strong stimulatory properties, and, when combined with sucrose, to be capable of inducing a rate of cambial development comparable to that in the intact plant”
Claim · model-written summary
Inhibitors of gibberellin biosynthesis depressed cambial development in the hypocotyl when applied in vitro or in vivo.
- Taxon
- RICINUS COMMUNISRicinus communist0
- Treatment
- Inhibitors of gibberellin biosynthesise7
- Outcome
- cambial development in the hypocotyle7
- Direction
- depressede7
- Setting
- in vitroe7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICINUS COMMUNIS”
e7“Inhibitors of gibberellin biosynthesis applied to a hypocotyl-cotyledon system cultured in vitro or sprayed on the cotyledon of a decapitated seedling in vivo, depressed cambial development in the hypocotyl”
Claim · model-written summary
Simultaneous gibberellic acid application restored the original level of cambial development after gibberellin-biosynthesis inhibition.
- Taxon
- RICINUS COMMUNISRicinus communist0
- Treatment
- gibberellic acide0
- Outcome
- original level of cambial developmente0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICINUS COMMUNIS”
e0“Simultaneous application of gibberellic acid in the spray experiments restored the original level of cambial development”
The same questions in other papers
indole-3-acetic acid · growth · Ricinus communis (castor bean)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →Gibberellic acid · growth · Ricinus communis (castor bean)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
class · growth · Ricinus communis (castor bean)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.