Abstract
The response of five inbred sunflower seedling lines, including AC 4122, C, HA 89, HA 410, HA 411, to inoculation with Sclerotinia sclerotiorum culture filtrate containing endogenous oxalic acid was compared with the exogenous application of synthetic oxalic acid. The reaction of seedlings was evaluated in terms of dry and fresh plant weights and the total chlorophyll concentration relative to untreated controls. The expression of shikimate dehydrogenase in cotyledons was also assessed five days after treatment. The results indicated that exogenous oxalic acid inoculation caused more deleterious effects on stem rot, eliciting photosynthesis reduction and different isoenzyme patterns of shikimate dehydrogenase. A positive correlation was found between increased oxalic acid and shikimate dehydrogenase activity in both treatments. However, the excessive toxicity of the exogenously administrated acid suggests that Sclerotinia sclerotiorum infection triggers a more complex metabolic pathway involving oxalic acid secreted by the pathogen. These observations preclude the possibility of using the synthetic acid administration as a method of screening sunflower genotypes for resistance to Sclerotinia . In addition to these findings, the reactivation of shikimate dehydrogenase was observed in both treatments. In contrast to synthetic administration, expression during the first phase of growth may serve as a tool for rapid screening and selection of sunflower genotypes resistant to Sclerotinia sclerotiorum.
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Claims 7
Claim · model-written summary
Exogenous oxalic acid caused more deleterious stem rot effects and reduced photosynthesis.
- Taxon
- Sunflower
Helianthus annuust0 - Treatment
- exogenous oxalic acid inoculatione0
- Outcome
- stem rote0
- Direction
- more deleteriouse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous oxalic acid inoculation caused more deleterious effects on stem rot, eliciting photosynthesis reduction”
t0“Sunflower Genotypes”
Claim · model-written summary
Exogenous oxalic acid reduced photosynthesis.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- exogenous oxalic acid inoculatione0
- Outcome
- photosynthesise0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous oxalic acid inoculation caused more deleterious effects on stem rot, eliciting photosynthesis reduction”
t0“Sunflower Genotypes”
Claim · model-written summary
Exogenous oxalic acid elicited different shikimate dehydrogenase isoenzyme patterns.
- Taxon
- SunflowerHelianthus annuust0
- Gene
- shikimate dehydrogenasee0
- Outcome
- different isoenzyme patternse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different isoenzyme patterns of shikimate dehydrogenase”
t0“Sunflower Genotypes”
Claim · model-written summary
Higher oxalic acid correlated positively with shikimate dehydrogenase activity in both treatments.
- Taxon
- SunflowerHelianthus annuust0
- Gene
- shikimate dehydrogenasee0
- Compound
- oxalic acide0
- Outcome
- shikimate dehydrogenase activitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive correlation was found between increased oxalic acid and shikimate dehydrogenase activity in both treatments.”
t0“Sunflower Genotypes”
Claim · model-written summary
Shikimate dehydrogenase was reactivated in both treatments.
- Taxon
- SunflowerHelianthus annuust0
- Gene
- shikimate dehydrogenasee0
- Outcome
- reactivation of shikimate dehydrogenasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reactivation of shikimate dehydrogenase was observed in both treatments”
t0“Sunflower Genotypes”
Claim · model-written summary
The authors reject synthetic acid administration for screening sunflower resistance to Sclerotinia.
- Taxon
- sunflowerHelianthus annuuse0
- Interactor
- Sclerotinia
Sclerotiniae0pathogen - Outcome
- preclude the possibility of using the synthetic acid administration as a method of screeninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These observations preclude the possibility of using the synthetic acid administration as a method of screening sunflower genotypes for resistance to Sclerotinia .”
Claim · model-written summary
Early growth phase expression may enable rapid screening of resistant sunflower genotypes.
- Taxon
- sunflowerHelianthus annuuse0
- Interactor
- Sclerotinia sclerotiorum
Sclerotinia sclerotiorume0pathogen - Outcome
- rapid screening and selectione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expression during the first phase of growth may serve as a tool for rapid screening and selection of sunflower genotypes resistant to Sclerotinia sclerotiorum”
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