Abstract
Black rot lesion development in cabbage leaves was correlated with accumulation of plugging material in the xylem vessels as Xanthomonas campestris multiplied and spread. Plug formation preceded a partial disorganization of the xylem, and spillage of bacteria from the vessels. The movement of eosin and 32 PO 4 3− was blocked within the vessels, and plugs caused water shortage in affected cells. Vein blackening, the first symptom of the disease, occurred after plugs had formed, and was associated with an accumulation of melanins among collapsing cells of the vascular bundle. The population of viable bacteria within the veins declined rapidly as the veins blackened.Advance of the bacteria in the xylem vessels accounted for the relationship between venation and lesion spread. A weakly virulent isolate spread extensively in the xylem vessels if inoculated with a virulent isolate, but not when inoculated alone. Acid mucopolysaccharide plugging material was not formed in vessels infected with the weakly virulent isolate.Water stress in cells of interveinal tissues of inoculated leaves resulted in chlorosis, loss in turgor, and loss of electrolytes. If net water loss from infected leaves was prevented by high atmospheric relative humidity, affected cells remained green and turgid and maintained their electrolyte balance.
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Claims 10
Claim · model-written summary
Lesion development correlated with xylem plugging as Xanthomonas campestris multiplied and spread.
- Taxon
- cabbage
Brassica oleracea var. capitatae0 - Organ / stage
- leavese0
- Interactor
- Xanthomonas campestris
_(25868012152).jpg?width=60)
Xanthomonas campestrise0pathogen - Outcome
- Black rot lesion developmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_(25868012152).jpg?width=500)
Verbatim
e0“Black rot lesion development in cabbage leaves was correlated with accumulation of plugging material in the xylem vessels as Xanthomonas campestris multiplied and spread”
Claim · model-written summary
Plug formation preceded partial xylem disorganization and bacterial spillage.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- partial disorganization of the xylem, and spillage of bacteriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plug formation preceded a partial disorganization of the xylem, and spillage of bacteria from the vessels”
t0“cabbage”
Claim · model-written summary
Xylem plugs blocked eosin and phosphate movement and caused water shortage in affected cells.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- water shortage in affected cellse0
- Qualifier
- plugse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The movement of eosin and 32 PO 4 3− was blocked within the vessels, and plugs caused water shortage in affected cells”
t0“cabbage”
Claim · model-written summary
Vein blackening followed plugging and was associated with melanins among collapsing vascular cells.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Organ / stage
- vascular bundlee0
- Compound
- melaninse0
- Outcome
- Vein blackeninge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vein blackening, the first symptom of the disease, occurred after plugs had formed, and was associated with an accumulation of melanins among collapsing cells of the vascular bundle”
t0“cabbage”
Claim · model-written summary
Viable bacterial populations in veins declined rapidly as veins blackened.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Organ / stage
- veinse0
- Outcome
- population of viable bacteria within the veinse0
- Direction
- declined rapidlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The population of viable bacteria within the veins declined rapidly as the veins blackened”
t0“cabbage”
Claim · model-written summary
Bacterial advance in xylem explained the relationship between venation and lesion spread.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- relationship between venation and lesion spreade0
- Qualifier
- Advance of the bacteria in the xylem vesselse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Advance of the bacteria in the xylem vessels accounted for the relationship between venation and lesion spread”
t0“cabbage”
Claim · model-written summary
A weakly virulent isolate spread extensively when co-inoculated with a virulent isolate, but not alone.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- inoculated with a virulent isolatee0
- Interactor
- weakly virulent isolatee0pathogen
- Second interactor
- virulent isolatee0pathogen
- Outcome
- weakly virulent isolate spreade0
- Direction
- extensivelye0
- Comparator
- inoculated alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A weakly virulent isolate spread extensively in the xylem vessels if inoculated with a virulent isolate, but not when inoculated alone”
t0“cabbage”
Claim · model-written summary
Weakly virulent infection did not produce acid mucopolysaccharide plugging material.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Interactor
- weakly virulent isolatee0pathogen
- Outcome
- Acid mucopolysaccharide plugging material was not formede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acid mucopolysaccharide plugging material was not formed in vessels infected with the weakly virulent isolate”
t0“cabbage”
Claim · model-written summary
Interveinal water stress caused chlorosis, turgor loss and electrolyte loss.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- chlorosis, loss in turgor, and loss of electrolytese0
- Qualifier
- Water stress in cells of interveinal tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress in cells of interveinal tissues of inoculated leaves resulted in chlorosis, loss in turgor, and loss of electrolytes”
t0“cabbage”
Claim · model-written summary
Preventing water loss by high humidity kept infected leaf cells green, turgid and in electrolyte balance.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- high atmospheric relative humiditye0
- Outcome
- affected cells remained green and turgid and maintained their electrolyte balancee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If net water loss from infected leaves was prevented by high atmospheric relative humidity, affected cells remained green and turgid and maintained their electrolyte balance”
t0“cabbage”
The same questions in other papers
inoculation · disease · Brassica oleracea (wild cabbage)Positive and negative results
17 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- positive
27 papers more in this group
See all 31 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.