Abstract
Abstract When walnut trees were bark-grafted leaving nurse-limbs, xylem exudation was observed at a few slashes made low on the tree but not at graft junctures. Scions grew equally well on trees with slashes (74%) as those without slashes (86%). When the same treatments were made without nurse-limbs, 83% of the scions grew where exudates did not appear but only 21% grew where xylem sap exuded nearby. No dormant patch-bud placed in August-September grew the following spring if the sap flowed from any side of the patch, whereas 96% grew where no exudation occurred. Analysis of the xylem exudate revealed the presence of substances which inhibited growth of walnut calli and cucumber seedlings. A strong zone of inhibition on paper chromatograms coincided with the Rf of juglone, a powerful toxin which was identified by absorption spectrophotometry.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. 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 9
Claim · model-written summary
Bark-grafted walnut trees with nurse limbs exuded xylem sap at lower slashes but not graft junctions.
Verbatim
e0“When walnut trees were bark-grafted leaving nurse-limbs, xylem exudation was observed at a few slashes made low on the tree but not at graft junctures”
Claim · model-written summary
With nurse limbs, scions grew similarly on slashed and unslashed walnut trees, at 74% and 86%.
Verbatim
e0“Scions grew equally well on trees with slashes (74%) as those without slashes (86%)”
t0“Walnuts”
Claim · model-written summary
Without nurse limbs, walnut scions grew in 83% of nonexuding sites.
JuglansOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“83% of the scions grew where exudates did not appear”
t0“Walnuts”
Claim · model-written summary
Without nurse limbs, walnut scions grew in only 21% of sites with nearby xylem exudation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 21% grew where xylem sap exuded nearby”
t0“Walnuts”
e1“the scions grew”
Claim · model-written summary
No dormant walnut patch buds grew after sap flowed from any side of the patch.
- Organ / stage
- dormant patch-bude0
- Outcome
- grew the following springe0
- Direction
- Noe0
- Qualifier
- if the sap flowed from any side of the patche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No dormant patch-bud placed in August-September grew the following spring if the sap flowed from any side of the patch”
t0“Walnuts”
Claim · model-written summary
Where no exudation occurred, 96% of walnut patch buds grew.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“96% grew where no exudation occurred”
t0“Walnuts”
e1“No dormant patch-bud placed in August-September grew”
Claim · model-written summary
Xylem exudate contained substances that inhibited walnut callus growth.
Not reportedComparator
Verbatim
e0“substances which inhibited growth of walnut calli”
e1“Analysis of the xylem exudate revealed the presence of substances”
Claim · model-written summary
Xylem exudate contained substances that inhibited cucumber seedling growth.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- xylem exudatee1
- Outcome
- growth of walnut calli and cucumber seedlingse0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“substances which inhibited growth of walnut calli and cucumber seedlings”
e1“Analysis of the xylem exudate revealed the presence of substances”
Claim · model-written summary
An inhibitory paper chromatogram zone coincided with the Rf of juglone, which spectrophotometry identified.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong zone of inhibition on paper chromatograms coincided with the Rf of juglone, a powerful toxin which was identified by absorption spectrophotometry”
t0“Walnuts”
The same questions in other papers
allelopathy · growth · Cucumis sativus (cucumber)Positive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 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.