Abstract
The effect of arbuscular mycorrhizas on fructan accumulation was studied in barley ( Hordeum vulgare ) infected with Glomus mosseae . Treatments with and without fertilizer were included in order to distinguish between mere fertilizer effects and the effects of the symbiosis, and plants were harvested at two different time points, 35 and 50 d after planting. Fructan was the major storage carboyhdrate in both leaves and roots. The amounts of fructan were markedly altered in the mycorrhizal plants. In roots of non‐fertilized mycorrhizal plants, fructan pools were significantly greater than in the corresponding non‐mycorrhizal plants. By contrast, fertilization caused a general decrease in amounts of fructan in roots. The increase of fructan in mycorrhizal roots was correlated with a decrease of invertase activity. In leaves, fructan pools decreased or remained unchanged upon mycorrhizal infection; fertilization had a similar effect. However, when individual leaves of a plant were compared, intriguing effects of the mycorrhizal symbiosis could be observed. Whereas in non‐mycorrhizal plants, the youngest leaves had the highest fructan contents and the oldest leaves the lowest (as previously reported), this gradient was markedly altered in mycorrhizal plants, indicating systemic effects of mycorrhiza on assimilate partitioning in shoots.
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Claims 8
Claim · model-written summary
Fructan was the major storage carbohydrate in barley leaves and roots.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Organ / stage
- leaves and rootse0
- Outcome
- Fructan was the major storage carboyhdratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Fructan was the major storage carboyhdrate in both leaves and roots.”
t0“barley”
Claim · model-written summary
Non-fertilized mycorrhizal barley roots had significantly greater fructan pools than non-mycorrhizal roots.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- rootse0
- Treatment
- mycorrhizal plantse0
- Outcome
- fructan poolse0
- Direction
- greatere0
- Qualifier
- non‐fertilizede0
- Comparator
- non‐mycorrhizal plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In roots of non‐fertilized mycorrhizal plants, fructan pools were significantly greater than in the corresponding non‐mycorrhizal plants.”
t0“barley”
Claim · model-written summary
Fertilization generally decreased root fructan amounts.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- rootse0
- Treatment
- fertilizatione0
- Outcome
- amounts of fructane0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilization caused a general decrease in amounts of fructan in roots.”
t0“barley”
Claim · model-written summary
Increased fructan in mycorrhizal roots correlated with decreased invertase activity.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- rootse0
- Gene
- invertasee0
- Outcome
- increase of fructane0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase of fructan in mycorrhizal roots was correlated with a decrease of invertase activity.”
t0“barley”
Claim · model-written summary
Leaf fructan pools decreased or were unchanged upon mycorrhizal infection.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leavese0
- Treatment
- mycorrhizal infectione0
- Outcome
- fructan poolse0
- Direction
- decreased or remained unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In leaves, fructan pools decreased or remained unchanged upon mycorrhizal infection”
t0“barley”
Claim · model-written summary
Fertilization similarly decreased or maintained leaf fructan pools.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leavese0
- Treatment
- fertilizatione0
- Outcome
- fructan poolse0
- Direction
- decreased or remained unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In leaves, fructan pools decreased or remained unchanged upon mycorrhizal infection; fertilization had a similar effect.”
t0“barley”
Claim · model-written summary
Non-mycorrhizal barley had highest fructan in youngest leaves and lowest in oldest leaves.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- youngest leavese0
- Outcome
- fructan contentse0
- Direction
- higheste0
- Qualifier
- oldest leaves the loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in non‐mycorrhizal plants, the youngest leaves had the highest fructan contents and the oldest leaves the lowest”
t0“barley”
Claim · model-written summary
Mycorrhizal infection markedly altered the leaf-age fructan gradient.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- mycorrhizal plantse0
- Outcome
- gradiente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this gradient was markedly altered in mycorrhizal plants”
t0“barley”
The same questions in other papers
mycorrhiza · molecular: metabolites · Hordeum vulgare (barley)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
2 papers more in this group
See all 6 papers →fertilization · molecular: metabolites · Hordeum vulgare (barley)Positive and negative results
8 papers in the same direction as this paper · 38 in the opposite direction
- positive
- positive
- positive
43 papers more in this group
See all 47 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.