Abstract
Previous work showed that accumulation of endogenous abscisic acid (ABA) acts both to maintain primary root growth and inhibit shoot growth in maize seedlings at low water potentials (psi(w)) (IN Saab, RE Sharp, J Pritchard, GS Voetberg [1990] Plant Physiol 93: 1329-1336). In this study, we have characterized the growth responses of the primary root and mesocotyl of maize (Zea mays L. cv FR27 x FRMo 17) to manipulation of ABA levels at low psi(w) with a high degree of spatial resolution to provide the basis for studies of the mechanism(s) of ABA action. In seedlings growing at low psi(w) and treated with fluridone to inhibit carotenoid (and ABA) biosynthesis, ABA levels were decreased in all locations of the root and mesocotyl growing zones compared with untreated seedlings growing at the same psi(w). In the root, low psi(w) (-1.6 megapascals) caused a shortening of the growing zone, as reported previously. The fluridone treatment was associated with severe inhibition of root elongation rate, which resulted from further shortening of the growing zone. In the mesocotyl, low psi(w) (-0.3 megapascal) also resulted in a shortened growing zone. In contrast with the primary root, however, fluridone treatment prevented most of the inhibition of elongation and the shortening of the growing zone. Final cell length measurements indicated that the responses of both root and mesocotyl elongation to ABA manipulation at low psi(w) involve large effects on cell expansion. Measurements of the relative changes in root and shoot water contents and dry weights after transplanting to a psi(w) of -0.3 megapascal showed that the maintenance of shoot elongation in fluridone-treated seedlings was not attributable to increased water or seed-reserve availability resulting from inhibition of root growth. The results suggest a developmental gradient in tissue responsiveness to endogenous ABA in both the root and mesocotyl growing zones. In the root, the capacity for ABA to protect cell expansion at low psi(w) appears to decrease with increasing distance from the apex. In the mesocotyl, in contrast, the accumulation of ABA at low psi(w) appears to become increasingly inhibitory to expansion as cells are displaced away from the meristematic region.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Fluridone treatment decreased ABA levels in the root and mesocotyl growing zones of seedlings at low water potential, relative to untreated seedlings at the same water potential.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- root and mesocotyl growing zonese1
- Treatment
- fluridonee1
- Outcome
- ABA levelse1
- Direction
- decreasede1
- Qualifier
- low psi(w)e1
- Comparator
- untreated seedlingse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e1“In seedlings growing at low psi(w) and treated with fluridone to inhibit carotenoid (and ABA) biosynthesis, ABA levels were decreased in all locations of the root and mesocotyl growing zones compared with untreated seedlings growing at the same psi(w)”
Claim · model-written summary
Low water potential (-1.6 megapascals) shortened the growing zone of the maize primary root.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- roote2
- Treatment
- low psi(w) (-1.6 megapascals)e2
- Outcome
- growing zonee2
- Direction
- shorteninge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e2“In the root, low psi(w) (-1.6 megapascals) caused a shortening of the growing zone, as reported previously”
Claim · model-written summary
Fluridone treatment severely inhibited the root elongation rate of maize at low water potential.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- roote3
- Treatment
- fluridone treatmente3
- Outcome
- root elongation ratee3
- Direction
- severe inhibitione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e3“The fluridone treatment was associated with severe inhibition of root elongation rate, which resulted from further shortening of the growing zone”
Claim · model-written summary
Low water potential (-0.3 megapascal) shortened the growing zone of the maize mesocotyl.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- mesocotyle4
- Treatment
- low psi(w) (-0.3 megapascal)e4
- Outcome
- growing zonee4
- Direction
- shortenede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e4“In the mesocotyl, low psi(w) (-0.3 megapascal) also resulted in a shortened growing zone”
Claim · model-written summary
Fluridone treatment prevented most of the inhibition of mesocotyl elongation at low water potential.
- Material
- FR27 x FRMo 17e0
- Treatment
- fluridone treatmente5
- Outcome
- inhibition of elongatione5
- Direction
- preventede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e5“In contrast with the primary root, however, fluridone treatment prevented most of the inhibition of elongation and the shortening of the growing zone”
Claim · model-written summary
Responses of root and mesocotyl elongation to ABA manipulation at low water potential involve large effects on cell expansion.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- root and mesocotyle6
- Treatment
- ABA manipulation at low psi(w)e6
- Outcome
- cell expansione6
- Qualifier
- large effectse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e6“Final cell length measurements indicated that the responses of both root and mesocotyl elongation to ABA manipulation at low psi(w) involve large effects on cell expansion”
Claim · model-written summary
Maintenance of shoot elongation in fluridone-treated seedlings was not attributable to increased water or seed-reserve availability.
- Material
- FR27 x FRMo 17e0
- Treatment
- fluridonee7
- Outcome
- maintenance of shoot elongatione7
- Qualifier
- not attributable to increased water or seed-reserve availabilitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e7“Measurements of the relative changes in root and shoot water contents and dry weights after transplanting to a psi(w) of -0.3 megapascal showed that the maintenance of shoot elongation in fluridone-treated seedlings was not attributable to increased water or seed-reserve availability resulting from inhibition of root growth”
Claim · model-written summary
Root and mesocotyl growing zones show a developmental gradient in tissue responsiveness to endogenous ABA.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- root and mesocotyl growing zonese1
- Compound
- endogenous ABAe1
- Outcome
- tissue responsiveness to endogenous ABAe1
- Qualifier
- developmental gradiente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e1“The results suggest a developmental gradient in tissue responsiveness to endogenous ABA in both the root and mesocotyl growing zones”
Claim · model-written summary
The capacity of ABA to protect cell expansion at low water potential appears to decrease with increasing distance from the root apex.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- roote1
- Outcome
- capacity for ABA to protect cell expansione1
- Direction
- decreasee1
- Qualifier
- with increasing distance from the apexe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e1“In the root, the capacity for ABA to protect cell expansion at low psi(w) appears to decrease with increasing distance from the apex”
Claim · model-written summary
In the mesocotyl, ABA accumulation at low water potential appears to become increasingly inhibitory to expansion with distance from the meristem.
- Material
- FR27 x FRMo 17e0
- Organ / stage
- mesocotyle1
- Compound
- ABAe1
- Outcome
- expansione1
- Direction
- increasingly inhibitorye1
- Qualifier
- as cells are displaced away from the meristematic regione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize (Zea mays L. cv FR27 x FRMo 17)”
e1“In the mesocotyl, in contrast, the accumulation of ABA at low psi(w) appears to become increasingly inhibitory to expansion as cells are displaced away from the meristematic region”
The same questions in other papers
Fluridone · growth · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 papers →Fluridone · disease · Zea mays (maize)Results agree
1 paper in the same direction as this paper
- 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.