Abstract
Abstract Phenylpropanoid pathway enzymes are involved in plant defence pathways leading to lignification, synthesis of secondary metabolites, such as salicylic acid and phytoalexins, wound healing and the oxidative burst. Endophytic non-pathogenic Fusarium oxysporum isolate V5w2 has been reported to show antagonistic effects against Radopholus similis in the screenhouse. An experiment was designed to study root biochemical changes (PAL, POX and PPO activities) and R. similis numbers in susceptible and tolerant bananas following inoculation with isolate V5w2. Constitutive expression of PAL and PPO were similar between the susceptible and tolerant cultivars, while constitutive POX activity was higher in the tolerant cultivar. PAL activity was suppressed in both cultivars 7 days after endophyte inoculation (7 dai), but was significantly up-regulated in the susceptible cv. Nabusa at 30 days post nematode challenge (dpnc) in endophyte-inoculated plants. In the tolerant cultivar, PAL activity was up-regulated in R. similis-challenged plants at 7 and 30 dpnc, irrespective of endophyte inoculation. POX and PPO were transiently up-regulated in cv. Nabusa 7 dai, exceeding levels observed in non-inoculated plants of the same cultivar. POX activity was up-regulated at 7 dpnc in endophyte-inoculated cv. Nabusa plants challenged with R. similis. In the tolerant cultivar, POX and PPO activities were similarly up-regulated in R. similis-challenged plants at 7 dpnc, irrespective of endophyte inoculation. The findings of this study implicate PAL, POX and PPO in banana defence against the root-burrowing nematode R. similis. Our findings further demonstrate the ability of endophytic F. oxysporum isolate V5w2 directly to induce POX and prime PAL in the susceptible cv. Nabusa for greater up-regulation following R. similis challenge.
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Claims 10
Claim · model-written summary
Endophyte inoculation suppressed PAL activity in both banana cultivars 7 days after inoculation.
Not reportedComparator
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e2“PAL activity was suppressed in both cultivars 7 days after endophyte inoculation”
Claim · model-written summary
In the susceptible cv. Nabusa, PAL activity was significantly up-regulated at 30 days post nematode challenge in endophyte-inoculated plants.
- Taxon
- bananase0
- Material
- cv. Nabusae1
- Treatment
- endophyte-inoculated plantse1
- Outcome
- PAL activitye1
- Direction
- up-regulatede1
Not reportedComparator
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e1“PAL activity was suppressed in both cultivars 7 days after endophyte inoculation (7 dai), but was significantly up-regulated in the susceptible cv. Nabusa at 30 days post nematode challenge (dpnc) in endophyte-inoculated plants”
Claim · model-written summary
In the tolerant cultivar, PAL activity was up-regulated in R. similis-challenged plants at 7 and 30 days post nematode challenge, irrespective of endophyte inoculation.
- Taxon
- bananase0
- Material
- tolerant cultivare3
- Treatment
- R. similis-challenged plantse3
- Interactor
- R. similis
Radopholus similise3pest - Outcome
- PAL activitye3
- Direction
- up-regulatede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e3“In the tolerant cultivar, PAL activity was up-regulated in R. similis-challenged plants at 7 and 30 dpnc, irrespective of endophyte inoculation”
Claim · model-written summary
Endophyte inoculation transiently up-regulated POX and PPO in cv. Nabusa 7 days after inoculation, above non-inoculated plants.
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e2“PAL activity was suppressed in both cultivars 7 days after endophyte inoculation”
e4“POX and PPO were transiently up-regulated in cv. Nabusa 7 dai, exceeding levels observed in non-inoculated plants of the same cultivar”
Claim · model-written summary
In endophyte-inoculated cv. Nabusa challenged with R. similis, POX activity was up-regulated at 7 days post nematode challenge.
- Taxon
- bananase0
- Material
- cv. Nabusae5
- Treatment
- endophyte-inoculatede5
- Interactor
- R. similisRadopholus similise5pest
- Outcome
- POX activitye5
- Direction
- up-regulatede5
- Qualifier
- at 7 dpnce5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e5“POX activity was up-regulated at 7 dpnc in endophyte-inoculated cv. Nabusa plants challenged with R. similis”
Claim · model-written summary
In the tolerant cultivar, POX and PPO activities were similarly up-regulated in R. similis-challenged plants at 7 days post nematode challenge, irrespective of endophyte inoculation.
- Taxon
- bananase0
- Material
- tolerant cultivare6
- Treatment
- R. similis-challenged plantse6
- Interactor
- R. similisRadopholus similise6pest
- Outcome
- POX and PPO activitiese6
- Direction
- similarly up-regulatede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e6“In the tolerant cultivar, POX and PPO activities were similarly up-regulated in R. similis-challenged plants at 7 dpnc, irrespective of endophyte inoculation”
Claim · model-written summary
Constitutive POX activity was higher in the tolerant banana cultivar than in the susceptible one.
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e1“Constitutive expression of PAL and PPO were similar between the susceptible and tolerant cultivars, while constitutive POX activity was higher in the tolerant cultivar”
Claim · model-written summary
Constitutive PAL and PPO expression was similar between the susceptible and tolerant banana cultivars.
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e1“Constitutive expression of PAL and PPO were similar between the susceptible and tolerant cultivars, while constitutive POX activity was higher in the tolerant cultivar”
Claim · model-written summary
PAL, POX and PPO are implicated in banana defence against the root-burrowing nematode R. similis.
- Taxon
- bananase0
- Interactor
- R. similisRadopholus similise7pest
- Gene
- PAL, POX and PPOe7
- Outcome
- banana defence against the root-burrowing nematode R. similise7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e7“The findings of this study implicate PAL, POX and PPO in banana defence against the root-burrowing nematode R. similis”
Claim · model-written summary
Endophytic F. oxysporum isolate V5w2 directly induced POX and primed PAL in susceptible cv. Nabusa for greater up-regulation after R. similis challenge.
- Taxon
- bananase0
- Material
- cv. Nabusae1
- Treatment
- endophytic F. oxysporum isolate V5w2e1
- Interactor
- F. oxysporum isolate V5w2
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=60)
Fusarium oxysporume1symbiont - Outcome
- POXe1
- Direction
- inducee1
- Qualifier
- prime PALe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=500)
Verbatim
e0“in susceptible and tolerant bananas following inoculation with isolate V5w2”
e1“Our findings further demonstrate the ability of endophytic F. oxysporum isolate V5w2 directly to induce POX and prime PAL in the susceptible cv. Nabusa for greater up-regulation following R. similis challenge”
The same questions in other papers
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- negative
- no effect
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See all 12 papers →inoculation · Radopholus similis · MusaPositive and negative results
8 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- positive
- positive
8 papers more in this group
See all 12 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.