Abstract
Interveinal strips (10 x 1.5 mm) excised from growing tobacco (Nicotiana tabacum L. cv Xanthi) leaves have an auxin-specific, epinastic growth response that is developmentally regulated and is not the result of ethylene induction (C.P. Keller, E. Van Volkenburgh [1997] Plant Physiol 113: 603-610). We report here that auxin (10 &mgr;M naphthalene acetic acid) treatment of strips does not result in plasma membrane hyperpolarization or detectable proton efflux. This result is in contrast to the expected responses elicited by 1 &mgr;M fusicoccin (FC) treatment, which in other systems mimics auxin growth promotion through stimulation of the plasma membrane H+-ATPase and resultant acid wall loosening; FC produced both hyperpolarization and proton efflux in leaf strips. FC-induced growth was much more inhibited by a strong neutral buffer than was auxin-induced growth. Measurements of the osmotic concentration of strips suggested that osmotic adjustment plays no role in the auxin-induced growth response. Although cell wall loosening of some form appears to be involved, taken together, our results suggest that auxin-induced growth stimulation of tobacco leaf strips results primarily from a mechanism not involving acid growth.
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Claims 6
Claim · model-written summary
Auxin treatment caused no plasma membrane hyperpolarization.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- auxin (10 &mgr;M naphthalene acetic acid)e0
- Outcome
- plasma membrane hyperpolarizatione0
- Direction
- does not resulte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Tissues”
e0“auxin (10 &mgr;M naphthalene acetic acid) treatment of strips does not result in plasma membrane hyperpolarization”
Claim · model-written summary
Auxin treatment caused no detectable proton efflux.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- auxin (10 &mgr;M naphthalene acetic acid)e0
- Outcome
- detectable proton effluxe0
- Direction
- does not resulte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Tissues”
e0“auxin (10 &mgr;M naphthalene acetic acid) treatment of strips does not result in plasma membrane hyperpolarization or detectable proton efflux.”
Claim · model-written summary
Fusicoccin produced hyperpolarization and proton efflux.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- FCe0
- Outcome
- hyperpolarization and proton effluxe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Tissues”
e0“FC produced both hyperpolarization and proton efflux in leaf strips.”
Claim · model-written summary
Neutral buffer inhibited FC induced growth more than auxin induced growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- strong neutral buffere0
- Outcome
- FC-induced growthe0
- Direction
- much more inhibitede0
- Comparator
- auxin-induced growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Tissues”
e0“FC-induced growth was much more inhibited by a strong neutral buffer than was auxin-induced growth.”
Claim · model-written summary
Osmotic adjustment appeared to play no role in auxin induced growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- auxin-induced growth responsee0
- Qualifier
- osmotic adjustment plays no rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Tissues”
e0“osmotic adjustment plays no role in the auxin-induced growth response.”
Claim · model-written summary
Auxin induced growth was interpreted to arise chiefly without acid growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- auxin-induced growth stimulatione0
- Qualifier
- mechanism not involving acid growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Tissues”
e0“auxin-induced growth stimulation of tobacco leaf strips results primarily from a mechanism not involving acid growth.”
The same questions in other papers
1-naphthaleneacetic acid · molecular: metabolites · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
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See all 8 papers →buffer · growth · Nicotiana tabacum (tobacco)Results agree
1 paper in the same direction as this paper
- no effect
class · molecular: metabolites · Nicotiana tabacum (tobacco)Positive and negative results
4 papers in the same direction as this paper · 9 in the opposite direction
- negative
- positive
- positive
10 papers more in this group
See all 14 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.