Abstract
ABSTRACT The effects of solitary and concurrent infection by Pratylenchus pene-trans and Verticillium dahliae on gas exchange of Russet Burbank potato (Solanum tuberosum) were studied in growth chamber experiments. Treatments were P. penetrans at low, medium, and high density; V. dahliae alone at one initial density; the combination of the nematode at these three densities and V. dahliae; and a noninfested control. Gas exchange parameters of leaf cohorts of different ages in the different treatments were repeatedly measured with a Li-Cor LI-6200 portable photosynthesis system. At 45 days after planting, joint infection significantly reduced net photosynthesis, stomatal conductance, and transpiration of 1- to 25-day-old leaf cohorts. Intercellular CO(2) levels were significantly increased by co-infection, especially in older leaves. The synergistic effect of co-infection on gas exchange parameters was greater in the oldest cohort than in the youngest cohort. No consistent effects on leaf gas exchange parameters were observed in plants infected by the nematode or the fungus alone. The relationship between the assimilation rate and stomatal conductance remained linear regardless of solitary or concomitant infection, indicating that stomatal factors are primarily responsible for regulating photosynthesis. The significant reduction of gas exchange in leaves of co-infected plants without reduction in intercellular CO(2) concentrations suggests that nonstomatal factors also play a role when both organisms are present.
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Claims 8
Claim · model-written summary
Joint infection reduced net photosynthesis in young and older potato leaf cohorts at 45 days after planting.
- Taxon
- potato
Solanum tuberosume1 - Material
- Russet Burbanke1
- Organ / stage
- 1- to 25-day-old leaf cohortse0
- Treatment
- joint infectione0
- Interactor
- Pratylenchus pene-trans
Pratylenchus penetranse1pathogen - Second interactor
- Verticillium dahliae
Verticillium dahliaee1pathogen - Outcome
- net photosynthesise0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“joint infection significantly reduced net photosynthesis, stomatal conductance, and transpiration of 1- to 25-day-old leaf cohorts”
e1“Pratylenchus pene-trans and Verticillium dahliae on gas exchange of Russet Burbank potato (Solanum tuberosum)”
Claim · model-written summary
Joint infection reduced stomatal conductance and transpiration.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- joint infectione0
- Interactor
- Pratylenchus pene-transPratylenchus penetranse1pathogen
- Second interactor
- Verticillium dahliaeVerticillium dahliaee1pathogen
- Outcome
- stomatal conductance, and transpiratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“joint infection significantly reduced net photosynthesis, stomatal conductance, and transpiration of 1- to 25-day-old leaf cohorts”
e1“Pratylenchus pene-trans and Verticillium dahliae on gas exchange of Russet Burbank potato (Solanum tuberosum)”
Claim · model-written summary
Co-infection increased intercellular CO(2), especially in older leaves.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- older leavese0
- Treatment
- co-infectione0
- Interactor
- Pratylenchus penetransPratylenchus penetranst1pathogen
- Second interactor
- Verticillium dahliaeVerticillium dahliaet1pathogen
- Outcome
- Intercellular CO(2) levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercellular CO(2) levels were significantly increased by co-infection, especially in older leaves.”
t0“Potato”
t1“Pratylenchus penetrans and Verticillium dahliae”
Claim · model-written summary
The gas-exchange effect of joint infection was greater in the oldest than youngest leaf cohort.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- oldest cohorte0
- Outcome
- gas exchange parameterse0
- Direction
- greatere0
- Comparator
- youngest cohorte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The synergistic effect of co-infection on gas exchange parameters was greater in the oldest cohort than in the youngest cohort.”
t0“Potato”
Claim · model-written summary
Solitary nematode or fungus infection had no consistent leaf gas-exchange effects.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- leaf gas exchange parameterse0
- Direction
- No consistent effectse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No consistent effects on leaf gas exchange parameters were observed in plants infected by the nematode or the fungus alone.”
t0“Potato”
Claim · model-written summary
Assimilation rate and stomatal conductance remained linearly related across infection states.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- solitary or concomitant infectione0
- Outcome
- relationship between the assimilation rate and stomatal conductancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between the assimilation rate and stomatal conductance remained linear regardless of solitary or concomitant infection”
t0“Potato”
Claim · model-written summary
Stomatal factors were interpreted as primarily regulating photosynthesis.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- photosynthesise0
- Qualifier
- stomatal factorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal factors are primarily responsible for regulating photosynthesis”
t0“Potato”
Claim · model-written summary
Nonstomatal factors were interpreted as contributing to reduced gas exchange under co-infection.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- gas exchangee0
- Qualifier
- nonstomatal factorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant reduction of gas exchange in leaves of co-infected plants without reduction in intercellular CO(2) concentrations suggests that nonstomatal factors also play a role when both organisms are present.”
t0“Potato”
The same questions in other papers
infection · Pratylenchus penetrans · Solanum tuberosum (potato)Results agree
2 papers in the same direction as this paper
- no effect
- no effect
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.