Abstract
Plants raised from shoot-tip cultures of apple (Malus x domestica Borkh ) were grown in divided pots so that approximately half the root system could be exposed to soil drying whilst the remainder was well watered. Water was withheld from half the root system in this way for 24 d. During this time, the daily increment in leaf area declined to 65% of that of control plants, which had all their roots in well watered soil Both leaf expansion and, more particularly, leaf initiation were inhibited. Water loss per plant also fell to 70%% of the rate exhibited by control plants. No significant differences were detected between the leaf water status of the partially dried plants and that of the well watered ones After this drying period, the half-dried plants were treated during the night of the 24th day as follows; one group had its roots in dry soil rewatered, another had them excised, and a third continued half dry Both the rewatered group and the group with roots excised showed significant recoveries in leaf growth rates compared with the group kept half dry. The inhibition of leaf growth by drying soil is discussed with regard to root-to-shoot signalling The alleviation of this inhibition by the excision of roots in dry soil, is taken as evidence of a positive inhibitor, produced by drying roots, influencing shoot growth.
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Claims 7
Claim · model-written summary
Partial root drying reduced daily leaf-area increment to 65% of control plants.
- Taxon
- apple
Malus domesticat0 - Treatment
- Soil Dryingt0
- Outcome
- daily increment in leaf areae0
- Direction
- declinede0
- Value
- 65%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the daily increment in leaf area declined to 65% of that of control plants”
t0“Soil Drying in Apple”
Claim · model-written summary
Partial root drying inhibited leaf expansion and especially leaf initiation.
- Taxon
- appleMalus domesticat0
- Treatment
- Soil Dryingt0
- Outcome
- leaf expansion and, more particularly, leaf initiatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both leaf expansion and, more particularly, leaf initiation were inhibited.”
t0“Soil Drying in Apple”
Claim · model-written summary
Water loss per plant fell to 70% of the control rate.
- Taxon
- appleMalus domesticat0
- Treatment
- Soil Dryingt0
- Outcome
- Water loss per plante0
- Direction
- felle0
- Value
- 70%%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water loss per plant also fell to 70%% of the rate exhibited by control plants.”
t0“Soil Drying in Apple”
Claim · model-written summary
Leaf water status did not significantly differ between partially dried and watered plants.
- Taxon
- appleMalus domesticat0
- Treatment
- partially dried plantse0
- Outcome
- leaf water statuse0
- Direction
- No significant differencese0
- Comparator
- well watered onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant differences were detected between the leaf water status of the partially dried plants and that of the well watered ones”
t0“apple”
Claim · model-written summary
Rewatering dry roots significantly recovered leaf growth relative to continued half drying.
- Taxon
- appleMalus domesticat0
- Treatment
- rewatered groupe0
- Outcome
- leaf growth ratese0
- Direction
- recoveriese0
- Comparator
- group kept half drye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the rewatered group and the group with roots excised showed significant recoveries in leaf growth rates compared with the group kept half dry.”
t0“apple”
Claim · model-written summary
Excising dry roots significantly recovered leaf growth relative to continued half drying.
- Taxon
- appleMalus domesticat0
- Treatment
- group with roots excisede0
- Outcome
- leaf growth ratese0
- Direction
- recoveriese0
- Comparator
- group kept half drye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the rewatered group and the group with roots excised showed significant recoveries in leaf growth rates compared with the group kept half dry.”
t0“apple”
Claim · model-written summary
The authors interpret recovery after root excision as evidence of a root-produced inhibitor of shoot growth.
- Taxon
- appleMalus domesticat0
- Outcome
- shoot growthe0
- Qualifier
- a positive inhibitor, produced by drying rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The alleviation of this inhibition by the excision of roots in dry soil, is taken as evidence of a positive inhibitor, produced by drying roots, influencing shoot growth.”
t0“apple”
The same questions in other papers
processing · growth · Malus domestica (apple)Positive and negative results
6 papers in the same direction as this paper · 13 in the opposite direction
- negative
- no effect
- positive
16 papers more in this group
See all 20 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.