Abstract
Abstract Periods of drought frequently affect the development of winter rape at the shooting stage in spring. A growth chamber study was conducted to determine the effects of 13 days of strong water deficit at the shooting stage followed by rewatering on oilseed rape ( Brassica napus ). The osmolality and the efficiency of photosystem II in leaves were measured by means of a vapour pressure osmometer and a chlorophyll fluorometer, respectively. The activities of sucrose cleaving enzymes in leaves were determined through invertase as well as sucrose synthase tests. A higher osmotic pressure was observed 2 days after water deprivation. Extracellular and vacuolar invertases as well as chlorophyll fluorescence were decreased with delay. Rewatering led to a gradual decrease in the osmotic pressure and a delayed increase in the enzyme activities as well as the photosynthetic efficiency. A linear regression model could predict osmolality in well‐watered plants based on the extracellular enzyme activity and growth stage. The ontogenetic and stress‐related pattern of extracellular invertase activity could indicate a role of this enzyme in balancing source‐sink relations. The onset of flowering was not influenced by drought, but the period of this stage was prolonged. Though, the ontogenetic stages of stressed and unstressed plants were the same at the time of harvest, the development of seed biomass was significantly depressed under stress.
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Claims 10
Claim · model-written summary
Water deprivation increased osmotic pressure after two days.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- water deprivatione0
- Outcome
- osmotic pressuree0
- Direction
- highere0
- Qualifier
- 2 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“A higher osmotic pressure was observed 2 days after water deprivation.”
t0“Brassica napus”
Claim · model-written summary
Drought decreased extracellular and vacuolar invertases and chlorophyll fluorescence with a delay.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- strong water deficite1
- Outcome
- Extracellular and vacuolar invertases as well as chlorophyll fluorescencee0
- Direction
- decreasede0
- Qualifier
- with delaye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extracellular and vacuolar invertases as well as chlorophyll fluorescence were decreased with delay.”
e1“13 days of strong water deficit at the shooting stage followed by rewatering”
t0“Brassica napus”
Claim · model-written summary
Rewatering gradually decreased osmotic pressure.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- Rewateringe0
- Outcome
- osmotic pressuree0
- Direction
- decreasee0
- Qualifier
- graduale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rewatering led to a gradual decrease in the osmotic pressure and a delayed increase in the enzyme activities as well as the photosynthetic efficiency.”
t0“Brassica napus”
Claim · model-written summary
Rewatering increased enzyme activities and photosynthetic efficiency with a delay.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- Rewateringe0
- Outcome
- enzyme activities as well as the photosynthetic efficiencye0
- Direction
- increasee0
- Qualifier
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rewatering led to a gradual decrease in the osmotic pressure and a delayed increase in the enzyme activities as well as the photosynthetic efficiency.”
t0“Brassica napus”
Claim · model-written summary
A linear regression model could predict well-watered plant osmolality from extracellular enzyme activity and growth stage.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- predict osmolalitye0
- Qualifier
- well‐watered plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A linear regression model could predict osmolality in well‐watered plants based on the extracellular enzyme activity and growth stage.”
t0“Brassica napus”
Claim · model-written summary
Extracellular invertase activity patterns could indicate a role in balancing source-sink relations.
- Taxon
- Brassica napusBrassica napust0
- Gene
- extracellular invertasee0
- Outcome
- balancing source‐sink relationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ontogenetic and stress‐related pattern of extracellular invertase activity could indicate a role of this enzyme in balancing source‐sink relations.”
t0“Brassica napus”
Claim · model-written summary
Drought did not influence flowering onset.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- droughte0
- Outcome
- onset of floweringe0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The onset of flowering was not influenced by drought, but the period of this stage was prolonged.”
t0“Brassica napus”
Claim · model-written summary
Drought prolonged the flowering period.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- droughte0
- Outcome
- period of this stagee0
- Direction
- prolongede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The onset of flowering was not influenced by drought, but the period of this stage was prolonged.”
t0“Brassica napus”
Claim · model-written summary
Stressed and unstressed plants were at the same ontogenetic stages at harvest.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- stresse0
- Outcome
- ontogenetic stagese0
- Direction
- samee0
- Qualifier
- at the time of harveste0
- Comparator
- unstressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Though, the ontogenetic stages of stressed and unstressed plants were the same at the time of harvest, the development of seed biomass was significantly depressed under stress.”
t0“Brassica napus”
Claim · model-written summary
Stress significantly depressed seed biomass development.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- stresse0
- Outcome
- development of seed biomasse0
- Direction
- depressede0
- Comparator
- unstressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Though, the ontogenetic stages of stressed and unstressed plants were the same at the time of harvest, the development of seed biomass was significantly depressed under stress.”
t0“Brassica napus”
The same questions in other papers
drought · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
17 papers in the same direction as this paper · 2 in the opposite direction
- negative
- positive
- positive
16 papers more in this group
See all 20 papers →drought · phenology · Brassica napus (oilseed rape)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.