Abstract
Rooting volume restriction (RVR) reduces shoot growth of plants provided with sufficient water or nutrients. The effects of RVR on water status, abscisic acid (ABA) levels in leaves, roots, or xylem sap from detopped plants of watermelon [Citrullus lanatus (Thunb.) Matsum. and Nakai ‘StarBrite’] seedlings were evaluated with five rooting volumes (18, 26, 36, 46, or 80 cm3). Shoot water potential increased with increasing rooting volume, with no difference between plants from 18 and 26 cm3 cells or between plants from 36 and 46 cm3 cells. Stomatal conductance was not consistently affected by RVR; at 10 and 20 DAE, stomatal conductance in plants grown in 36 cm3 cells was higher than that of plants grown in any other cell volume. Severe RVR (18 and/or 26 cm3) tended to produce plants with higher ABA levels in roots (15 DAE only), xylem sap (all dates), and leaves (5 and 10 DAE). Plants grown in 18 and 26 cm3 cells had higher root ABA levels than those from 46 and 80 cm3 cells at 15 DAE. Plants grown in 18 cm3 cells had the highest xylem sap ABA level at all dates, but ABA levels did not differ among plants grown in the other cell volumes. Plants grown in 18 cm3 cells at 5 DAE and 18 and 26 cm3 cells at 10 DAE also had higher leaf ABA levels than those from other rooting volumes. The results suggest that ABA may act as a signal for reduced growth of plants under RVR conditions.
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Claims 9
Claim · model-written summary
Shoot water potential increased with rooting volume.
- Taxon
- watermelon
Citrullus lanatust0 - Treatment
- rooting volumee0
- Outcome
- Shoot water potentiale0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“Shoot water potential increased with increasing rooting volume”
Claim · model-written summary
Shoot water potential did not differ between 18 and 26 cm3 cells or between 36 and 46 cm3 cells.
- Taxon
- watermelonCitrullus lanatust0
- Outcome
- water potentiale1
- Direction
- no differencee0
- Qualifier
- 18 and 26 cm3 cells or between plants from 36 and 46 cm3 cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“with no difference between plants from 18 and 26 cm3 cells or between plants from 36 and 46 cm3 cells”
e1“Shoot water potential increased with increasing rooting volume”
Claim · model-written summary
Stomatal conductance was not consistently affected by rooting volume restriction.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- RVRe0
- Outcome
- Stomatal conductancee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“Stomatal conductance was not consistently affected by RVR”
Claim · model-written summary
At 10 and 20 DAE, conductance in 36 cm3 cells exceeded that in other volumes.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- 36 cm3 cellse0
- Outcome
- stomatal conductancee0
- Direction
- highere0
- Qualifier
- 10 and 20 DAEe0
- Comparator
- any other cell volumee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“at 10 and 20 DAE, stomatal conductance in plants grown in 36 cm3 cells was higher than that of plants grown in any other cell volume”
Claim · model-written summary
At 15 DAE, root ABA was higher in 18 and 26 cm3 cells than 46 and 80 cm3 cells.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- 18 and 26 cm3 cellse0
- Outcome
- root ABA levelse0
- Direction
- highere0
- Qualifier
- 15 DAEe0
- Comparator
- 46 and 80 cm3 cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“Plants grown in 18 and 26 cm3 cells had higher root ABA levels than those from 46 and 80 cm3 cells at 15 DAE”
Claim · model-written summary
Xylem sap ABA was highest in 18 cm3 cells at all dates.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- 18 cm3 cellse0
- Outcome
- xylem sap ABA levele0
- Direction
- higheste0
- Qualifier
- all datese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“Plants grown in 18 cm3 cells had the highest xylem sap ABA level at all dates”
Claim · model-written summary
Xylem sap ABA did not differ among other cell volumes.
- Taxon
- watermelonCitrullus lanatust0
- Outcome
- ABA levelse0
- Direction
- did not differe0
- Qualifier
- other cell volumese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“ABA levels did not differ among plants grown in the other cell volumes”
Claim · model-written summary
Leaf ABA was higher in 18 cm3 cells at 5 DAE.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- 18 cm3 cellse0
- Outcome
- leaf ABA levelse0
- Direction
- highere0
- Qualifier
- 5 DAEe0
- Comparator
- other rooting volumese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“Plants grown in 18 cm3 cells at 5 DAE and 18 and 26 cm3 cells at 10 DAE also had higher leaf ABA levels than those from other rooting volumes”
Claim · model-written summary
Leaf ABA was higher in 18 and 26 cm3 cells at 10 DAE.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- 18 and 26 cm3 cellse0
- Outcome
- leaf ABA levelse0
- Direction
- highere0
- Qualifier
- 10 DAEe0
- Comparator
- other rooting volumese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“watermelon”
e0“Plants grown in 18 cm3 cells at 5 DAE and 18 and 26 cm3 cells at 10 DAE also had higher leaf ABA levels than those from other rooting volumes”