Abstract
Applications of indole-3yl-acetic acid (IAA) and abscisic acid (ABA) were done on two-day-old intact maize (cv LG 11) roots. The effect of the treatment on the root growth depends on their initial elongation rate. The slow growing roots were all inhibited by exogenous IAA and ABA at any concentrations used whereas for the fast growing roots their elongation was promoted by these two hormones at low concentrations. Quantitative analyses of endogenous IAA and ABA were performed using the gas chromatography-mass spectrometry technique. Detection and quantification of endogenous IAA and ABA were done on the zone of the root implicated in elongation. These techniques were achieved by electron impact on the IAA-Me-heptafluorobutyryl derivative and by negative ion chemical ionization with NH(3) on the ABA-Me ester derivative. A negative correlation between the growth and the endogenous content of these two hormones was obtained. ABA presented a larger range of endogenous level than IAA on the whole population of roots tested. When using applied IAA and ABA at different concentrations the same differentiating effect on the growth was observed. This allowed us to conclude that for identical concentrations, IAA has a more powerful effect on root elongation than ABA. Present results are discussed in relation to previous data related to the role of IAA and ABA in the growth and gravireaction of maize roots.
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Claims 7
Claim · model-written summary
IAA inhibited slow-growing maize roots at all tested concentrations.
- Treatment
- exogenous IAAe0
- Outcome
- slow growing rootse0
- Direction
- inhibitede0
- Qualifier
- at any concentrations usede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The slow growing roots were all inhibited by exogenous IAA and ABA at any concentrations used”
t0“two-day-old intact maize (cv LG 11) roots”
Claim · model-written summary
ABA inhibited slow-growing maize roots at all tested concentrations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The slow growing roots were all inhibited by exogenous IAA and ABA at any concentrations used”
t0“two-day-old intact maize (cv LG 11) roots”
Claim · model-written summary
Low IAA concentrations promoted fast-growing root elongation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for the fast growing roots their elongation was promoted by these two hormones at low concentrations”
t0“two-day-old intact maize (cv LG 11) roots”
Claim · model-written summary
Low ABA concentrations promoted fast-growing root elongation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for the fast growing roots their elongation was promoted by these two hormones at low concentrations”
t0“two-day-old intact maize (cv LG 11) roots”
Claim · model-written summary
Root growth correlated negatively with endogenous IAA.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A negative correlation between the growth and the endogenous content of these two hormones was obtained.”
t0“two-day-old intact maize (cv LG 11) roots”
Claim · model-written summary
Endogenous ABA levels varied more widely than IAA levels.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA presented a larger range of endogenous level than IAA on the whole population of roots tested.”
t0“two-day-old intact maize (cv LG 11) roots”
Claim · model-written summary
At equal concentrations, IAA affected root elongation more strongly than ABA.
- Treatment
- IAAe0
- Outcome
- root elongatione0
- Direction
- more powerfule0
- Qualifier
- identical concentrationse0
- Comparator
- ABAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for identical concentrations, IAA has a more powerful effect on root elongation than ABA”
t0“two-day-old intact maize (cv LG 11) roots”
The same questions in other papers
class · growth · Zea mays (maize)Positive and negative results
52 papers in the same direction as this paper · 15 in the opposite direction
- negative
- negative
- no effect
64 papers more in this group
See all 68 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.