Abstract
Rice production suffers a major setback through weed pressure world wide. In the present study, exogenous ap- plication of elicitor compound methyl salicylate (MeSA), at different concentration, (0.1, 0.2, 0.3mM MeSA) was made as a foliar spray and its effect on allelopathic potential of rice genotypes was assessed. The experiment was conducted in a split-plot design with the weedy and weed-free treatments in the main plot and three genotypes as the sub-plot treatment with the foliar application of MeSA.Methyl jasmonate (MeJA) and methyl salicylate (MeSA) are important signaling mol- ecules that induce plant defense against insect herbivores and microbial pathogens. We tested the hypothesis that allelopathy is an inducible defense mechanism, and that the MeSA signaling pathways may activate allelochemicals release. MeSA was found to improve the competitive ability of the genotypes by suppressing weed biomass through enhancements in phenolic acid content (viz. caffeic, o-coumaric and syringic acid) and also in plant growth without any detrimental effect on the host plant, showing that application of MeSA resulted in enhancement of phytotoxic potential of rice genotypes. Spraying of rice plants with 0.2 mM MeSA resulted in highest inhibition of weed dry weight in all the genotypes. Application of MeSA increased also increases Shoot dry matter, grain yield, as well as PAL activity. These results suggest that allelopathy may be an active defense mechanism, and that plant signaling compounds are potentially valuable in its regulation.
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Claims 6
Claim · model-written summary
Foliar spraying of rice with 0.2 mM MeSA gave the highest inhibition of weed dry weight across all genotypes.
- Taxon
- rice
Oryza sativae1 - Treatment
- Spraying of rice plants with 0.2 mM MeSAe1
- Interactor
- weede1weed
- Outcome
- weed dry weighte1
- Direction
- highest inhibitione1
- Qualifier
- in all the genotypese1
- Comparator
- different concentratione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Spraying of rice plants with 0.2 mM MeSA resulted in highest inhibition of weed dry weight in all the genotypes”
e2“exogenous ap- plication of elicitor compound methyl salicylate (MeSA), at different concentration, (0.1, 0.2, 0.3mM MeSA) was made as a foliar spray”
Claim · model-written summary
MeSA application increased phenolic acid content (caffeic, o-coumaric and syringic acid) in rice genotypes.
- Taxon
- riceOryza sativae1
- Treatment
- elicitor compound methyl salicylate (MeSA)e2
- Outcome
- phenolic acid content (viz. caffeic, o-coumaric and syringic acid)e3
- Direction
- enhancementse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“MeSA was found to improve the competitive ability of the genotypes by suppressing weed biomass through enhancements in phenolic acid content (viz. caffeic, o-coumaric and syringic acid)”
e2“exogenous ap- plication of elicitor compound methyl salicylate (MeSA), at different concentration, (0.1, 0.2, 0.3mM MeSA) was made as a foliar spray”
e1“Spraying of rice plants with 0.2 mM MeSA resulted in highest inhibition of weed dry weight in all the genotypes”
Claim · model-written summary
MeSA application increased shoot dry matter and grain yield of rice.
- Taxon
- riceOryza sativae1
- Treatment
- Application of MeSAe4
- Outcome
- Shoot dry matter, grain yielde4
- Direction
- increasese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of MeSA increased also increases Shoot dry matter, grain yield, as well as PAL activity”
e1“Spraying of rice plants with 0.2 mM MeSA resulted in highest inhibition of weed dry weight in all the genotypes”
Claim · model-written summary
MeSA application increased PAL activity in rice.
- Taxon
- riceOryza sativae1
- Treatment
- Application of MeSAe4
- Outcome
- PAL activitye4
- Direction
- increasese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of MeSA increased also increases Shoot dry matter, grain yield, as well as PAL activity”
e1“Spraying of rice plants with 0.2 mM MeSA resulted in highest inhibition of weed dry weight in all the genotypes”
Claim · model-written summary
MeSA application did not detrimentally affect rice plant growth.
- Taxon
- riceOryza sativae1
- Treatment
- elicitor compound methyl salicylate (MeSA)e2
- Outcome
- detrimental effect on the host plante5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“and also in plant growth without any detrimental effect on the host plant”
e2“exogenous ap- plication of elicitor compound methyl salicylate (MeSA), at different concentration, (0.1, 0.2, 0.3mM MeSA) was made as a foliar spray”
e1“Spraying of rice plants with 0.2 mM MeSA resulted in highest inhibition of weed dry weight in all the genotypes”
Claim · model-written summary
Allelopathy may be an active defense mechanism in rice, and plant signaling compounds may be valuable in regulating it.
- Taxon
- riceOryza sativae1
- Treatment
- plant signaling compoundse6
- Outcome
- allelopathye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“These results suggest that allelopathy may be an active defense mechanism, and that plant signaling compounds are potentially valuable in its regulation”
e1“Spraying of rice plants with 0.2 mM MeSA resulted in highest inhibition of weed dry weight in all the genotypes”
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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.