Abstract
Two populations of rapid-cycling Brassica rapa L. selected for differential waterlogging tolerance and a commercially available standard population were compared in their structural responses to waterlogging. Rates of dry matter accrual were similar under drained conditions but were lower after 6 days of waterlogging, especially in the sensitive population. Chlorophyll content of leaves from the sensitive population was significantly lower than the tolerant population. Examination of the foliage by TEM after 4 days of waterlogging revealed large starch grains that apparently disrupted the grana stacks in the sensitive population. Root morphology also distinguished the populations. After 8 days of waterlogging, numerous adventitious roots were visible in the standard and tolerant populations but not in the sensitive population. No aerenchyma was detected by examination of root cross sections. Mitochondrial morphology was affected by waterlogging, resulting in elongate, branched organelles. Isozyme analysis of malic enzyme, malate dehydrogenase, glucose-6-phosphate dehydrogenase, and pyruvate decarboxylase revealed no differences due to population, treatment, or duration. Isozymes of alcohol dehydrogenase varied with duration of waterlogging, and isozyme forms of phosphoglucomutase were distinct depending on the population. The appearance of stress-specific structural features in populations of B. rapa is discussed in relation to differences in waterlogging tolerance. Key words: hypoxia, isozymes, aerenchyma, adventitious roots, waterlogging, starch.
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Claims 11
Claim · model-written summary
Dry matter accrual was lower after 6 days of waterlogging, especially in the sensitive population
- Taxon
- Brassica rapa
Brassica rapae0 - Material
- sensitive populatione1
- Treatment
- waterlogginge1
- Outcome
- dry matter accruale1
- Direction
- lowere1
- Qualifier
- after 6 dayse1
- Comparator
- drained conditionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e1“Rates of dry matter accrual were similar under drained conditions but were lower after 6 days of waterlogging, especially in the sensitive population”
Claim · model-written summary
Dry matter accrual was similar under drained conditions
- Taxon
- Brassica rapaBrassica rapae0
- Outcome
- dry matter accruale1
- Qualifier
- similar under drained conditionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e1“Rates of dry matter accrual were similar under drained conditions but were lower after 6 days of waterlogging, especially in the sensitive population”
Claim · model-written summary
Chlorophyll content of leaves was significantly lower in the sensitive than in the tolerant population
- Taxon
- Brassica rapaBrassica rapae0
- Material
- sensitive populatione2
- Organ / stage
- leavese2
- Outcome
- Chlorophyll contente2
- Direction
- lowere2
- Comparator
- tolerant populatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e2“Chlorophyll content of leaves from the sensitive population was significantly lower than the tolerant population”
Claim · model-written summary
After 4 days of waterlogging, large starch grains apparently disrupted grana stacks in the sensitive population
- Taxon
- Brassica rapaBrassica rapae0
- Material
- sensitive populatione3
- Treatment
- waterlogginge4
- Outcome
- grana stackse3
- Qualifier
- large starch grainse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e3“large starch grains that apparently disrupted the grana stacks in the sensitive population”
e4“after 4 days of waterlogging”
Claim · model-written summary
Adventitious roots were visible after 8 days of waterlogging in standard and tolerant populations but not in the sensitive population
- Taxon
- Brassica rapaBrassica rapae0
- Material
- standard and tolerant populationse5
- Treatment
- waterlogginge6
- Outcome
- adventitious rootse5
- Comparator
- sensitive populatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e5“numerous adventitious roots were visible in the standard and tolerant populations but not in the sensitive population”
e6“After 8 days of waterlogging”
Claim · model-written summary
No aerenchyma was detected in root cross sections
- Taxon
- Brassica rapaBrassica rapae0
- Organ / stage
- root cross sectionse7
- Outcome
- aerenchymae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e7“No aerenchyma was detected by examination of root cross sections”
Claim · model-written summary
Waterlogging altered mitochondrial morphology into elongate, branched organelles
- Taxon
- Brassica rapaBrassica rapae0
- Treatment
- waterlogginge1
- Outcome
- Mitochondrial morphologye1
- Qualifier
- elongate, branched organellese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e1“Mitochondrial morphology was affected by waterlogging, resulting in elongate, branched organelles”
Claim · model-written summary
Malic enzyme, malate dehydrogenase and glucose-6-phosphate dehydrogenase isozymes showed no differences
- Taxon
- Brassica rapaBrassica rapae0
- Gene
- malic enzyme, malate dehydrogenase, glucose-6-phosphate dehydrogenasee1
- Outcome
- Isozyme analysise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e1“Isozyme analysis of malic enzyme, malate dehydrogenase, glucose-6-phosphate dehydrogenase, and pyruvate decarboxylase revealed no differences due to population, treatment, or duration”
Claim · model-written summary
Pyruvate decarboxylase isozymes showed no differences
- Taxon
- Brassica rapaBrassica rapae0
- Gene
- pyruvate decarboxylasee1
- Outcome
- Isozyme analysise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e1“Isozyme analysis of malic enzyme, malate dehydrogenase, glucose-6-phosphate dehydrogenase, and pyruvate decarboxylase revealed no differences due to population, treatment, or duration”
Claim · model-written summary
Alcohol dehydrogenase isozymes varied with duration of waterlogging
- Taxon
- Brassica rapaBrassica rapae0
- Treatment
- duration of waterlogginge1
- Gene
- alcohol dehydrogenasee1
- Outcome
- Isozymese1
- Direction
- variede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e1“Isozymes of alcohol dehydrogenase varied with duration of waterlogging”
Claim · model-written summary
Phosphoglucomutase isozyme forms were distinct between populations
- Taxon
- Brassica rapaBrassica rapae0
- Gene
- phosphoglucomutasee1
- Outcome
- isozyme formse1
- Qualifier
- depending on the populatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica rapa L. selected for differential waterlogging tolerance”
e1“isozyme forms of phosphoglucomutase were distinct depending on the population”
The same questions in other papers
flooding · growth · Brassica rapa (field mustard)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.