Abstract
Root and shoot growth of peach seedlings was strongly suppressed when the roots were held at 8 to 10C. Shoot and root dry weights and root volume increased linearly with increasing root-zone temperature (RZT) to 22C. GA 3 at 5.7 μ m (2 ppm) added to the aerated full nutrient solution reversed the effect of low RZT on shoot elongation but inhibited root growth at all RZTs. Paclobutrazol (PBZ) (6.8 × 10 -3 μ m ) (2 ppb) inhibited shoot elongation at all RZTs and shoot dry weight at 16 and 22C. However, PBZ had no effect on root dry weight accumulation at any RZT. The shoot growth-promoting effect of GA 3 , relative to control plants, disappeared at higher RZTs, but GA 3 reversed the growth-inhibiting effect of PBZ at all RZTs. PBZ increased mean root diameter at all RZTs and significantly increased root volume at 22C. These results show that growth of peach seedlings is profoundly influenced by a cool root-zone environment. The plant growth regulator effects suggest that seedling roots play an important role in whole-plant gibberellin physiology. Some possible implications for fruit production are discussed. Chemical names used: gibberellic acid (GA 3 ); β -[(4-chlorophenyl)methyl]- α -(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol(paclobutrazol,PBZ).
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Claims 12
Claim · model-written summary
Cool roots suppressed peach root and shoot growth.
- Taxon
- Peach
Prunus persicat0 - Treatment
- 8 to 10Ce0
- Outcome
- Root and shoot growthe0
- Direction
- strongly suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root and shoot growth of peach seedlings was strongly suppressed when the roots were held at 8 to 10C.”
t0“Peach Seedlings”
Claim · model-written summary
Increasing root-zone temperature to 22C linearly raised shoot and root dry weights and root volume.
- Taxon
- PeachPrunus persicat0
- Treatment
- increasing root-zone temperature (RZT) to 22Ce0
- Outcome
- Shoot and root dry weights and root volumee0
- Direction
- increased linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot and root dry weights and root volume increased linearly with increasing root-zone temperature (RZT) to 22C.”
t0“Peach Seedlings”
Claim · model-written summary
GA 3 reversed low-temperature suppression of shoot elongation.
- Taxon
- PeachPrunus persicat0
- Treatment
- GA 3 at 5.7 μ m (2 ppm)e0
- Outcome
- shoot elongatione0
- Direction
- reversede0
- Comparator
- low RZTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 at 5.7 μ m (2 ppm) added to the aerated full nutrient solution reversed the effect of low RZT on shoot elongation”
t0“Peach Seedlings”
Claim · model-written summary
GA 3 inhibited root growth at all root-zone temperatures.
- Taxon
- PeachPrunus persicat0
- Treatment
- GA 3 at 5.7 μ m (2 ppm)e0
- Outcome
- root growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 at 5.7 μ m (2 ppm) added to the aerated full nutrient solution reversed the effect of low RZT on shoot elongation but inhibited root growth at all RZTs.”
t0“Peach Seedlings”
Claim · model-written summary
PBZ inhibited shoot elongation at all root-zone temperatures.
- Taxon
- PeachPrunus persicat0
- Treatment
- Paclobutrazol (PBZ) (6.8 × 10 -3 μ m ) (2 ppb)e0
- Outcome
- shoot elongatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paclobutrazol (PBZ) (6.8 × 10 -3 μ m ) (2 ppb) inhibited shoot elongation at all RZTs”
t0“Peach Seedlings”
Claim · model-written summary
PBZ inhibited shoot dry weight at 16 and 22C.
- Taxon
- PeachPrunus persicat0
- Treatment
- Paclobutrazol (PBZ) (6.8 × 10 -3 μ m ) (2 ppb)e0
- Outcome
- shoot dry weighte0
- Direction
- inhibitede0
- Qualifier
- 16 and 22Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paclobutrazol (PBZ) (6.8 × 10 -3 μ m ) (2 ppb) inhibited shoot elongation at all RZTs and shoot dry weight at 16 and 22C.”
t0“Peach Seedlings”
Claim · model-written summary
PBZ did not affect root dry weight accumulation.
- Taxon
- PeachPrunus persicat0
- Treatment
- PBZe0
- Outcome
- root dry weight accumulatione0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBZ had no effect on root dry weight accumulation at any RZT.”
t0“Peach Seedlings”
Claim · model-written summary
The shoot growth benefit of GA 3 relative to controls disappeared at higher temperatures.
- Taxon
- PeachPrunus persicat0
- Treatment
- GA 3e0
- Outcome
- shoot growth-promoting effecte0
- Direction
- disappearede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shoot growth-promoting effect of GA 3 , relative to control plants, disappeared at higher RZTs”
t0“Peach Seedlings”
Claim · model-written summary
GA 3 reversed PBZ inhibition at all root-zone temperatures.
- Taxon
- PeachPrunus persicat0
- Treatment
- GA 3e0
- Outcome
- growth-inhibiting effecte0
- Direction
- reversede0
- Comparator
- PBZe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 reversed the growth-inhibiting effect of PBZ at all RZTs.”
t0“Peach Seedlings”
Claim · model-written summary
PBZ increased mean root diameter at all root-zone temperatures.
- Taxon
- PeachPrunus persicat0
- Treatment
- PBZe0
- Outcome
- mean root diametere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBZ increased mean root diameter at all RZTs”
t0“Peach Seedlings”
Claim · model-written summary
PBZ significantly increased root volume at 22C.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBZ increased mean root diameter at all RZTs and significantly increased root volume at 22C.”
t0“Peach Seedlings”
Claim · model-written summary
Seedling roots may play an important role in gibberellin physiology.
- Taxon
- PeachPrunus persicat0
- Organ / stage
- seedling rootse0
- Outcome
- whole-plant gibberellin physiologye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling roots play an important role in whole-plant gibberellin physiology”
t0“Peach Seedlings”
The same questions in other papers
paclobutrazol · growth · Prunus persica (peach)Results differ
10 papers in the same direction as this paper · 10 in the opposite direction
- negative
- negative
- negative
17 papers more in this group
See all 21 papers →Gibberellic acid · growth · Prunus persica (peach)Results differ
18 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
19 papers more in this group
See all 23 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.