Abstract
The effect of Ca on the polar movement of [3H]indoleacetic acid ([3H]IAA) in gravistimulated roots was examined using 3-day-old seedlings of maize (Zea mays L.). Transport of label was measured by placing an agar donor block containing [3H]IAA on one side of the elongation zone and measuring movement of label across the root into an agar receiver block on the opposite side. In vertically oriented roots, movement of label across the elongation zone into the receiver was slight and was not enhanced by incorporating 10 millimolar CaCl2 into the receiver block. In horizontally oriented roots, movement of label across the root was readily detectable and movement to a receiver on the bottom was about 3-fold greater than movement in the opposite direction. This polarity was abolished in roots from which the caps were removed prior to gravistimulation. When CaCl2 was incorporated into the receivers, movement of label across horizontally oriented intact roots was increased about 3-fold in both the downward and upward direction. The ability of Ca to enhance the movement of label from [3H]IAA increased with increasing Ca concentration in the receiver up to 5 to 10 millimolar CaCl2. With the inclusion of CaCl2 in the receiver blocks, gravity-induced polar movement of label into receiver blocks from applied [3H]IAA was detectable within 30 minutes, and asymmetric distribution of label within the tissue was detectable within 20 minutes. The results indicate that gravistimulation induces a physiological asymmetry in the auxin transport system of maize roots and that Ca increases the total transport of auxin across the root.
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Claims 12
Claim · model-written summary
Vertically oriented maize roots showed slight label movement across the elongation zone.
- Organ / stage
- rootse0
- Outcome
- movement of label across the elongation zone into the receivere0
- Direction
- slighte0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“In vertically oriented roots, movement of label across the elongation zone into the receiver was slight”
Claim · model-written summary
Adding 10 millimolar CaCl2 did not enhance label movement in vertical roots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“was not enhanced by incorporating 10 millimolar CaCl2 into the receiver block.”
e1“In vertically oriented roots, movement of label across the elongation zone into the receiver was slight”
Claim · model-written summary
Horizontal roots showed detectable movement of auxin label across the root.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“In horizontally oriented roots, movement of label across the root was readily detectable”
Claim · model-written summary
In horizontal roots, downward label movement was about 3-fold greater than upward movement.
- Outcome
- movement to a receiver on the bottome0
- Direction
- greatere0
- Value
- 3-folde0
- Comparator
- movement in the opposite directione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“movement to a receiver on the bottom was about 3-fold greater than movement in the opposite direction.”
Claim · model-written summary
Removing root caps abolished the polarity of auxin label transport.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“This polarity was abolished in roots from which the caps were removed prior to gravistimulation.”
Claim · model-written summary
Calcium increased downward label movement about 3-fold in intact horizontal roots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“When CaCl2 was incorporated into the receivers, movement of label across horizontally oriented intact roots was increased about 3-fold in both the downward and upward direction.”
Claim · model-written summary
Calcium increased upward label movement about 3-fold in intact horizontal roots.
- Treatment
- CaCl2e0
- Outcome
- movement of labele0
- Direction
- increasede0
- Value
- 3-folde0
- Qualifier
- upward directione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“When CaCl2 was incorporated into the receivers, movement of label across horizontally oriented intact roots was increased about 3-fold in both the downward and upward direction.”
Claim · model-written summary
Calcium enhancement of label movement rose with concentration up to 5 to 10 millimolar CaCl2.
- Treatment
- Cae0
- Outcome
- movement of label from [3H]IAAe0
- Direction
- increasede0
- Value
- 5 to 10 millimolar CaCl2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“The ability of Ca to enhance the movement of label from [3H]IAA increased with increasing Ca concentration in the receiver up to 5 to 10 millimolar CaCl2.”
Claim · model-written summary
With calcium present, gravity-induced polar label movement became detectable within 30 minutes.
- Treatment
- CaCl2e0
- Outcome
- gravity-induced polar movement of label into receiver blockse0
- Value
- 30 minutese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“With the inclusion of CaCl2 in the receiver blocks, gravity-induced polar movement of label into receiver blocks from applied [3H]IAA was detectable within 30 minutes”
Claim · model-written summary
With calcium present, asymmetric label distribution in root tissue became detectable within 20 minutes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“asymmetric distribution of label within the tissue was detectable within 20 minutes.”
Claim · model-written summary
The authors infer that gravistimulation induces physiological asymmetry in the maize root auxin transport system.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gravistimulation induces a physiological asymmetry in the auxin transport system of maize roots”
Claim · model-written summary
The authors infer that calcium increases total auxin transport across the maize root.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca increases the total transport of auxin across the root.”
t0“Maize”
The same questions in other papers
calcium chloride dihydrate · molecular: metabolites · Zea mays (maize)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- 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.