Abstract
The aim of the present work was to determine the factors limiting growth in mechanically impeded roots. Pea roots were grown in compressed and uncompressed sand cores, and then removed and transferred to hydroponics. Root elongation was slowed in impeded sand cores and did not recover to the unimpeded rates until 60 h after transfer to the hydroponics system. Root diameter was greater in impeded roots, and only after 36 h in hydroponics was new root tissue produced of the same diameter as the unimpeded controls. The turgor pressure of the growing cells was measured with a turgor probe and was the same in both treatments. The slower elongation rate of the previously impeded roots was, therefore, the result of axial tightening of the cell walls. Cell length profiles suggested that axial cell wall tightening persisted in the unrestricted hydroponics system. Production of new cells in unrestricted conditions was required before root elongation returned to the unimpeded state. Osmotic potential was decreased by approximately 0.2 MPa in previously impeded roots compared with the unimpeded ones. This corresponds to a decrease in water potential of 0.2 MPa. These data are discussed in relation to regulation of cell extension, solute unloading and the penetration of compacted soils by roots.
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Claims 8
Claim · model-written summary
Pea root elongation slowed in impeded sand and recovered only 60 h after transfer to hydroponics.
- Taxon
- Pea
Lathyrus oleraceust0 - Treatment
- impeded sand corese0
- Outcome
- Root elongatione0
- Direction
- slowede0
- Value
- 60 he0
- Comparator
- unimpeded ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root elongation was slowed in impeded sand cores and did not recover to the unimpeded rates until 60 h after transfer to the hydroponics system”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
Claim · model-written summary
Impeded pea roots had greater diameter, with new tissue matching controls after 36 h in hydroponics.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- impeded rootse0
- Outcome
- Root diametere0
- Direction
- greatere0
- Value
- 36 he0
- Comparator
- unimpeded controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root diameter was greater in impeded roots, and only after 36 h in hydroponics was new root tissue produced of the same diameter as the unimpeded controls”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
Claim · model-written summary
Growing-cell turgor pressure was the same in both pea root treatments.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- both treatmentse0
- Outcome
- turgor pressure of the growing cellse0
- Direction
- the samee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The turgor pressure of the growing cells was measured with a turgor probe and was the same in both treatments”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
Claim · model-written summary
Axial cell wall tightening explained slower elongation in previously impeded pea roots.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- slower elongation ratee0
- Qualifier
- axial tightening of the cell wallse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The slower elongation rate of the previously impeded roots was, therefore, the result of axial tightening of the cell walls”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
Claim · model-written summary
Cell length profiles suggested that axial cell wall tightening persisted after transfer to hydroponics.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- axial cell wall tightening persistede0
- Setting
- unrestricted hydroponics systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cell length profiles suggested that axial cell wall tightening persisted in the unrestricted hydroponics system”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
Claim · model-written summary
New cell production under unrestricted conditions preceded recovery of pea root elongation.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- root elongation returned to the unimpeded statee0
- Qualifier
- Production of new cells in unrestricted conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Production of new cells in unrestricted conditions was required before root elongation returned to the unimpeded state”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
Claim · model-written summary
Previously impeded pea roots had osmotic potential about 0.2 MPa lower than unimpeded roots.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- previously impeded rootse0
- Outcome
- Osmotic potentiale0
- Direction
- decreasede0
- Value
- 0.2 MPae0
- Comparator
- unimpeded onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic potential was decreased by approximately 0.2 MPa in previously impeded roots compared with the unimpeded ones”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
Claim · model-written summary
Previously impeded pea roots had water potential 0.2 MPa lower.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- impedede1
- Outcome
- water potentiale0
- Direction
- decreasee0
- Value
- 0.2 MPae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This corresponds to a decrease in water potential of 0.2 MPa”
t0“pea (Pisum sativum)”
t1“pea (Pisum sativum)”
e1“Root elongation was slowed in impeded sand cores and did not recover to the unimpeded rates until 60 h after transfer to the hydroponics system”
The same questions in other papers
growing medium · growth · Lathyrus oleraceus (pea)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
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See all 5 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.