Abstract
During infestation, phloem-feeding insects induce transcriptional reprogramming in plants that may lead to protection. Transcripts of the celery XTH1 gene, encoding a xyloglucan endotransglycosylase/hydrolase (XTH), were previously found to accumulate systemically in celery (Apium graveolens) phloem, following infestation with the generalist aphid Myzus persicae. XTH1 induction was specific to the phloem but was not correlated with an increase in xyloglucan endotransglycosylase (XET) activity in the phloem. XTH1 is homologous to the Arabidopsis thaliana XTH33 gene. XTH33 expression was investigated following M. persicae infestation. The pattern of XTH33 expression is tightly controlled during development and indicates a possible role in cell expansion. An xth33 mutant was assayed for preference assay with M. persicae. Aphids settled preferentially on the mutant rather than on the wild type. This suggests that XTH33 is involved in protecting plants against aphids; therefore, that cell wall modification can alter the preference of aphids for a particular plant. Nevertheless, the ectopic expression of XTH33 in phloem tissue was not sufficient to confer protection, demonstrating that modifying the expression of this single gene does not readily alter plant-aphid interactions.
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Claims 6
Claim · model-written summary
Celery XTH1 transcripts previously accumulated systemically in phloem after Myzus persicae infestation.
- Taxon
- celery
%2C_Elswick%2C_Northumberland_4.jpg?width=60)
Apium graveolens Dulce Groupe0 - Organ / stage
- phloeme0
- Interactor
- Myzus persicae
Myzus persicaee0pest - Gene
- celery XTH1e0
- Outcome
- Transcripts of the celery XTH1 genee0
- Direction
- accumulatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
%2C_Elswick%2C_Northumberland_4.jpg?width=500)
Verbatim
e0“Transcripts of the celery XTH1 gene, encoding a xyloglucan endotransglycosylase/hydrolase (XTH), were previously found to accumulate systemically in celery (Apium graveolens) phloem, following infestation with the generalist aphid Myzus persicae”
Claim · model-written summary
Celery XTH1 induction was specific to phloem.
- Taxon
- celeryApium graveolens Dulce Groupe1
- Organ / stage
- phloeme0
- Gene
- XTH1e0
- Outcome
- XTH1 induction was specific to the phloeme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“XTH1 induction was specific to the phloem”
e1“celery XTH1 gene”
Claim · model-written summary
Celery XTH1 induction was not correlated with increased phloem XET activity.
- Taxon
- celeryApium graveolens Dulce Groupe1
- Organ / stage
- phloeme0
- Gene
- XTH1e0
- Outcome
- xyloglucan endotransglycosylase (XET) activitye0
- Direction
- not correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“XTH1 induction was specific to the phloem but was not correlated with an increase in xyloglucan endotransglycosylase (XET) activity in the phloem”
e1“celery XTH1 gene”
Claim · model-written summary
Arabidopsis XTH33 expression was tightly controlled during development.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae1 - Organ / stage
- developmente0
- Gene
- XTH33e0
- Outcome
- pattern of XTH33 expressione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pattern of XTH33 expression is tightly controlled during development”
e1“Arabidopsis thaliana XTH33 gene”
Claim · model-written summary
Myzus persicae aphids preferred Arabidopsis xth33 mutants over wild type.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Material
- xth33 mutante0
- Interactor
- M. persicaeMyzus persicaee0pest
- Outcome
- Aphids settlede0
- Direction
- preferentiallye0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An xth33 mutant was assayed for preference assay with M. persicae. Aphids settled preferentially on the mutant rather than on the wild type”
e1“Arabidopsis thaliana XTH33 gene”
Claim · model-written summary
Ectopic XTH33 expression in phloem was insufficient to protect plants from aphids.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Organ / stage
- phloem tissuee0
- Treatment
- ectopic expression of XTH33e0
- Interactor
- aphidsAphidomorphae2pest
- Gene
- XTH33e0
- Outcome
- protectione0
- Direction
- not sufficiente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ectopic expression of XTH33 in phloem tissue was not sufficient to confer protection”
e1“Arabidopsis thaliana XTH33 gene”
e2“against aphids”