Abstract
SUMMARY Cowpea [ Vigna unguiculata (L.) Walp.] plants were grown in a split‐root system using a calcined montmorillonite clay (Turface) as the growth medium. At transplanting, either the vesicular‐arbuscular mycorrhizal (VAM) fungus Glomus macrocarpum Tul. & Tul. and 100 mg hydroxyapatite (HAP) or 100, 200 or 400 mg HAP kg −1 without the VAM fungus were mixed into side 1 of the split‐root system. Side 2 received only 100 mg HAP kg −1 . After 30 d, a combined inoculum of four Rhizobium isolates (TAL169, TAL173, TAL658 and IRC256) was applied to the surface of all pots. At harvest (60 d), root systems were separated from shoots, and nodule activity (acetylene reduction), plant dry weight, nitrogen (N) and phosphate (P) content and the percentage of VAM colonization were determined. There was no significant effect of treatment on either the N or P content of leaves or roots. The VAM fungus, however, significantly ( P < 0.01) increased shoot dry weight. Root dry weight and nodule activity were significantly increased only on the VAM side of the split‐root system. Rhizobia from 30 nodules per half‐root system were identified using fluorescent antibody techniques. Strain TAL 173 was detected from 95% of the nodules and neither the VAM fungus nor P application affected competitive interaction by rhizobia for nodulation sites. Our work suggests the existence of a localized, non‐systemic, non‐P‐mediated influence of a VAM fungus on root dry weight and nodule activity in cowpea.
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Claims 7
Claim · model-written summary
The treatments had no significant effect on cowpea leaf and root N or P content.
- Taxon
- COWPEA
Vigna unguiculatat0 - Treatment
- treatmente0
- Outcome
- N or P content of leaves or rootse0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant effect of treatment on either the N or P content of leaves or roots.”
t0“COWPEA”
Claim · model-written summary
VAM fungus significantly increased cowpea shoot dry weight.
- Taxon
- COWPEAVigna unguiculatat0
- Treatment
- VAM funguse0
- Interactor
- VAM funguse0symbiont
- Outcome
- shoot dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The VAM fungus, however, significantly ( P < 0.01) increased shoot dry weight.”
t0“COWPEA RHIZOBIA DUE TO PRE‐ESTABLISHMENT OF VESICULAR‐ARBUSCULAR MYCORRHIZA”
Claim · model-written summary
Cowpea root dry weight and nodule activity increased significantly only on the VAM side.
- Taxon
- COWPEAVigna unguiculatat0
- Treatment
- VAM sidee0
- Outcome
- Root dry weight and nodule activitye0
- Direction
- increasede0
- Qualifier
- only on the VAM side of the split‐root systeme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root dry weight and nodule activity were significantly increased only on the VAM side of the split‐root system.”
t0“COWPEA”
Claim · model-written summary
Rhizobium strain TAL 173 occurred in 95% of cowpea nodules.
- Taxon
- COWPEAVigna unguiculatat0
- Interactor
- Strain TAL 173e0symbiont
- Outcome
- detected from 95% of the nodulese0
- Value
- 95%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain TAL 173 was detected from 95% of the nodules and neither the VAM fungus nor P application affected competitive interaction by rhizobia for nodulation sites.”
t0“COWPEA”
Claim · model-written summary
VAM fungus did not alter rhizobial competition for cowpea nodulation sites.
- Taxon
- COWPEAVigna unguiculatat0
- Treatment
- VAM funguse0
- Interactor
- rhizobiae0symbiont
- Outcome
- competitive interaction by rhizobia for nodulation sitese0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain TAL 173 was detected from 95% of the nodules and neither the VAM fungus nor P application affected competitive interaction by rhizobia for nodulation sites.”
t0“COWPEA”
Claim · model-written summary
P application did not alter rhizobial competition for cowpea nodulation sites.
- Taxon
- COWPEAVigna unguiculatat0
- Treatment
- P applicatione0
- Interactor
- rhizobiae0symbiont
- Outcome
- competitive interaction by rhizobia for nodulation sitese0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain TAL 173 was detected from 95% of the nodules and neither the VAM fungus nor P application affected competitive interaction by rhizobia for nodulation sites.”
t0“COWPEA”
Claim · model-written summary
The authors infer a localized, non-systemic, non-P-mediated VAM fungal influence on cowpea root dry weight and nodule activity.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- VAM funguse0
- Outcome
- root dry weight and nodule activitye0
- Qualifier
- localized, non‐systemic, non‐P‐mediatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our work suggests the existence of a localized, non‐systemic, non‐P‐mediated influence of a VAM fungus on root dry weight and nodule activity in cowpea.”
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See all 12 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.