Abstract
The effect of ABA on root growth, secondary-root formation and root gravitropism in seedlings of Zea mays was investigated by using Fluridone-treated seedlings and a viviparous mutant, both of which lack carotenoids and ABA. Primary roots of seedlings grown in the presence of Fluridone grew significantly slower than those of control (i.e. untreated) roots. Elongation of Fluridone-treated roots was inhibited significantly by the exogenous application of 1 mM ABA. Exogenous application of 1 micromole and 1 nmole ABA had either no effect or only a slight stimulatory effect on root elongation, depending on the method of application. The absence of ABA in Fluridone-treated plants was not an important factor in secondary-root formation in seedlings less than 9-10 d old. However, ABA may suppress secondary-root formation in older seedlings, since 11-d-old control seedlings had significantly fewer secondary roots than Fluridone-treated seedlings. Roots of Fluridone-treated and control seedlings were graviresponsive. Similar data were obtained for vp-9 mutants of Z. mays, which are phenotypically identical to Fluridone-treated seedlings. These results indicate that ABA is necessary for neither secondary-root formation nor for positive gravitropism by primary roots.
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Claims 8
Claim · model-written summary
Fluridone-treated primary roots grew significantly slower than untreated roots.
- Treatment
- Fluridonee0
- Outcome
- Primary rootse0
- Direction
- slowere0
- Comparator
- control (i.e. untreated) rootse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Primary roots of seedlings grown in the presence of Fluridone grew significantly slower than those of control (i.e. untreated) roots”
t0“Zea mays L.”
Claim · model-written summary
1 mM ABA significantly inhibited elongation of Fluridone-treated roots.
- Treatment
- exogenous application of 1 mM ABAe0
- Outcome
- Elongation of Fluridone-treated rootse0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elongation of Fluridone-treated roots was inhibited significantly by the exogenous application of 1 mM ABA”
t0“Zea mays L.”
Claim · model-written summary
Low ABA doses had no or slight stimulatory effect on root elongation, depending on application.
- Treatment
- Exogenous application of 1 micromole and 1 nmole ABAe0
- Outcome
- root elongatione0
- Direction
- no effect or only a slight stimulatory effecte0
- Qualifier
- depending on the method of applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous application of 1 micromole and 1 nmole ABA had either no effect or only a slight stimulatory effect on root elongation, depending on the method of application”
t0“Zea mays L.”
Claim · model-written summary
ABA absence was not important for secondary roots before 9-10 days.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“absence of ABA in Fluridone-treated plants was not an important factor in secondary-root formation in seedlings less than 9-10 d old”
t0“Zea mays L.”
Claim · model-written summary
At day 11 controls had significantly fewer secondary roots than Fluridone-treated seedlings.
- Treatment
- Fluridone-treated seedlingse0
- Outcome
- secondary rootse0
- Direction
- fewere0
- Qualifier
- 11-d-olde0
- Comparator
- control seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“11-d-old control seedlings had significantly fewer secondary roots than Fluridone-treated seedlings”
t0“Zea mays L.”
Claim · model-written summary
Fluridone-treated and control seedling roots responded to gravity.
- Outcome
- graviresponsivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots of Fluridone-treated and control seedlings were graviresponsive”
t0“Zea mays L.”
Claim · model-written summary
vp-9 mutants gave similar results to Fluridone-treated seedlings.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar data were obtained for vp-9 mutants of Z. mays, which are phenotypically identical to Fluridone-treated seedlings”
Claim · model-written summary
ABA may suppress secondary-root formation in older seedlings.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA may suppress secondary-root formation in older seedlings”
t0“Zea mays L.”
The same questions in other papers
(+)-abscisic acid · growth · Zea mays (maize)Results differ
16 papers in the same direction as this paper · 15 in the opposite direction
- negative
- positive
- positive
28 papers more in this group
See all 32 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.