Abstract
Groundsel (Senecio vulgaris L.) was grown in sand culture at a range of nutrient concentrations. Except when nutrient deficiency was severe, infection by the rust fungus Puccinia lagenophorae Cooke substantially reduced root dry weight but had little effect on root length. Thus, specific root length (SRL, cm root mg−1 d. wt) was significantly increased in rust-infected plants. The inhibition of root dry weight caused by rust infection was most pronounced late in development, especially after flowering when, in control plants, root elongation but not dry weight accumulation ceased. In rusted plants, and in all plants subjected to severe nutrient deficiency, dry weight accumulation in the roots ceased concurrently with root elongation. Late in development at high nutrient concentration adventitious roots with low SRLs were produced. However, infection did not modify the production of such roots and increases in SRL could not be attributed to changes in any single type of root. There was an inverse relationship between SRL and root diameter. This relationship was unaffected by rust infection whilst nutrient deficiency changed only its intercept: at a given SRL roots of nutrient stressed plants were thinner than those of plants with adequate nutrient supply. Thus, the smaller diameter of roots of nutrient-stressed plants occurred independently of measured changes in SRL but, in the absence of nutrient stress, the decrease in root diameter caused by rust was closely related to increases in SRL. Changes in the root: length relationships in rusted plants may have important implications for root activity in the field. In view of the reported changes in SRL, inhibition of root growth in terms of dry weight may be a poor indicator of potential changes in activity.
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Claims 16
Claim · model-written summary
Rust infection substantially reduced groundsel root dry weight except under severe nutrient deficiency.
- Taxon
- Groundsel (Senecio vulgaris L.)
_(10171293746).jpg?width=60)
Senecio vulgarise1 - Treatment
- infection by the rust fungus Puccinia lagenophorae Cookee0
- Interactor
- Puccinia lagenophorae Cooke
Puccinia lagenophoraee0pathogen - Outcome
- root dry weighte0
- Direction
- reducede0
- Qualifier
- Except when nutrient deficiency was severee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_(10171293746).jpg?width=500)
Verbatim
e0“Except when nutrient deficiency was severe, infection by the rust fungus Puccinia lagenophorae Cooke substantially reduced root dry weight”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
Rust infection had little effect on groundsel root length except under severe deficiency.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Treatment
- infection by the rust fungus Puccinia lagenophorae Cookee0
- Interactor
- Puccinia lagenophorae CookePuccinia lagenophoraee0pathogen
- Outcome
- root lengthe0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except when nutrient deficiency was severe, infection by the rust fungus Puccinia lagenophorae Cooke substantially reduced root dry weight but had little effect on root length.”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
Rust infection significantly increased specific root length.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Treatment
- rust-infectede0
- Interactor
- Puccinia lagenophorae CookePuccinia lagenophoraee2pathogen
- Outcome
- specific root lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“specific root length (SRL, cm root mg−1 d. wt) was significantly increased in rust-infected plants”
e1“Groundsel (Senecio vulgaris L.)”
e2“Puccinia lagenophorae Cooke”
Claim · model-written summary
Rust inhibition of root dry weight was most pronounced late in development, especially after flowering.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Organ / stage
- after floweringe0
- Interactor
- Puccinia lagenophorae CookePuccinia lagenophoraee2pathogen
- Outcome
- inhibition of root dry weighte0
- Direction
- most pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibition of root dry weight caused by rust infection was most pronounced late in development, especially after flowering”
e1“Groundsel (Senecio vulgaris L.)”
e2“Puccinia lagenophorae Cooke”
Claim · model-written summary
After flowering, control plants stopped root elongation while dry weight accumulation continued.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Outcome
- root elongatione0
- Direction
- ceasede0
- Qualifier
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in control plants, root elongation but not dry weight accumulation ceased”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
In rusted plants, root dry weight accumulation ceased with elongation.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Treatment
- rustede0
- Interactor
- Puccinia lagenophorae CookePuccinia lagenophoraee2pathogen
- Outcome
- dry weight accumulation in the rootse0
- Direction
- ceasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rusted plants, and in all plants subjected to severe nutrient deficiency, dry weight accumulation in the roots ceased concurrently with root elongation.”
e1“Groundsel (Senecio vulgaris L.)”
e2“Puccinia lagenophorae Cooke”
Claim · model-written summary
Under severe nutrient deficiency, root dry weight accumulation ceased with elongation.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Treatment
- severe nutrient deficiencye0
- Outcome
- dry weight accumulation in the rootse0
- Direction
- ceasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all plants subjected to severe nutrient deficiency, dry weight accumulation in the roots ceased concurrently with root elongation”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
At high nutrient concentration late in development, adventitious roots with low SRL were produced.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Organ / stage
- adventitious rootse0
- Outcome
- adventitious roots with low SRLs were producede0
- Qualifier
- high nutrient concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Late in development at high nutrient concentration adventitious roots with low SRLs were produced”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
Rust infection did not modify adventitious root production.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise2
- Organ / stage
- adventitious rootse1
- Treatment
- infectione0
- Interactor
- Puccinia lagenophorae CookePuccinia lagenophoraee3pathogen
- Outcome
- production of such rootse0
- Direction
- did not modifye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infection did not modify the production of such roots”
e1“adventitious roots”
e2“Groundsel (Senecio vulgaris L.)”
e3“Puccinia lagenophorae Cooke”
Claim · model-written summary
SRL increases were not attributable to a single root type.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Outcome
- increases in SRLe0
- Qualifier
- any single type of roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in SRL could not be attributed to changes in any single type of root”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
SRL was inversely related to root diameter.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Organ / stage
- roote0
- Outcome
- root diametere0
- Direction
- inversee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was an inverse relationship between SRL and root diameter.”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
Rust infection did not change the SRL–root diameter relationship.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise2
- Treatment
- rust infectione0
- Interactor
- Puccinia lagenophorae CookePuccinia lagenophoraee3pathogen
- Outcome
- relationship between SRL and root diametere1
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This relationship was unaffected by rust infection”
e1“relationship between SRL and root diameter”
e2“Groundsel (Senecio vulgaris L.)”
e3“Puccinia lagenophorae Cooke”
Claim · model-written summary
Nutrient deficiency changed only the intercept of the SRL–diameter relationship.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise2
- Treatment
- nutrient deficiencye0
- Outcome
- relationship between SRL and root diametere1
- Direction
- changede0
- Qualifier
- only its intercepte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nutrient deficiency changed only its intercept”
e1“relationship between SRL and root diameter”
e2“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
At a given SRL, nutrient-stressed roots were thinner than adequately nourished roots.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Treatment
- nutrient stressede0
- Outcome
- rootse0
- Direction
- thinnere0
- Qualifier
- at a given SRLe0
- Comparator
- plants with adequate nutrient supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at a given SRL roots of nutrient stressed plants were thinner than those of plants with adequate nutrient supply”
e1“Groundsel (Senecio vulgaris L.)”
Claim · model-written summary
Without nutrient stress, rust-related smaller root diameter closely related to increased SRL.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Treatment
- ruste0
- Interactor
- Puccinia lagenophorae CookePuccinia lagenophoraee2pathogen
- Outcome
- root diametere0
- Direction
- decreasee0
- Qualifier
- in the absence of nutrient stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the absence of nutrient stress, the decrease in root diameter caused by rust was closely related to increases in SRL”
e1“Groundsel (Senecio vulgaris L.)”
e2“Puccinia lagenophorae Cooke”
Claim · model-written summary
Authors caution that root dry weight inhibition may poorly indicate potential activity changes.
- Taxon
- Groundsel (Senecio vulgaris L.)Senecio vulgarise1
- Outcome
- poor indicator of potential changes in activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of root growth in terms of dry weight may be a poor indicator of potential changes in activity”
e1“Groundsel (Senecio vulgaris L.)”
The same questions in other papers
infection · Puccinia lagenophorae · Senecio vulgaris (old-man-in-the-Spring)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 papers →infection · growth · Senecio vulgaris (old-man-in-the-Spring)Results agree
1 paper in the same direction as this paper
- negative
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.