Abstract
The impact of root leachates of Lantana camara L., a tropical weed, against Meloidogyne javanica, the root-knot nematode, was tested under laboratory and pot conditions. Concentrated and diluted root leachate caused substantial mortality of M. javanica juveniles. Significant suppression of the nematode was achieved when soil was treated with a full-strength concentration of the leachate. Whilst this high concentration retarded plant height and shoot fresh weight, more diluted concentrations actually enhanced plant growth. To establish whether this inhibition of plant growth from the leachate was the result of depleted nitrogen levels in the soil due to the leachate, soil treated with such leachates was given urea as an additional nitrogen source. Urea not only enhanced nematode suppression activity of the root leachates but also increased seedling emergence and growth of mungbean. Application of the L. camara root leachates in combination with Pseudomonas aeruginosa, a plant growth-promoting rhizobacterium, significantly reduced nematode population densities in roots and subsequent root-knot infection, and enhanced plant growth. While a high concentration of root leachate slightly reduced P. aeruginosa colonization in the rhizosphere and inner root tissues, the nematicidal efficacy of the bacterium was unaffected. The root leachate of L. camara was found to contain phenolic compounds, including p-hydroxybenzoic acid, vanillic acid, caffeic acid, ferulic acid and a quercetin glycoside, 7-glucoside. It also contained weak enzymic hydrogen cyanide.
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Claims 12
Claim · model-written summary
Concentrated root leachate caused substantial juvenile nematode mortality.
- Taxon
- mungbean
.jpg?width=60)
Vigna radiatae1 - Treatment
- Concentratede0
- Interactor
- M. javanicaMeloidogyne javanicae0pathogen
- Outcome
- mortality of M. javanica juvenilese0
- Direction
- substantiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Concentrated and diluted root leachate caused substantial mortality of M. javanica juveniles”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
Diluted root leachate caused substantial juvenile nematode mortality.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- diluted root leachatee0
- Interactor
- M. javanicaMeloidogyne javanicae0pathogen
- Outcome
- mortality of M. javanica juvenilese0
- Direction
- substantiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrated and diluted root leachate caused substantial mortality of M. javanica juveniles”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
Full-strength leachate significantly suppressed the nematode.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- full-strength concentration of the leachatee0
- Interactor
- Meloidogyne javanicaMeloidogyne javanicae2pathogent0
- Outcome
- suppression of the nematodee0
- Direction
- suppressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant suppression of the nematode was achieved when soil was treated with a full-strength concentration of the leachate”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
High leachate concentration retarded plant height and shoot fresh weight.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- high concentratione0
- Outcome
- plant height and shoot fresh weighte0
- Direction
- retardede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this high concentration retarded plant height and shoot fresh weight”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
Diluted leachate enhanced plant growth.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- more diluted concentrationse0
- Outcome
- plant growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more diluted concentrations actually enhanced plant growth”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
Urea enhanced nematode suppression by the root leachates.
- Taxon
- mungbeanVigna radiatae0
- Treatment
- Ureae0
- Interactor
- Meloidogyne javanicaMeloidogyne javanicae2pathogent0
- Outcome
- nematode suppression activity of the root leachatese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea not only enhanced nematode suppression activity of the root leachates but also increased seedling emergence and growth of mungbean”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
Urea increased mungbean seedling emergence and growth.
- Taxon
- mungbeanVigna radiatae0
- Treatment
- Ureae0
- Outcome
- seedling emergence and growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea not only enhanced nematode suppression activity of the root leachates but also increased seedling emergence and growth of mungbean”
Claim · model-written summary
Leachate with Pseudomonas aeruginosa reduced root nematode density and infection.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- L. camara root leachates in combination with Pseudomonas aeruginosae0
- Interactor
- Meloidogyne javanicaMeloidogyne javanicae2pathogent0
- Second interactor
- Pseudomonas aeruginosa
Pseudomonas aeruginosae0symbiont - Outcome
- nematode population densities in roots and subsequent root-knot infectione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of the L. camara root leachates in combination with Pseudomonas aeruginosa, a plant growth-promoting rhizobacterium, significantly reduced nematode population densities in roots and subsequent root-knot infection, and enhanced plant growth”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
Leachate with Pseudomonas aeruginosa enhanced plant growth.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- L. camara root leachates in combination with Pseudomonas aeruginosae0
- Interactor
- Pseudomonas aeruginosaPseudomonas aeruginosae0symbiont
- Outcome
- plant growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of the L. camara root leachates in combination with Pseudomonas aeruginosa, a plant growth-promoting rhizobacterium, significantly reduced nematode population densities in roots and subsequent root-knot infection, and enhanced plant growth”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
High leachate concentration slightly reduced P. aeruginosa colonization.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- high concentration of root leachatee0
- Interactor
- P. aeruginosaPseudomonas aeruginosae0symbiont
- Outcome
- P. aeruginosa colonizatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a high concentration of root leachate slightly reduced P. aeruginosa colonization in the rhizosphere and inner root tissues”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
High leachate concentration did not affect bacterial nematicidal efficacy.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- high concentration of root leachatee0
- Interactor
- Meloidogyne javanicaMeloidogyne javanicae2pathogent0
- Second interactor
- P. aeruginosaPseudomonas aeruginosae0symbiont
- Outcome
- nematicidal efficacy of the bacteriume0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While a high concentration of root leachate slightly reduced P. aeruginosa colonization in the rhizosphere and inner root tissues, the nematicidal efficacy of the bacterium was unaffected”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
Claim · model-written summary
Lantana root leachate contained several phenolic compounds and weak enzymic hydrogen cyanide.
- Taxon
- L. camara
_mit_Insekt.jpg?width=60)
Lantana camarae0 - Outcome
- phenolic compounds, including p-hydroxybenzoic acid, vanillic acid, caffeic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_mit_Insekt.jpg?width=500)
Verbatim
e0“The root leachate of L. camara was found to contain phenolic compounds, including p-hydroxybenzoic acid, vanillic acid, caffeic acid, ferulic acid and a quercetin glycoside, 7-glucoside. It also contained weak enzymic hydrogen cyanide”
e1“seedling emergence and growth of mungbean”
e2“Meloidogyne javanica”
t0“Lantana camara”
The same questions in other papers
Lantana camara · growth · Vigna radiata (mung bean)Positive and negative results
1 paper in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
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Lantana camara · Meloidogyne javanica · Vigna radiata (mung bean)Results agree
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Pseudomonas aeruginosa · growth · Vigna radiata (mung bean)Results agree
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See all 5 papers →nitrogen · growth · Vigna radiata (mung bean)Positive and negative results
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- no effect
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See all 40 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.