Abstract
Coronatine is a polyketide phytotoxin produced by several plant pathogenic Pseudomonas spp. The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined. Coronatine at 200 mg·L -1 significantly reduced fruit detachment force of mature fruit, and did not cause fruitlet or flower loss in `Valencia'. Cumulative leaf loss was 18% with coronatine treatment. Coronafacic acid or coronamic acid, precursors to coronatine in Pseudomonas syringae , did not cause mature fruit abscission. Ethylene production in mature fruit and leaves was stimulated by coronatine treatment, and 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) and 12-oxo-phytodienoate reductase (12-oxo-PDAR) gene expression was upregulated. A slight chlorosis developed in the canopy of whole trees sprayed with coronatine, and chlorophyll content was reduced relative to adjuvant-treated controls. Leaves formed after coronatine application were not chlorotic and had chlorophyll contents similar to controls. Comparison of coronatine to the abscission compounds methyl jasmonate, 5-chloro-3-methyl-4-nitro-pyrazole and ethephon indicated differences in ethylene production and ACO and 12-oxo-PDAR gene expression between treatments. Leaf loss, chlorophyll reduction and low coronatine yield during fermentation must be overcome for coronatine to be seriously considered as an abscission material for citrus.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Coronatine at 200 mg/L significantly reduced fruit detachment force of mature citrus fruit.
- Taxon
- Citrus sinensis
Citrus sinensise0 - Treatment
- Coronatinee1
- Outcome
- fruit detachment force of mature fruite1
- Direction
- reducede1
- Value
- 200 mg·L -1e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e1“Coronatine at 200 mg·L -1 significantly reduced fruit detachment force of mature fruit, and did not cause fruitlet or flower loss in `Valencia'”
Claim · model-written summary
Coronatine did not cause fruitlet or flower loss in Valencia orange.
- Taxon
- Citrus sinensisCitrus sinensise0
- Material
- Valenciae1
- Treatment
- Coronatinee1
- Outcome
- fruitlet or flower losse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e1“Coronatine at 200 mg·L -1 significantly reduced fruit detachment force of mature fruit, and did not cause fruitlet or flower loss in `Valencia'”
Claim · model-written summary
Coronatine treatment caused cumulative leaf loss of 18%.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- coronatine treatmente2
- Outcome
- Cumulative leaf losse2
- Direction
- increaseinferrede2
- Value
- 18%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e2“Cumulative leaf loss was 18% with coronatine treatment”
Claim · model-written summary
Coronatine treatment stimulated ethylene production in mature fruit and leaves.
- Taxon
- Citrus sinensisCitrus sinensise0
- Organ / stage
- mature fruit and leavese4
- Treatment
- coronatine treatmente4
- Outcome
- Ethylene productione4
- Direction
- stimulatede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e4“Ethylene production in mature fruit and leaves was stimulated by coronatine treatment, and 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) and 12-oxo-phytodienoate reductase (12-oxo-PDAR) gene expression was upregulated”
Claim · model-written summary
Coronatine treatment upregulated ACO gene expression in citrus.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- coronatine treatmente4
- Gene
- ACOe4
- Outcome
- gene expressione4
- Direction
- upregulatede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e4“Ethylene production in mature fruit and leaves was stimulated by coronatine treatment, and 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) and 12-oxo-phytodienoate reductase (12-oxo-PDAR) gene expression was upregulated”
Claim · model-written summary
Coronatine treatment upregulated 12-oxo-PDAR gene expression in citrus.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- coronatine treatmente4
- Gene
- 12-oxo-PDARe4
- Outcome
- gene expressione4
- Direction
- upregulatede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e4“Ethylene production in mature fruit and leaves was stimulated by coronatine treatment, and 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) and 12-oxo-phytodienoate reductase (12-oxo-PDAR) gene expression was upregulated”
Claim · model-written summary
Coronatine sprayed on whole trees caused slight chlorosis in the canopy.
- Taxon
- Citrus sinensisCitrus sinensise0
- Organ / stage
- canopye5
- Treatment
- trees sprayed with coronatinee5
- Outcome
- chlorosise5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e5“A slight chlorosis developed in the canopy of whole trees sprayed with coronatine, and chlorophyll content was reduced relative to adjuvant-treated controls”
Claim · model-written summary
Coronatine reduced chlorophyll content relative to adjuvant-treated controls.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- coronatinee5
- Outcome
- chlorophyll contente5
- Direction
- reducede5
- Comparator
- adjuvant-treated controlse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e5“A slight chlorosis developed in the canopy of whole trees sprayed with coronatine, and chlorophyll content was reduced relative to adjuvant-treated controls”
Claim · model-written summary
Leaves formed after coronatine application had chlorophyll contents similar to controls.
- Taxon
- Citrus sinensisCitrus sinensise0
- Organ / stage
- Leavese6
- Treatment
- coronatine applicatione6
- Outcome
- chlorophyll contentse6
- Direction
- similare6
- Comparator
- controlse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e6“Leaves formed after coronatine application were not chlorotic and had chlorophyll contents similar to controls”
Claim · model-written summary
Coronatine differed from methyl jasmonate, 5-chloro-3-methyl-4-nitro-pyrazole and ethephon in ethylene production and ACO and 12-oxo-PDAR gene expression.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- coronatinee7
- Outcome
- ethylene productione7
- Comparator
- methyl jasmonate, 5-chloro-3-methyl-4-nitro-pyrazole and ethephone7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e7“Comparison of coronatine to the abscission compounds methyl jasmonate, 5-chloro-3-methyl-4-nitro-pyrazole and ethephon indicated differences in ethylene production and ACO and 12-oxo-PDAR gene expression between treatments”
Claim · model-written summary
Coronafacic acid and coronamic acid did not cause mature fruit abscission.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Coronafacic acid or coronamic acide3
- Outcome
- mature fruit abscissione3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of coronatine on abscission in Citrus sinensis L. Osbeck `Hamlin' and `Valencia' orange fruit, leaves, fruitlets, and flowers was determined”
e3“Coronafacic acid or coronamic acid, precursors to coronatine in Pseudomonas syringae , did not cause mature fruit abscission”
Claim · model-written summary
Low coronatine yield during fermentation must be overcome before coronatine is considered as a citrus abscission material.
- Outcome
- low coronatine yield during fermentatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Leaf loss, chlorophyll reduction and low coronatine yield during fermentation must be overcome for coronatine to be seriously considered as an abscission material for citrus”
The same questions in other papers
application · physiology: pigments · Citrus sinensis (sweet orange)Positive and negative results
18 in the opposite direction
- positive
- positive
- positive
15 papers more in this group
See all 19 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.