Abstract
Abstract Exogenous application of methyl jasmonate (MeJA) can induce anatomical and chemical changes that are components of defence responses in plants. Particularly, MeJA is well‐known to increase leaf trichome density to protect against insect herbivory, but surprisingly little is known about the effects of MeJA on other leaf properties and plant growth. Using sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max ) treated with 0.0, 0.1, 0.5, 1.0, and 2.5 mM MeJA, we examined changes in leaf trichome density, stomatal density, cuticle thickness, cuticle composition, plant height, and biomass production. For all three plant species, MeJA (especially at the higher concentrations) caused significant decreases in plant height (up to 39%) and biomass (up to 79%). MeJA caused substantial increases in leaf trichome density (being 1.3–3.5‐times higher) in all three species, with the magnitude of these effects increasing with MeJA concentration. However, we also observed that MeJA resulted in significant changes in cuticle composition and thickness, and stomatal density, although the magnitude of these changes was smaller relative to changes in trichome density. Specifically, high concentrations of MeJA increased the relative content of phenolic compounds and cutin in leaf cuticle while decreasing the relative content of polysaccharide. The changes in stomatal density varied with plant species and MeJA concentration. Also, MeJA increased cuticle thickness in tomato but decreased that in sunflower and soybean. Thus, studies investigating MeJA should also consider the importance of changes in other leaf properties and plant growth.
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Claims 10
Claim · model-written summary
MeJA, especially at higher concentrations, significantly decreased plant height by up to 39% in sunflower, tomato and soybean.
- Taxon
- sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )
Glycine max
Solanum lycopersicum
Helianthus annuuse0 - Treatment
- MeJAe1
- Outcome
- plant heighte1
- Direction
- decreasese1
- Value
- up to 39%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )”
e1“MeJA (especially at the higher concentrations) caused significant decreases in plant height (up to 39%)”
Claim · model-written summary
MeJA, especially at higher concentrations, significantly decreased biomass by up to 79% in sunflower, tomato and soybean.
- Taxon
- sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )Glycine maxSolanum lycopersicumHelianthus annuuse0
- Treatment
- MeJAe1
- Outcome
- biomasse1
- Direction
- decreasese1
- Value
- up to 79%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )”
e1“MeJA (especially at the higher concentrations) caused significant decreases in plant height (up to 39%) and biomass (up to 79%)”
Claim · model-written summary
MeJA substantially increased leaf trichome density 1.3 to 3.5 times in all three species, with larger effects at higher MeJA concentration.
- Taxon
- sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )Glycine maxSolanum lycopersicumHelianthus annuuse0
- Treatment
- MeJAe1
- Outcome
- leaf trichome densitye1
- Direction
- increasese1
- Value
- 1.3–3.5‐times highere1
- Qualifier
- with the magnitude of these effects increasing with MeJA concentratione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )”
e1“MeJA caused substantial increases in leaf trichome density (being 1.3–3.5‐times higher) in all three species, with the magnitude of these effects increasing with MeJA concentration”
Claim · model-written summary
MeJA significantly changed cuticle composition and thickness and stomatal density, though less than trichome density.
- Taxon
- sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )Glycine maxSolanum lycopersicumHelianthus annuuse0
- Treatment
- MeJAe1
- Outcome
- cuticle composition and thickness, and stomatal densitye1
- Qualifier
- magnitude of these changes was smaller relative to changes in trichome densitye1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )”
e1“MeJA resulted in significant changes in cuticle composition and thickness, and stomatal density, although the magnitude of these changes was smaller relative to changes in trichome density”
Claim · model-written summary
High concentrations of MeJA increased the relative content of phenolic compounds and cutin in leaf cuticle.
- Taxon
- sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )Glycine maxSolanum lycopersicumHelianthus annuuse0
- Organ / stage
- leaf cuticlee1
- Treatment
- high concentrations of MeJAe1
- Outcome
- relative content of phenolic compounds and cutin in leaf cuticlee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )”
e1“high concentrations of MeJA increased the relative content of phenolic compounds and cutin in leaf cuticle”
Claim · model-written summary
High concentrations of MeJA decreased the relative content of polysaccharide in leaf cuticle.
- Taxon
- sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )Glycine maxSolanum lycopersicumHelianthus annuuse0
- Treatment
- high concentrations of MeJAe1
- Outcome
- relative content of polysaccharidee2
- Direction
- decreasinge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )”
e1“high concentrations of MeJA”
e2“decreasing the relative content of polysaccharide”
Claim · model-written summary
The changes in stomatal density caused by MeJA varied with plant species and MeJA concentration.
- Taxon
- sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )Glycine maxSolanum lycopersicumHelianthus annuuse0
- Treatment
- MeJA concentratione1
- Outcome
- changes in stomatal densitye1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower ( Helianthus annuus ), tomato ( Solanum lycopersicum ), and soybean ( Glycine max )”
e1“The changes in stomatal density varied with plant species and MeJA concentration”
Claim · model-written summary
MeJA increased cuticle thickness in tomato.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- MeJAe1
- Outcome
- cuticle thicknesse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“MeJA increased cuticle thickness in tomato but decreased that in sunflower and soybean”
Claim · model-written summary
MeJA decreased cuticle thickness in sunflower and soybean.
- Taxon
- sunflower and soybeanGlycine maxHelianthus annuuse1
- Treatment
- MeJAe1
- Outcome
- cuticle thicknesse1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“MeJA increased cuticle thickness in tomato but decreased that in sunflower and soybean”
Claim · model-written summary
Studies investigating MeJA should also consider changes in other leaf properties and plant growth.
- Outcome
- changes in other leaf properties and plant growthe1
Not reportedTaxon
Verbatim
e1“studies investigating MeJA should also consider the importance of changes in other leaf properties and plant growth”
The same questions in other papers
(-)-methyl jasmonate · growth · Helianthus annuus (common sunflower)Positive and negative results
2 in the opposite direction
- positive
- positive
(-)-methyl jasmonate · growth · Solanum lycopersicum (tomato)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →(-)-methyl jasmonate · growth · Glycine max (soybean)Results agree
3 papers in the same direction as this paper
- negative
- negative
- no effect
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.