Abstract
The role of auxins on root system architecture was studied by applying indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), and 1-naphthaleneacetic acid (NAA) to maize roots and analysing the main processes involved in root development: primary root (PR) elongation, lateral root (LR) formation, and LR root elongation. We found that these effects were not dependent only on concentration, but also on the type of auxin applied. We also studied temporal changes in auxin inhibition of PR elongation. These temporal changes were analysed calculating the elongation ratio between two consecutive one day periods after auxin application. It was observed that a reduction in root elongation was also dependent on the type of auxin applied and its concentration. The inhibitory effect of IBA and IAA decreased on the second day, and the ratio also increased with the concentration. In contrast, NAA increased root elongation inhibition with time. Indeed, the ratio decreased as the NAA concentration increased. Regarding LR formation, we observed that external auxin increased only LR formation in certain zones of the PR. Finally, comparison of inhibition elongation associated with auxin in the LR and PR clearly demonstrates that PR elongation was more sensitive to auxin than LR elongation.
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Claims 9
Claim · model-written summary
Root elongation reduction depended on auxin type and concentration.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduction in root elongation was also dependent on the type of auxin applied and its concentration”
t0“maize seedlings”
Claim · model-written summary
IBA inhibition of primary root elongation decreased on the second day.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effect of IBA and IAA decreased on the second day”
e1“auxin inhibition of PR elongation”
t0“maize seedlings”
Claim · model-written summary
IAA inhibition of primary root elongation decreased on the second day.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effect of IBA and IAA decreased on the second day”
e1“auxin inhibition of PR elongation”
t0“maize seedlings”
Claim · model-written summary
The elongation ratio increased with IBA concentration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effect of IBA and IAA decreased on the second day, and the ratio also increased with the concentration”
t0“maize seedlings”
Claim · model-written summary
The elongation ratio increased with IAA concentration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effect of IBA and IAA decreased on the second day, and the ratio also increased with the concentration”
t0“maize seedlings”
Claim · model-written summary
NAA increased root elongation inhibition with time.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NAA increased root elongation inhibition with time”
t0“maize seedlings”
Claim · model-written summary
The elongation ratio decreased as NAA concentration increased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio decreased as the NAA concentration increased”
t0“maize seedlings”
Claim · model-written summary
External auxin increased lateral root formation only in certain primary root zones.
- Treatment
- external auxine0
- Outcome
- LR formatione0
- Direction
- increasede0
- Qualifier
- certain zones of the PRe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“external auxin increased only LR formation in certain zones of the PR”
t0“maize seedlings”
Claim · model-written summary
Primary root elongation was more sensitive to auxin than lateral root elongation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PR elongation was more sensitive to auxin than LR elongation”
t0“maize seedlings”
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