Abstract
Abstract The objective of this study was to: first, evaluate the infection effects caused by Colletotrichum lindemuthianum pathogen (race 2047) on photosynthetic pigments and gas exchanges in Phaseolus vulgaris plants (cv. Mexico 222); and, second, determine infection effects on leaf pigments and their consequences on photosynthesis rate. A completely randomized design with a factorial scheme was used, combining two treatments (control and inoculated) and three evaluation periods (4th, 8th and 12th day). Carotenoid levels presented decreases of 28.3% and 35% during the 8th and 12th day after infection, when control and inoculated plants were compared. Correlation analysis demonstrated the direct relationship between carotenoids and photosynthesis rate ( r = 0.84). Total chlorophyll in infected plants had progressive reductions of 6.4%, 20.6% and 21.3% on the 4th, 8th and 12th day, respectively, when treated and untreated plants were compared. Total chlorophyll with photosynthesis ( r = 0.85) also revealed a significant and linear correlation. The photosynthetic rate in infected plants decreased by 22%, 49.9% and 77.3% on the 4th, 8th and 12th days after the inoculation, respectively. Anthracnose infection also induced negative effects concerning stomatal conductance, transpiration, photosynthesis and water use efficiency. Our results demonstrate that leaf pigment reduction as a result of pathogens was the main cause of lower gaseous exchanges in infected plants.
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Claims 12
Claim · model-written summary
Infected bean carotenoids were 28.3% lower on day 8.
- Taxon
- common bean
Phaseolus vulgarist0 - Treatment
- infectione0
- Outcome
- Carotenoid levelse0
- Direction
- decreasese0
- Value
- 28.3%e0
- Qualifier
- 8the0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carotenoid levels presented decreases of 28.3% and 35% during the 8th and 12th day after infection, when control and inoculated plants were compared.”
t0“common bean plants”
Claim · model-written summary
Infected bean carotenoids were 35% lower on day 12.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- infectione0
- Outcome
- Carotenoid levelse0
- Direction
- decreasese0
- Value
- 35%e0
- Qualifier
- 12the0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carotenoid levels presented decreases of 28.3% and 35% during the 8th and 12th day after infection, when control and inoculated plants were compared.”
t0“common bean plants”
Claim · model-written summary
Carotenoids correlated positively with photosynthesis rate (r = 0.84).
- Taxon
- common beanPhaseolus vulgarist0
- Compound
- carotenoidse0
- Outcome
- photosynthesis ratee0
- Direction
- direct relationshipe0
- Value
- r = 0.84e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Correlation analysis demonstrated the direct relationship between carotenoids and photosynthesis rate ( r = 0.84).”
t0“common bean plants”
Claim · model-written summary
Infected plants had 6.4% less total chlorophyll on day 4.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- infectede0
- Outcome
- Total chlorophylle0
- Direction
- reductionse0
- Value
- 6.4%e0
- Qualifier
- 4the0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll in infected plants had progressive reductions of 6.4%, 20.6% and 21.3% on the 4th, 8th and 12th day, respectively, when treated and untreated plants were compared.”
t0“common bean plants”
Claim · model-written summary
Infected plants had 20.6% less total chlorophyll on day 8.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- infectede0
- Outcome
- Total chlorophylle0
- Direction
- reductionse0
- Value
- 20.6%e0
- Qualifier
- 8the0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll in infected plants had progressive reductions of 6.4%, 20.6% and 21.3% on the 4th, 8th and 12th day, respectively, when treated and untreated plants were compared.”
t0“common bean plants”
Claim · model-written summary
Infected plants had 21.3% less total chlorophyll on day 12.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- infectede0
- Outcome
- Total chlorophylle0
- Direction
- reductionse0
- Value
- 21.3%e0
- Qualifier
- 12the0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll in infected plants had progressive reductions of 6.4%, 20.6% and 21.3% on the 4th, 8th and 12th day, respectively, when treated and untreated plants were compared.”
t0“common bean plants”
Claim · model-written summary
Total chlorophyll correlated linearly with photosynthesis (r = 0.85).
- Taxon
- common beanPhaseolus vulgarist0
- Compound
- Total chlorophylle0
- Outcome
- photosynthesise0
- Direction
- linear correlatione0
- Value
- r = 0.85e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll with photosynthesis ( r = 0.85) also revealed a significant and linear correlation.”
t0“common bean plants”
Claim · model-written summary
Photosynthetic rate declined 22% on day 4 after inoculation.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- inoculatione0
- Outcome
- photosynthetic ratee0
- Direction
- decreasede0
- Value
- 22%e0
- Qualifier
- 4the0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic rate in infected plants decreased by 22%, 49.9% and 77.3% on the 4th, 8th and 12th days after the inoculation, respectively.”
t0“common bean plants”
Claim · model-written summary
Photosynthetic rate declined 49.9% on day 8 after inoculation.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- inoculatione0
- Outcome
- photosynthetic ratee0
- Direction
- decreasede0
- Value
- 49.9%e0
- Qualifier
- 8the0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic rate in infected plants decreased by 22%, 49.9% and 77.3% on the 4th, 8th and 12th days after the inoculation, respectively.”
t0“common bean plants”
Claim · model-written summary
Photosynthetic rate declined 77.3% on day 12 after inoculation.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- inoculatione0
- Outcome
- photosynthetic ratee0
- Direction
- decreasede0
- Value
- 77.3%e0
- Qualifier
- 12the0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic rate in infected plants decreased by 22%, 49.9% and 77.3% on the 4th, 8th and 12th days after the inoculation, respectively.”
t0“common bean plants”
Claim · model-written summary
Anthracnose infection negatively affected stomatal conductance, transpiration and water use efficiency.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- Anthracnose infectione0
- Outcome
- stomatal conductance, transpiratione0
- Direction
- negative effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Anthracnose infection also induced negative effects concerning stomatal conductance, transpiration, photosynthesis and water use efficiency.”
t0“common bean plants”
Claim · model-written summary
The authors attributed lower gaseous exchange to pathogen-induced leaf pigment loss.
- Taxon
- common beanPhaseolus vulgarist0
- Outcome
- lower gaseous exchangese0
- Qualifier
- leaf pigment reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results demonstrate that leaf pigment reduction as a result of pathogens was the main cause of lower gaseous exchanges in infected plants.”
t0“common bean plants”
The same questions in other papers
inoculation · physiology: photosynthesis · Phaseolus vulgaris (common bean)Positive and negative results
4 papers in the same direction as this paper · 10 in the opposite direction
- positive
- positive
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See all 15 papers →infection · physiology: pigments · Phaseolus vulgaris (common bean)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
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.