Abstract
ABSTRACT Ethylene, a gaseous plant hormone, plays an important role in plant organ abscission. Both genetic and biochemical evidence suggest that the response of plants to ethylene is mediated by a specific ethylene receptor. It has been documented that calcium as a second signal is involved in the ethylene-mediated response. However, the mechanism of how calcium (Ca) is associated with ethylene induced abscission on ethylene induced abscission is still unknown. We have investigated calcium concentration, activities of degrading enzymes and PG expressions during ethylene induced abscission of tomato pedicel explants with different calcium treatment. The dates showed that direct application of calcium on explants under ethylene would accelerate abscission. Moreover, cellulase activity, endo-PG activity, and TAPGs mRNA expressions were elevated in explants with calcium treatment. Blocking calcium fluxes with chelators ethylene glycol-bis-(2-aminoethyl)-N,N,N′,N′-tetraacetic acid (EGTA) or inhibited calmodulin by TFP delayed ethylene induced abscission. Explants incubated in EGTA showed 8% reduction in extractable free calcium of their abscission zone and exhibited a delayed abscission reaction to ethylene. This effect, similar to the ethylene-promoted pathogenesis response and “triple response”, were found to be calcium dependent. The results indicated that calcium is necessary for the ethylene induced fast abscission. Keywords: abscissionethylenecalcium ACKNOWLEDGMENTS This work was supported by National Natural Science Foundation of China (project 30571265).
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Claims 7
Claim · model-written summary
Calcium application accelerated ethylene-induced abscission of tomato pedicel explants.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- direct application of calciume0
- Outcome
- abscissione0
- Direction
- acceleratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“direct application of calcium on explants under ethylene would accelerate abscission”
e1“tomato pedicel explants”
Claim · model-written summary
Calcium treatment elevated cellulase activity, endo-PG activity, and TAPGs mRNA expression in tomato explants.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- calcium treatmente0
- Outcome
- cellulase activity, endo-PG activity, and TAPGs mRNA expressionse0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cellulase activity, endo-PG activity, and TAPGs mRNA expressions were elevated in explants with calcium treatment”
e1“tomato pedicel explants”
Claim · model-written summary
EGTA delayed ethylene-induced abscission of tomato explants.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- ethylene glycol-bis-(2-aminoethyl)-N,N,N′,N′-tetraacetic acid (EGTA)e0
- Outcome
- ethylene induced abscissione0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Blocking calcium fluxes with chelators ethylene glycol-bis-(2-aminoethyl)-N,N,N′,N′-tetraacetic acid (EGTA) or inhibited calmodulin by TFP delayed ethylene induced abscission”
e1“tomato pedicel explants”
Claim · model-written summary
TFP delayed ethylene-induced abscission of tomato explants.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- TFPe0
- Outcome
- ethylene induced abscissione0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibited calmodulin by TFP delayed ethylene induced abscission”
e1“tomato pedicel explants”
Claim · model-written summary
EGTA incubation reduced extractable free calcium in tomato explant abscission zones by 8%.
- Taxon
- tomatoSolanum lycopersicume1
- Organ / stage
- abscission zonee0
- Treatment
- EGTAe0
- Outcome
- extractable free calciume0
- Direction
- reductione0
- Value
- 8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Explants incubated in EGTA showed 8% reduction in extractable free calcium of their abscission zone”
e1“tomato pedicel explants”
Claim · model-written summary
EGTA-incubated tomato explants had a delayed abscission reaction to ethylene.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- EGTAe0
- Outcome
- abscission reaction to ethylenee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Explants incubated in EGTA showed 8% reduction in extractable free calcium of their abscission zone and exhibited a delayed abscission reaction to ethylene”
e1“tomato pedicel explants”
Claim · model-written summary
Calcium is necessary for rapid ethylene-induced abscission of tomato explants.
- Taxon
- tomatoSolanum lycopersicume1
- Compound
- calciume0
- Outcome
- ethylene induced fast abscissione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“calcium is necessary for the ethylene induced fast abscission”
e1“tomato pedicel explants”
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