Abstract
The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated. PPO was strongly induced by wounding or JA, and the response was also shown to be systemically induced by wounding. Mechanical wounding in cotyledon or leaf produced a signal that caused the concentration of PPO to increase in the unwounded cotyledon, in the first leaves but not in the second leaves. Severity of wounding and light intensity also affected wound induced change in PPO activity, JA showed a stimulatory effect on the loss of chlorophyll and the rapid increase in PPO activity. The PPO was clearly more active in the wounded leaves than in controls. The potency and specificity of the JA indicate a close relationship between JA and wound-induced changes in PPO in tomato species. JA and abscisic acid(ABA) acted similarly on both unwounded and wounded leaves, but the amount of PPO in the wounded leaves was always more than the respective controls. The highest increase in PPO activity occurred in woundand JA-induced leaves of seedlings kept under bright lighting. Benzyladenine(BA) completely abolished JA- and ABA-induced PPO activity. The results suggest that JA-induced PPO activity is due to de novo PPO synthesis. Histochemical tests for PPO in stems of wound- and JA -treated tomato plants indicate that PPO was localized primarily, in the. outer .cortex . and xylem parenchyma. It is concluded that exogenously applied JA acts as stress agents and PPO may be a component of the inducible anti-hervivore defense response.
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Claims 9
Claim · model-written summary
Wounding or JA strongly induced PPO in tomato seedlings
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- wounding or JAe1
- Outcome
- PPOe1
- Direction
- inducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e1“PPO was strongly induced by wounding or JA”
Claim · model-written summary
Mechanical wounding of cotyledon or leaf increased PPO in the unwounded cotyledon and first leaves but not in the second leaves
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- first leavese2
- Treatment
- Mechanical wounding in cotyledon or leafe2
- Outcome
- concentration of PPOe2
- Direction
- increasee2
- Qualifier
- not in the second leavese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e2“Mechanical wounding in cotyledon or leaf produced a signal that caused the concentration of PPO to increase in the unwounded cotyledon, in the first leaves but not in the second leaves”
Claim · model-written summary
Severity of wounding and light intensity affected the wound-induced change in PPO activity
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Severity of wounding and light intensitye3
- Outcome
- wound induced change in PPO activitye3
- Qualifier
- affectede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e3“Severity of wounding and light intensity also affected wound induced change in PPO activity”
Claim · model-written summary
The largest PPO activity increase occurred in wounded and JA-induced leaves under bright lighting
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese4
- Treatment
- bright lightinge4
- Outcome
- PPO activitye4
- Direction
- highest increasee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e4“The highest increase in PPO activity occurred in woundand JA-induced leaves of seedlings kept under bright lighting”
Claim · model-written summary
PPO amount in wounded leaves was always higher than in the respective controls
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- wounded leavese5
- Outcome
- amount of PPOe5
- Direction
- moree5
- Comparator
- respective controlse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e5“but the amount of PPO in the wounded leaves was always more than the respective controls”
Claim · model-written summary
Benzyladenine abolished JA- and ABA-induced PPO activity
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Benzyladenine(BA)e7
- Outcome
- PPO activitye7
- Direction
- abolishede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e7“Benzyladenine(BA) completely abolished JA- and ABA-induced PPO activity”
Claim · model-written summary
JA-induced PPO activity is suggested to result from de novo PPO synthesis
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- JAe7
- Outcome
- JA-induced PPO activitye7
- Qualifier
- de novo PPO synthesise7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e7“The results suggest that JA-induced PPO activity is due to de novo PPO synthesis”
Claim · model-written summary
PPO was localized primarily in the outer cortex and xylem parenchyma of tomato stems
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- xylem parenchymae7
- Outcome
- PPOe7
- Qualifier
- localized primarilye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e7“PPO was localized primarily, in the. outer .cortex . and xylem parenchyma”
Claim · model-written summary
Exogenous JA acts as a stress agent and PPO may be a component of the inducible anti-herbivore defence response
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- exogenously applied JAe7
- Outcome
- inducible anti-hervivore defense responsee7
- Qualifier
- PPO may be a componente7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of wounding and jasmonic acid(JA) on polyphenol oxidase(PPO) in tomato(Lycopersicon esculentum Mill.) seedlings were investigated”
e7“exogenously applied JA acts as stress agents and PPO may be a component of the inducible anti-hervivore defense response”
The same questions in other papers
jasmonic acid · physiology: antioxidant enzymes · Solanum lycopersicum (tomato)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
light · physiology: antioxidant enzymes · Solanum lycopersicum (tomato)Positive and negative results
14 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
16 papers more in this group
See all 20 papers →mechanical · physiology: antioxidant enzymes · Solanum lycopersicum (tomato)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.