Abstract
The effects of several plant lectins on the production of a pea phytoalexin, pisatin, were examined. Con A, PHA, PNA and PSA each induced the production of pisatin in pea epicotyl tissues, demonstrating that plant lectins can act as elicitors. The production of pisatin in response to PHA, PNA or PSA was not affected by the simultaneous presence of the respective hapten sugars, whereas haptens specific for Con A, such as α-D-mannose and methyl-α-D-mannoside, abolished the induction of pisatin by Con A. These results indicate that the elicitor effect of Con A is attributable to its ability to bind to specific carbohydrates in pea cells. Induction of the production of pisatin by Con A was markedly inhibited by the suppressor derived from a pea pathogen, Mycosphaerella pinodes, and by several inhibitors related to signal-transduction pathways. It is suggested, therefore, that the Con A-induced production of pisatin in pea tissues might be associated with activation of a signal-transduction pathway. An additive effect on the accumulation of pisatin was observed when Con A was present with a polysaccharide elicitor from M. pinodes, suggesting that exogenous Con A does not compete with the recognition site(s) for the fungal elicitor in pea cells. The present data also indicate that Con A may be useful for characterization of the signal-transduction system that leads to the synthesis of phytoalexin in pea epicotyl tissues.
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Claims 14
Claim · model-written summary
Con A induced pisatin production in pea epicotyl tissues.
- Taxon
- Pisum sativum
Lathyrus oleraceust0 - Organ / stage
- pea epicotyl tissuese1
- Treatment
- Con Ae1
- Outcome
- production of pisatine1
- Direction
- inducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e1“Con A, PHA, PNA and PSA each induced the production of pisatin in pea epicotyl tissues”
Claim · model-written summary
PHA induced pisatin production in pea epicotyl tissues.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Organ / stage
- pea epicotyl tissuese1
- Treatment
- PHAe1
- Outcome
- production of pisatine1
- Direction
- inducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e1“Con A, PHA, PNA and PSA each induced the production of pisatin in pea epicotyl tissues”
Claim · model-written summary
PNA induced pisatin production in pea epicotyl tissues.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Organ / stage
- pea epicotyl tissuese1
- Treatment
- PNAe1
- Outcome
- production of pisatine1
- Direction
- inducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e1“Con A, PHA, PNA and PSA each induced the production of pisatin in pea epicotyl tissues”
Claim · model-written summary
PSA induced pisatin production in pea epicotyl tissues.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Organ / stage
- pea epicotyl tissuese1
- Treatment
- PSAe1
- Outcome
- production of pisatine1
- Direction
- inducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e1“Con A, PHA, PNA and PSA each induced the production of pisatin in pea epicotyl tissues”
Claim · model-written summary
Pisatin production in response to PHA was not affected by its respective hapten sugars.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- PHAe2
- Outcome
- production of pisatine2
- Direction
- not affectede2
- Qualifier
- simultaneous presence of the respective hapten sugarse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e2“The production of pisatin in response to PHA, PNA or PSA was not affected by the simultaneous presence of the respective hapten sugars”
Claim · model-written summary
Pisatin production in response to PNA was not affected by its respective hapten sugars.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- PNAe2
- Outcome
- production of pisatine2
- Direction
- not affectede2
- Qualifier
- simultaneous presence of the respective hapten sugarse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e2“The production of pisatin in response to PHA, PNA or PSA was not affected by the simultaneous presence of the respective hapten sugars”
Claim · model-written summary
Pisatin production in response to PSA was not affected by its respective hapten sugars.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- PSAe2
- Outcome
- production of pisatine2
- Direction
- not affectede2
- Qualifier
- simultaneous presence of the respective hapten sugarse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e2“The production of pisatin in response to PHA, PNA or PSA was not affected by the simultaneous presence of the respective hapten sugars”
Claim · model-written summary
Haptens specific for Con A (α-D-mannose and methyl-α-D-mannoside) abolished Con A-induced pisatin production.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- α-D-mannose and methyl-α-D-mannosidee3
- Outcome
- induction of pisatin by Con Ae3
- Direction
- abolishede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e3“haptens specific for Con A, such as α-D-mannose and methyl-α-D-mannoside, abolished the induction of pisatin by Con A”
Claim · model-written summary
The suppressor derived from the pea pathogen Mycosphaerella pinodes markedly inhibited Con A-induced pisatin production.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- suppressor derived from a pea pathogen, Mycosphaerella pinodese4
- Interactor
- Mycosphaerella pinodes
Didymella pinodese4pathogen - Outcome
- Induction of the production of pisatin by Con Ae4
- Direction
- markedly inhibitede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e4“Induction of the production of pisatin by Con A was markedly inhibited by the suppressor derived from a pea pathogen, Mycosphaerella pinodes, and by several inhibitors related to signal-transduction pathways”
Claim · model-written summary
Several inhibitors related to signal-transduction pathways inhibited Con A-induced pisatin production.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- several inhibitors related to signal-transduction pathwayse4
- Outcome
- Induction of the production of pisatin by Con Ae4
- Direction
- inhibitede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e4“Induction of the production of pisatin by Con A was markedly inhibited by the suppressor derived from a pea pathogen, Mycosphaerella pinodes, and by several inhibitors related to signal-transduction pathways”
Claim · model-written summary
Con A combined with a polysaccharide elicitor from M. pinodes had an additive effect on pisatin accumulation.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- polysaccharide elicitor from M. pinodese5
- Interactor
- M. pinodesDidymella pinodese5pathogen
- Outcome
- accumulation of pisatine5
- Direction
- additive effecte5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e5“An additive effect on the accumulation of pisatin was observed when Con A was present with a polysaccharide elicitor from M. pinodes”
Claim · model-written summary
Exogenous Con A appears not to compete with the fungal elicitor for its recognition sites in pea cells.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- exogenous Con Ae6
- Outcome
- does not compete with the recognition site(s) for the fungal elicitore6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e6“suggesting that exogenous Con A does not compete with the recognition site(s) for the fungal elicitor in pea cells”
Claim · model-written summary
Con A-induced pisatin production might be associated with activation of a signal-transduction pathway.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- Con Ae7
- Outcome
- production of pisatine7
- Qualifier
- activation of a signal-transduction pathwaye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e7“It is suggested, therefore, that the Con A-induced production of pisatin in pea tissues might be associated with activation of a signal-transduction pathway”
Claim · model-written summary
Con A may be useful for characterizing the signal-transduction system that leads to phytoalexin synthesis.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- characterization of the signal-transduction systeme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“Con A may be useful for characterization of the signal-transduction system that leads to the synthesis of phytoalexin in pea epicotyl tissues”
The same questions in other papers
resistance inducer · molecular: metabolites · Lathyrus oleraceus (pea)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.