Abstract
Germination of rape (Brassica napus L.) seeds proceeds in two phases, an initial imbibition phase and a subsequent growth phase. The time courses of water uptake, O(2) uptake, and ATP accumulation demonstrate that exogenous abscisic acid (ABA, 0.1 millimoles per liter) specifically prevents the embryo from entering the growth phase. The inhibition of water uptake by ABA is a rapid (lag-phase about 1 hour) and fully reversible process which appears to be the cause rather than the result of changes of the energy metabolism. In untreated seeds, an osmotic pressure (polyethylene glycol 6000) of 11 bars is required for a simulation of the ABA effect on water uptake. However, in ABA-treated seeds an osmotic pressure of only 3 bars is sufficient to suppress water uptake. Thus, ABA lowers the ability of the embryo to absorb water under osmotic stress. In a two-factor analysis of the simultaneous action of ABA and osmoticum on germination, a complete synergistic interaction between these factors was found while ABA and cycloheximide exhibit independent (multiplicative) coaction. These results are interpreted in terms of a common controlling point of ABA and osmotic stress in the water relations of germinating seeds.
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Claims 10
Claim · model-written summary
Rape seed germination proceeds through imbibition and growth phases.
- Taxon
- Brassica napus L.
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Outcome
- an initial imbibition phase and a subsequent growth phasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Germination of rape (Brassica napus L.) seeds proceeds in two phases, an initial imbibition phase and a subsequent growth phase.”
Claim · model-written summary
Exogenous ABA at 0.1 millimoles per liter prevents embryos entering the growth phase.
- Taxon
- Brassica napus L.Brassica napuse1
- Organ / stage
- embryoe0
- Treatment
- exogenous abscisic acid (ABA, 0.1 millimoles per liter)e0
- Outcome
- entering the growth phasee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous abscisic acid (ABA, 0.1 millimoles per liter) specifically prevents the embryo from entering the growth phase.”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
ABA rapidly and reversibly inhibits water uptake, with a lag of about one hour.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- ABAe0
- Outcome
- water uptakee0
- Direction
- inhibitione0
- Value
- about 1 houre0
- Qualifier
- fully reversiblee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibition of water uptake by ABA is a rapid (lag-phase about 1 hour) and fully reversible process”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
Water uptake inhibition appears to cause changes in energy metabolism.
- Taxon
- Brassica napus L.Brassica napuse1
- Outcome
- changes of the energy metabolisme0
- Qualifier
- inhibition of water uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibition of water uptake by ABA is a rapid (lag-phase about 1 hour) and fully reversible process which appears to be the cause rather than the result of changes of the energy metabolism.”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
Untreated seeds require 11 bars of polyethylene glycol osmotic pressure to simulate ABA inhibition of water uptake.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- an osmotic pressure (polyethylene glycol 6000) of 11 barse0
- Outcome
- water uptakee0
- Direction
- decreaseinferrede0
- Qualifier
- untreated seedse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In untreated seeds, an osmotic pressure (polyethylene glycol 6000) of 11 bars is required for a simulation of the ABA effect on water uptake.”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
In ABA-treated seeds, only 3 bars of osmotic pressure suppresses water uptake.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- an osmotic pressure of only 3 barse0
- Outcome
- water uptakee0
- Direction
- suppresse0
- Qualifier
- ABA-treated seedse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, in ABA-treated seeds an osmotic pressure of only 3 bars is sufficient to suppress water uptake.”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
ABA lowers embryo water absorption ability under osmotic stress.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- ABAe0
- Outcome
- ability of the embryo to absorb watere0
- Direction
- lowerse0
- Qualifier
- under osmotic stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus, ABA lowers the ability of the embryo to absorb water under osmotic stress.”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
ABA and osmoticum act synergistically on germination.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- ABA and osmoticume0
- Outcome
- complete synergistic interactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a two-factor analysis of the simultaneous action of ABA and osmoticum on germination, a complete synergistic interaction between these factors was found”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
ABA and cycloheximide exhibit independent multiplicative coaction.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- ABA and cycloheximidee0
- Outcome
- independent (multiplicative) coactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA and cycloheximide exhibit independent (multiplicative) coaction.”
e1“Germination of rape (Brassica napus L.) seeds”
Claim · model-written summary
The authors interpret ABA and osmotic stress as sharing a controlling point in seed water relations.
- Taxon
- Brassica napus L.Brassica napuse1
- Outcome
- water relations of germinating seedse0
- Qualifier
- common controlling point of ABA and osmotic stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results are interpreted in terms of a common controlling point of ABA and osmotic stress in the water relations of germinating seeds.”
e1“Germination of rape (Brassica napus L.) seeds”
The same questions in other papers
(+)-abscisic acid · growth · Brassica napus (oilseed rape)Positive and negative results
3 papers in the same direction as this paper · 9 in the opposite direction
- no effect
- positive
- positive
9 papers more in this group
See all 13 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.