Abstract
Physiological examination of resistant and susceptible bean genotypes has shown that the concentration and quantitative ratios of carbohydrates measurable in leaf tissues depend on the age of leaves. During the phases of ontogenesis, the glucose and sucrose levels are the lowest in the primary leaves and highest in the youngest upper leaf. There is a continuous increase in the concentration of both carbohydrates from the oldest to the youngest leaves. The glucose/sucrose quantitative ratio decreases with ageing of the leaves until blooming. Our results indicate that the glucose concentration decreases considerably in the susceptible bean leaves after infection with the bean pathogen Pseudomonas savastanoi pv. phaseolicola. It has been proved that the glucose plays an important role in the formation of the bacterial extracellular polysaccharide (EPS) coat. Because there is a positive correlation between the age-dependent bacterial-resistance and the low sugar (especially glucose) content in older leaves of the originally susceptible bean plant, we think that in the old leaves there is not enough glucose for production of the EPS coat. Lacking EPS coat the bacterial and plant cell walls come in direct contact which permits the induction of hypersensitivity response characteristic of resistance
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Claims 10
Claim · model-written summary
Leaf carbohydrate concentration and ratios depended on leaf age in bean genotypes.
- Taxon
- Snap Beant0
- Organ / stage
- age of leavese0
- Outcome
- concentration and quantitative ratios of carbohydratese0
Not reportedDirection
Verbatim
e0“the concentration and quantitative ratios of carbohydrates measurable in leaf tissues depend on the age of leaves.”
t0“Snap Bean”
Claim · model-written summary
Glucose was lowest in primary leaves and highest in youngest upper leaves.
Verbatim
e0“the glucose and sucrose levels are the lowest in the primary leaves and highest in the youngest upper leaf.”
t0“Snap Bean”
Claim · model-written summary
Sucrose was lowest in primary leaves and highest in youngest upper leaves.
Verbatim
e0“the glucose and sucrose levels are the lowest in the primary leaves and highest in the youngest upper leaf.”
t0“Snap Bean”
Claim · model-written summary
Glucose and sucrose concentrations rose from oldest to youngest leaves.
Verbatim
e0“There is a continuous increase in the concentration of both carbohydrates from the oldest to the youngest leaves.”
t0“Snap Bean”
Claim · model-written summary
The glucose/sucrose ratio declined with leaf ageing until bloom.
Verbatim
e0“The glucose/sucrose quantitative ratio decreases with ageing of the leaves until blooming.”
t0“Snap Bean”
Claim · model-written summary
Pseudomonas infection substantially lowered glucose in susceptible bean leaves.
- Taxon
- beane0
- Material
- susceptible beane0
- Treatment
- infection with the bean pathogen Pseudomonas savastanoi pv. phaseolicolae0
- Interactor
- Pseudomonas savastanoi pv. phaseolicolaPseudomonas savastanoi pv. phaseolicolae0pathogen
- Outcome
- glucose concentratione0
- Direction
- decreasese0
Not reportedComparator
Verbatim
e0“the glucose concentration decreases considerably in the susceptible bean leaves after infection with the bean pathogen Pseudomonas savastanoi pv. phaseolicola.”
Claim · model-written summary
Glucose contributes to bacterial EPS coat formation.
Verbatim
e0“the glucose plays an important role in the formation of the bacterial extracellular polysaccharide (EPS) coat.”
t0“Snap Bean”
Claim · model-written summary
Older, lower-sugar leaves had greater bacterial resistance.
Not reportedDirection
Verbatim
e0“there is a positive correlation between the age-dependent bacterial-resistance and the low sugar (especially glucose) content in older leaves of the originally susceptible bean plant”
Claim · model-written summary
The authors propose low glucose limits EPS coat production in old leaves.
Verbatim
e0“we think that in the old leaves there is not enough glucose for production of the EPS coat.”
t0“Snap Bean”
Claim · model-written summary
The authors propose that absence of the EPS coat allows cell-wall contact and hypersensitivity response.
Verbatim
e0“Lacking EPS coat the bacterial and plant cell walls come in direct contact which permits the induction of hypersensitivity response characteristic of resistance”
t0“Snap Bean”
The same questions in other papers
infection · molecular: metabolites · Phaseolus vulgaris (common bean)Positive and negative results
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2 papers more in this group
See all 6 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.