Abstract
This work investigated how calcium regulates the ethylene biosynthesis in the fruits of wild-type tomato ( Lycopersicon esculentum L.) and their ethylene receptor never-ripe ( Nr ) mutants. In Nr tomato, the ethylene perception was blocked. When both materials were treated with calcium, the content of 1-aminocyclopropane-1-carboxylic acid (ACC)/malonyl-ACC and the activity of ACC oxidase (ACO) in tomato fruit discs increased, whereas the production of ethylene, content of malondialdehyde, and membrane permeability decreased. Calcium treatment did not affect the activity of ACC synthase, which is the first committed step in the ethylene biosynthesis pathway. The expression of LeACO1 in mature green fruit was inhibited significantly by calcium treatment in wild-type and Nr tomatoes, but the expression of LeACS2 , the key ACC synthase gene in ethylene synthesis during tomato fruit maturing, was not affected. These results revealed that the effect of calcium on ethylene biosynthesis in tomato mature green fruit was independent of ethylene perception. The results also revealed that the targeting step of calcium preventing ethylene production was located at the ACC conversion to ethylene, by means of inhibiting ACC availability for ACO through enhancing cell membrane integrity and by means of preventing LeACO1 gene expression.
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Claims 8
Claim · model-written summary
Calcium treatment increased ACC/MACC content and ACC oxidase activity in tomato fruit discs.
- Taxon
- tomato
Solanum lycopersicume1 - Organ / stage
- tomato fruit discse1
- Treatment
- calciume1
- Outcome
- the content of 1-aminocyclopropane-1-carboxylic acid (ACC)/malonyl-ACC and the activity of ACC oxidase (ACO)e1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“When both materials were treated with calcium, the content of 1-aminocyclopropane-1-carboxylic acid (ACC)/malonyl-ACC and the activity of ACC oxidase (ACO) in tomato fruit discs increased”
Claim · model-written summary
Calcium treatment decreased ethylene production in tomato fruit discs.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- treated with calciume1
- Outcome
- production of ethylenee1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“When both materials were treated with calcium, the content of 1-aminocyclopropane-1-carboxylic acid (ACC)/malonyl-ACC and the activity of ACC oxidase (ACO) in tomato fruit discs increased, whereas the production of ethylene, content of malondialdehyde, and membrane permeability decreased”
Claim · model-written summary
Calcium treatment decreased malondialdehyde content and membrane permeability in tomato fruit discs.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- treated with calciume1
- Outcome
- content of malondialdehyde, and membrane permeabilitye1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“When both materials were treated with calcium, the content of 1-aminocyclopropane-1-carboxylic acid (ACC)/malonyl-ACC and the activity of ACC oxidase (ACO) in tomato fruit discs increased, whereas the production of ethylene, content of malondialdehyde, and membrane permeability decreased”
Claim · model-written summary
Calcium treatment did not affect ACC synthase activity in tomato fruit.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- Calcium treatmente1
- Outcome
- activity of ACC synthasee1
- Direction
- did not affecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Calcium treatment did not affect the activity of ACC synthase, which is the first committed step in the ethylene biosynthesis pathway”
e2“wild-type tomato ( Lycopersicon esculentum L.)”
Claim · model-written summary
Calcium treatment did not affect LeACS2 expression in mature green tomato fruit.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- calcium treatmente2
- Gene
- LeACS2e1
- Outcome
- expression of LeACS2e1
- Direction
- not affectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“but the expression of LeACS2 , the key ACC synthase gene in ethylene synthesis during tomato fruit maturing, was not affected”
e2“calcium treatment in wild-type and Nr tomatoes”
Claim · model-written summary
Calcium treatment inhibited LeACO1 expression in mature green fruit of wild-type and Nr tomato, with a significant effect.
- Taxon
- tomatoesSolanum lycopersicume1
- Organ / stage
- mature green fruite1
- Treatment
- calcium treatmente1
- Gene
- LeACO1e1
- Outcome
- expression of LeACO1e1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of LeACO1 in mature green fruit was inhibited significantly by calcium treatment in wild-type and Nr tomatoes”
Claim · model-written summary
The effect of calcium on ethylene biosynthesis in tomato mature green fruit was independent of ethylene perception.
- Taxon
- tomatoSolanum lycopersicume1
- Organ / stage
- mature green fruite1
- Outcome
- effect of calcium on ethylene biosynthesise1
- Qualifier
- independent of ethylene perceptione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“These results revealed that the effect of calcium on ethylene biosynthesis in tomato mature green fruit was independent of ethylene perception”
Claim · model-written summary
Calcium prevents ethylene production at the ACC-to-ethylene step by inhibiting ACC availability for ACO through enhanced membrane integrity and by preventing LeACO1 expression.
- Taxon
- tomatoSolanum lycopersicume2
- Gene
- LeACO1e1
- Outcome
- ethylene productione1
- Qualifier
- by means of inhibiting ACC availability for ACO through enhancing cell membrane integritye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results also revealed that the targeting step of calcium preventing ethylene production was located at the ACC conversion to ethylene, by means of inhibiting ACC availability for ACO through enhancing cell membrane integrity and by means of preventing LeACO1 gene expression”
e2“tomato mature green fruit”
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- negative
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See all 22 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.