Abstract
Lateral root development in Arabidopsis provides a model for the study of hormonal signals that regulate postembryonic organogenesis in higher plants. Lateral roots originate from pairs of pericycle cells, in several cell files positioned opposite the xylem pole, that initiate a series of asymmetric, transverse divisions. The auxin transport inhibitor N-1-naphthylphthalamic acid (NPA) arrests lateral root development by blocking the first transverse division(s). We investigated the basis of NPA action by using a cell-specific reporter to demonstrate that xylem pole pericycle cells retain their identity in the presence of the auxin transport inhibitor. However, NPA causes indoleacetic acid (IAA) to accumulate in the root apex while reducing levels in basal tissues critical for lateral root initiation. This pattern of IAA redistribution is consistent with NPA blocking basipetal IAA movement from the root tip. Characterization of lateral root development in the shoot meristemless1 mutant demonstrates that root basipetal and leaf acropetal auxin transport activities are required during the initiation and emergence phases, respectively, of lateral root development.
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Claims 7
Claim · model-written summary
Lateral roots originate from xylem pole pericycle cell pairs that divide asymmetrically.
- Taxon
- Arabidopsis
Arabidopsist0 - Organ / stage
- Lateral rootse0
- Outcome
- originate from pairs of pericycle cells, in several cell files positioned opposite the xylem pole, that initiate a series of asymmetric, transverse divisionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lateral roots originate from pairs of pericycle cells, in several cell files positioned opposite the xylem pole, that initiate a series of asymmetric, transverse divisions.”
t0“Arabidopsis”
Claim · model-written summary
NPA arrests lateral root development by blocking the first transverse divisions.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- N-1-naphthylphthalamic acid (NPA)e0
- Outcome
- lateral root developmente0
- Direction
- arrestse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The auxin transport inhibitor N-1-naphthylphthalamic acid (NPA) arrests lateral root development by blocking the first transverse division(s).”
t0“Arabidopsis”
Claim · model-written summary
Xylem pole pericycle cells retain their identity under auxin transport inhibition.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- xylem pole pericycle cellse0
- Treatment
- auxin transport inhibitore0
- Outcome
- retain their identitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“xylem pole pericycle cells retain their identity in the presence of the auxin transport inhibitor.”
t0“Arabidopsis”
Claim · model-written summary
NPA causes IAA accumulation in the root apex.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- root apexe0
- Treatment
- NPAe0
- Outcome
- indoleacetic acid (IAA)e0
- Direction
- accumulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NPA causes indoleacetic acid (IAA) to accumulate in the root apex”
t0“Arabidopsis”
Claim · model-written summary
NPA lowers IAA levels in basal root tissues.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- basal tissuese0
- Treatment
- NPAe0
- Outcome
- levelse0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NPA causes indoleacetic acid (IAA) to accumulate in the root apex while reducing levels in basal tissues critical for lateral root initiation.”
t0“Arabidopsis”
Claim · model-written summary
Root basipetal auxin transport is required for lateral root initiation.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- roote0
- Outcome
- initiatione0
- Qualifier
- root basipetale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root basipetal and leaf acropetal auxin transport activities are required during the initiation and emergence phases, respectively, of lateral root development.”
t0“Arabidopsis”
Claim · model-written summary
Leaf acropetal auxin transport is required for lateral root emergence.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- leafe0
- Outcome
- emergencee0
- Qualifier
- leaf acropetale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root basipetal and leaf acropetal auxin transport activities are required during the initiation and emergence phases, respectively, of lateral root development.”
t0“Arabidopsis”
The same questions in other papers
naptalam · molecular: metabolites · ArabidopsisPositive and negative results
1 in the opposite direction
- no effect
naptalam · growth · ArabidopsisPositive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- positive
3 papers more in this group
See all 7 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.