Abstract
Grapevines rely on arbuscular mycorrhizal fungi (AMF) to obtain ample phosphorus (P) from soils with low to moderate P like the Ultisols of western Oregon. Prior research indicated that nine species, or virtual taxa, of AMF colonized the roots of ‘Pinot noir’ at greater than 1% abundance in a single vineyard. However, little is known about how different taxa within a community vary in their capacity to function as symbionts with grapevines. The effectiveness of five native AMF species representing five genera to promote growth and nutrient uptake of ‘Pinot noir’ was examined in a fumigated Ultisol soil under well-watered and periodically dry conditions. Plants were grown with each of the different isolates alone or without AMF. After 8 and 16 weeks, whole vines were destructively harvested and biomass and nutrients were determined. Results showed that four of the isolates colonized roots extensively, increased root and shoot biomass, and predominantly increased P uptake. A Claroideoglomus isolate was superior in promoting shoot growth as compared with Rhizophagus irregularis , even though both isolates increased P uptake to the same extent, suggesting a higher carbon cost for R. irregularis . Scutellospora calospora failed to colonize roots beyond a trace and had no impact on vine performance. The ability to increase P uptake among the four effective fungi was not related to the frequency of arbuscules in roots suggesting that some P exchange occurs via hyphae within the cortex, particularly for Funneliformis mosseae . Water limitation reduced P uptake as a main effect across all mycorrhizal treatments, suggesting that the native isolates studied here have similar functionality under well-watered and periodically dry conditions.
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Claims 9
Claim · model-written summary
Four fungal isolates extensively colonized grapevine roots.
- Outcome
- colonized roots extensivelye0
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four of the isolates colonized roots extensively”
t0“Young Grapevines”
Claim · model-written summary
Four fungal isolates increased root and shoot biomass.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four of the isolates colonized roots extensively, increased root and shoot biomass”
t0“Young Grapevines”
Claim · model-written summary
Four fungal isolates predominantly increased phosphorus uptake.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four of the isolates colonized roots extensively, increased root and shoot biomass, and predominantly increased P uptake”
t0“Young Grapevines”
Claim · model-written summary
A Claroideoglomus isolate promoted shoot growth more than Rhizophagus irregularis.
- Treatment
- A Claroideoglomus isolatee0
- Interactor
- A Claroideoglomus isolatee0symbiont
- Outcome
- shoot growthe0
- Direction
- superiore0
- Comparator
- Rhizophagus irregularise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A Claroideoglomus isolate was superior in promoting shoot growth as compared with Rhizophagus irregularis”
t0“Young Grapevines”
Claim · model-written summary
The Claroideoglomus and Rhizophagus isolates increased phosphorus uptake equally.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both isolates increased P uptake to the same extent”
t0“Young Grapevines”
Claim · model-written summary
Scutellospora calospora barely colonized grapevine roots.
- Interactor
- Scutellospora calosporaScutellospora calosporae0symbiont
- Outcome
- failed to colonize roots beyond a tracee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scutellospora calospora failed to colonize roots beyond a trace”
t0“Young Grapevines”
Claim · model-written summary
Scutellospora calospora had no impact on vine performance.
- Treatment
- Scutellospora calosporae0
- Interactor
- Scutellospora calosporaScutellospora calosporae0symbiont
- Outcome
- vine performancee0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scutellospora calospora failed to colonize roots beyond a trace and had no impact on vine performance”
t0“Young Grapevines”
Claim · model-written summary
Increased phosphorus uptake was unrelated to arbuscule frequency.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ability to increase P uptake among the four effective fungi was not related to the frequency of arbuscules in roots”
t0“Young Grapevines”
Claim · model-written summary
Water limitation reduced phosphorus uptake across mycorrhizal treatments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water limitation reduced P uptake as a main effect across all mycorrhizal treatments”
t0“Young Grapevines”
The same questions in other papers
drought · nutrient: content · VitisPositive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- 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.