Abstract
Auxin induction of the proliferation of Nicotiana tabacum (cv Xanthi) mesophyll protoplasts and of protoplast-derived cells was studied. The growth-promoting properties and cytotoxicities at high concentrations of IAA and naphthaleneacetic acid were strongly affected by cell density. The induction of growth by 2,4-dichlorophenoxyacetic acid and picloram was not affected by cell density. The comparison of catabolism of these [(14)C]-labeled auxins by protoplasts showed that IAA and naphthalene-acetic acid were rapidly accumulated and conjugated unlike 2,4-dichlorophenoxyacetic acid and picloram. The major catabolite derived from naphthaleneacetic acid was identified as naphthaleneacetyl-l-aspartate. The biosynthesis of this conjugate in protoplasts was inducible by naphthaleneacetic acid concentrations found to be cytotoxic under low density growth conditions. However, although it was taken up by cells, the conjugate was not cytotoxic at concentrations as high as 0.2 mm under low density growth conditions. The relationship between conjugation processes and auxin cytotoxicity is discussed.
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Claims 6
Claim · model-written summary
In tobacco protoplasts, the growth-promoting properties and cytotoxicities of high concentrations of IAA and naphthaleneacetic acid were strongly affected by cell density.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- cell densitye0
- Outcome
- growth-promoting properties and cytotoxicities at high concentrations of IAA and naphthaleneacetic acide0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“The growth-promoting properties and cytotoxicities at high concentrations of IAA and naphthaleneacetic acid were strongly affected by cell density”
Claim · model-written summary
The induction of growth by 2,4-dichlorophenoxyacetic acid and picloram was not affected by cell density.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- cell densitye0
- Outcome
- induction of growth by 2,4-dichlorophenoxyacetic acid and piclorame0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“The induction of growth by 2,4-dichlorophenoxyacetic acid and picloram was not affected by cell density”
Claim · model-written summary
IAA and naphthaleneacetic acid were rapidly accumulated and conjugated by protoplasts, unlike 2,4-dichlorophenoxyacetic acid and picloram.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- rapidly accumulated and conjugatede0
- Comparator
- 2,4-dichlorophenoxyacetic acid and piclorame0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“IAA and naphthalene-acetic acid were rapidly accumulated and conjugated unlike 2,4-dichlorophenoxyacetic acid and picloram”
Claim · model-written summary
The major catabolite derived from naphthaleneacetic acid was identified as naphthaleneacetyl-l-aspartate.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- major catabolite derived from naphthaleneacetic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“The major catabolite derived from naphthaleneacetic acid was identified as naphthaleneacetyl-l-aspartate”
Claim · model-written summary
Biosynthesis of the naphthaleneacetyl-aspartate conjugate in protoplasts was inducible by naphthaleneacetic acid concentrations found to be cytotoxic under low density growth conditions.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- naphthaleneacetic acid concentrations found to be cytotoxic under low density growth conditionse0
- Outcome
- biosynthesis of this conjugatee0
- Direction
- induciblee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“The biosynthesis of this conjugate in protoplasts was inducible by naphthaleneacetic acid concentrations found to be cytotoxic under low density growth conditions”
Claim · model-written summary
The conjugate, although taken up by cells, was not cytotoxic at concentrations as high as 0.2 mm under low density growth conditions.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- conjugatee0
- Outcome
- cytotoxice0
- Direction
- not cytotoxice0
- Value
- 0.2 mme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco”
e0“the conjugate was not cytotoxic at concentrations as high as 0.2 mm under low density growth conditions”
The same questions in other papers
1-naphthaleneacetic acid · molecular: metabolites · Nicotiana tabacum (tobacco)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
4 papers more in this group
See all 8 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.