Abstract
When applied exogenously to plants, jasmonates [i.e., jasmonic acid (JA) and methyl jasmonate (MeJA)] increase plant resistance against herbivores, and their use in pest management has been suggested. For integration into pest management programs, the benefits of the resistance induced by jasmonates must outweigh the costs of jasmonates on plant growth and yield. A previous field study in rice found that seed treatment with MeJA reduced densities of the rice water weevil, Lissorhoptrus oryzophilus, but also reduced plant growth. Yields from MeJA plots were similar to yields from control plots. Because this study was conducted under field conditions with natural levels of pest populations, it was unclear whether effects on growth and yield were due to direct effects of MeJA treatment on the plant or due to lower reductions in rice water weevil densities. Therefore, the present study was designed to characterize the effects of JA and MeJA seed treatment on rice plant growth and yield in a pest-free environment under greenhouse conditions. Seed treatment with 2.5 mM JA and 2.5 mM MeJA enhanced resistance in rice plants to rice water weevils when plants were exposed to weevils 30 days after planting. Seed treatment with MeJA reduced seedling emergence and plant height at 4 and 14 days after planting, respectively, compared to JA and control treatments. However, numbers of tillers per plant at 45 days after planting and days to heading were unaffected by jasmonate seed treatment. Of four yield components (panicles per plant, filled grains per panicle, percent unfilled grains, and filled grain mass) that were measured, only filled grain mass was reduced by seed treatment. Plants grown from MeJA-treated seeds showed 31% lower grain masses compared to plants grown from control-treated seeds. Thus, the effects of seed treatment with MeJA on plant growth were stronger immediately post-treatment and subsided over time, such that plant growth mostly recovered 6 weeks after treatment. At maturity, MeJA may reduce one but not all components of yield. Despite similar effects on rice water weevil resistance, the negative effects of JA seed treatment on plant growth and yield were smaller compared to MeJA seed treatment.
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Claims 10
Claim · model-written summary
JA seed treatment enhanced rice resistance to rice water weevils at 30 days.
- Taxon
- rice
Oryza sativae0 - Treatment
- 2.5 mM JAe0
- Interactor
- rice water weevils
Lissorhoptrus oryzophiluse0pest - Outcome
- resistancee0
- Direction
- enhancede0
- Qualifier
- 30 days after plantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed treatment with 2.5 mM JA and 2.5 mM MeJA enhanced resistance in rice plants to rice water weevils when plants were exposed to weevils 30 days after planting”
Claim · model-written summary
MeJA seed treatment enhanced rice resistance to rice water weevils at 30 days.
- Taxon
- riceOryza sativae0
- Treatment
- 2.5 mM MeJAe0
- Interactor
- rice water weevilsLissorhoptrus oryzophiluse0pest
- Outcome
- resistancee0
- Direction
- enhancede0
- Qualifier
- 30 days after plantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed treatment with 2.5 mM JA and 2.5 mM MeJA enhanced resistance in rice plants to rice water weevils when plants were exposed to weevils 30 days after planting”
Claim · model-written summary
MeJA seed treatment reduced rice seedling emergence versus JA and control treatments.
- Treatment
- MeJAe0
- Outcome
- seedling emergencee0
- Direction
- reducede0
- Qualifier
- 4 and 14 days after plantinge0
- Comparator
- JA and control treatmentse0
Not reportedTaxon
Verbatim
e0“Seed treatment with MeJA reduced seedling emergence and plant height at 4 and 14 days after planting, respectively, compared to JA and control treatments”
Claim · model-written summary
MeJA seed treatment reduced rice plant height versus JA and control treatments.
Not reportedTaxon
Verbatim
e0“Seed treatment with MeJA reduced seedling emergence and plant height at 4 and 14 days after planting, respectively, compared to JA and control treatments”
Claim · model-written summary
Jasmonate seed treatment did not affect tiller number at 45 days.
- Treatment
- jasmonate seed treatmente0
- Outcome
- numbers of tillers per plante0
- Direction
- unaffectede0
- Qualifier
- 45 days after plantinge0
Not reportedTaxon
Verbatim
e0“numbers of tillers per plant at 45 days after planting and days to heading were unaffected by jasmonate seed treatment”
Claim · model-written summary
Jasmonate seed treatment did not affect days to heading.
Not reportedTaxon
Verbatim
e0“numbers of tillers per plant at 45 days after planting and days to heading were unaffected by jasmonate seed treatment”
Claim · model-written summary
MeJA seed treatment reduced filled grain mass by 31% versus control seed treatment.
- Treatment
- MeJA-treated seedse0
- Outcome
- grain massese0
- Direction
- lowere0
- Value
- 31%e0
- Comparator
- control-treated seedse0
Not reportedTaxon
Verbatim
e0“Plants grown from MeJA-treated seeds showed 31% lower grain masses compared to plants grown from control-treated seeds”
Claim · model-written summary
MeJA treatment reduced filled grain mass but not the other measured yield components.
Not reportedTaxon
Verbatim
e0“Of four yield components (panicles per plant, filled grains per panicle, percent unfilled grains, and filled grain mass) that were measured, only filled grain mass was reduced by seed treatment”
Claim · model-written summary
MeJA effects on rice growth subsided by six weeks after treatment.
Not reportedTaxon
Verbatim
e0“plant growth mostly recovered 6 weeks after treatment”
Claim · model-written summary
JA had smaller negative effects on growth and yield than MeJA.
- Treatment
- JA seed treatmente0
- Outcome
- plant growth and yielde0
- Direction
- smallere0
- Comparator
- MeJA seed treatmente0
Not reportedTaxon
Verbatim
e0“the negative effects of JA seed treatment on plant growth and yield were smaller compared to MeJA seed treatment”
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See all 166 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.