Abstract
Maize seeds were germinated in the dark in the presence of the carotenoid synthesis inhibitor norflurazon and the levels of abscisic acid, xanthoxin and total carotenoids were measured in the root cap and in the adjacent 1.5 mm segment. In norflurazon-treated roots abscisic acid levels were markedly reduced, but an increase occurred in the levels of xanthoxin, a compound structurally and physiologically similar to abscisic acid. In the cultivar of maize (Zea mays L. cv. Merit) used for this work, brief illumination of the root is required for gravitropic curving. Following illumination both control and norflurazon-treated roots showed normal gravitropic curvature; however, the rate of curvature was delayed in norflurazon-treated roots. Our data from norflurazon-treated roots are consistent with a role for xanthoxin in maize root gravitropism. The increase in xanthoxin in the presence of an inhibitor of carotenoid synthesis suggests that xanthoxin and abscisic acid originate, at least in part, via different metabolic pathways.
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Claims 6
Claim · model-written summary
Norflurazon markedly reduced root abscisic acid levels.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In norflurazon-treated roots abscisic acid levels were markedly reduced”
t0“maize roots”
Claim · model-written summary
Norflurazon increased root xanthoxin levels.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase occurred in the levels of xanthoxin”
t0“norflurazon, an inhibitor of carotenogenesis, on abscisic acid and xanthoxin in the caps of gravistimulated maize roots”
Claim · model-written summary
Both treated and control roots had normal gravitropic curvature after illumination.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following illumination both control and norflurazon-treated roots showed normal gravitropic curvature”
t0“maize roots”
Claim · model-written summary
Norflurazon delayed the rate of root curvature.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of curvature was delayed in norflurazon-treated roots”
t0“maize roots”
Claim · model-written summary
The authors infer xanthoxin has a role in maize root gravitropism.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“consistent with a role for xanthoxin in maize root gravitropism”
Claim · model-written summary
The authors infer xanthoxin and abscisic acid partly arise through different metabolic pathways.
- Compound
- xanthoxin and abscisic acide0
- Outcome
- different metabolic pathwayse0
- Qualifier
- at least in parte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“xanthoxin and abscisic acid originate, at least in part, via different metabolic pathways”
t0“maize roots”