Abstract
Jasmonic acid (JA) has been shown to be a signaling compound which elicits the production of secondary metabolites including phytoalexins in plants. It has been shown that the phytoalexin production is elicited by exogenously applied JA in rice leaves. We now show that this phytoalexin production by exogenously applied JA is significantly counteracted by cytokinins, kinetin and zeatin. Kinetin and zeatin also inhibit the induction of naringenin-7-O-methyltransferase (a key enzyme in rice phytoalexin production) by JA. A natural free radical scavenger, ascorbic acid (AsA) shows both counteractive and enhancing effects on JA-inducible phytoalexin production, depending on its concentration. This effect of AsA suggests that active oxygen species (AOS) may play important roles in phytoalexin production by JA in rice leaves.
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Claims 8
Claim · model-written summary
Exogenous JA elicited rice leaf phytoalexin production.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- leavese0
- Treatment
- exogenously applied JAe0
- Outcome
- phytoalexin productione0
- Direction
- elicitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It has been shown that the phytoalexin production is elicited by exogenously applied JA in rice leaves.”
Claim · model-written summary
kinetin counteracted JA-induced rice phytoalexin production.
- Taxon
- riceOryza sativat0
- Treatment
- kinetine0
- Outcome
- phytoalexin productione0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We now show that this phytoalexin production by exogenously applied JA is significantly counteracted by cytokinins, kinetin and zeatin.”
t0“rice”
Claim · model-written summary
zeatin counteracted JA-induced rice phytoalexin production.
- Taxon
- riceOryza sativat0
- Treatment
- zeatine0
- Outcome
- phytoalexin productione0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We now show that this phytoalexin production by exogenously applied JA is significantly counteracted by cytokinins, kinetin and zeatin.”
t0“rice”
Claim · model-written summary
Kinetin inhibited JA induction of naringenin-7-O-methyltransferase.
- Taxon
- riceOryza sativae0
- Treatment
- Kinetine0
- Gene
- naringenin-7-O-methyltransferasee0
- Outcome
- induction of naringenin-7-O-methyltransferasee0
- Direction
- inhibite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin and zeatin also inhibit the induction of naringenin-7-O-methyltransferase (a key enzyme in rice phytoalexin production) by JA.”
Claim · model-written summary
zeatin inhibited JA induction of naringenin-7-O-methyltransferase.
- Taxon
- riceOryza sativae0
- Treatment
- zeatine0
- Gene
- naringenin-7-O-methyltransferasee0
- Outcome
- induction of naringenin-7-O-methyltransferasee0
- Direction
- inhibite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin and zeatin also inhibit the induction of naringenin-7-O-methyltransferase (a key enzyme in rice phytoalexin production) by JA.”
Claim · model-written summary
Ascorbic acid counteracted JA-induced phytoalexin production at some concentrations.
- Taxon
- riceOryza sativat0
- Treatment
- ascorbic acid (AsA)e0
- Outcome
- JA-inducible phytoalexin productione0
- Direction
- counteractivee0
- Qualifier
- depending on its concentratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A natural free radical scavenger, ascorbic acid (AsA) shows both counteractive and enhancing effects on JA-inducible phytoalexin production, depending on its concentration.”
t0“rice”
Claim · model-written summary
Ascorbic acid enhanced JA-induced phytoalexin production at other concentrations.
- Taxon
- riceOryza sativat0
- Treatment
- ascorbic acid (AsA)e0
- Outcome
- JA-inducible phytoalexin productione0
- Direction
- enhancinge0
- Qualifier
- depending on its concentratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A natural free radical scavenger, ascorbic acid (AsA) shows both counteractive and enhancing effects on JA-inducible phytoalexin production, depending on its concentration.”
t0“rice”
Claim · model-written summary
Active oxygen species may contribute to JA-induced phytoalexin production in rice leaves.
- Taxon
- riceOryza sativae0
- Compound
- active oxygen species (AOS)e0
- Outcome
- phytoalexin production by JAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect of AsA suggests that active oxygen species (AOS) may play important roles in phytoalexin production by JA in rice leaves.”
The same questions in other papers
kinetin · yield · Oryza sativa (rice)Results differ
1 paper in the same direction as this paper · 24 in the opposite direction
- positive
- positive
- positive
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See all 26 papers →zeatin · yield · Oryza sativa (rice)Positive and negative results
3 in the opposite direction
- positive
- positive
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kinetin · molecular: expression · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- no effect
- positive
- positive
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See all 11 papers →L-ascorbic acid · yield · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
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ascorbic acid · yield · Oryza sativa (rice)Results agree
8 papers in the same direction as this paper
- positive
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See all 9 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.