Abstract
• The effects of three arbuscular mycorrhizal (AM) fungal isolates on the expression of genes coding for sucrose synthase and on the nonstructural carbohydrate (CHO) status of maize roots were evaluated. Gene expression and CHOs were compared with their status in nonmycorrhizal plants grown at three soil phosphorus (P) concentrations. • The AM fungi and soil P supply influenced expression of genes coding for sucrose synthase in maize roots. In general, up to 18 d after plant emergence, AM colonization increased the expression of genes coding for sucrose synthase in maize roots, whereas increasing soil P decreased this gene expression. The responses in gene expression were detected earlier than other effects of AM fungal colonization, such as increased leaf P status and plant growth response under limiting P supply. • Higher sucrose-synthase gene expression was not related to the concentration of sucrose, reducing sugars or starch in the root tissue. • Higher gene expression in AM roots confirms that there is greater allocation of sucrose from nonstructural CHO pools in roots for the AM fungus during the earliest phase of colonization than in nonmycorrhizal roots.
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Claims 5
Claim · model-written summary
AM colonization increased expression of genes coding for sucrose synthase in maize roots up to 18 days after emergence.
- Organ / stage
- rootse0
- Treatment
- AM colonizatione0
- Interactor
- AMe0symbiont
- Outcome
- expression of genes coding for sucrose synthasee0
- Direction
- increasede0
- Qualifier
- up to 18 d after plant emergencee1
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AM colonization increased the expression of genes coding for sucrose synthase in maize roots”
e1“up to 18 d after plant emergence”
Claim · model-written summary
Increasing soil phosphorus decreased sucrose synthase gene expression in maize roots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas increasing soil P decreased this gene expression.”
t0“maize roots”
Claim · model-written summary
AM induced expression responses appeared earlier than increased leaf P status and growth responses under limiting phosphorus.
- Interactor
- AM fungale0symbiont
- Outcome
- responses in gene expressione0
- Direction
- earliere0
- Comparator
- increased leaf P status and plant growth responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The responses in gene expression were detected earlier than other effects of AM fungal colonization, such as increased leaf P status and plant growth response under limiting P supply.”
t0“maize roots”
Claim · model-written summary
Higher sucrose synthase gene expression was not related to root sucrose, reducing sugar or starch concentration.
- Organ / stage
- root tissuee0
- Compound
- sucrose, reducing sugars or starche0
- Outcome
- sucrose-synthase gene expressione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher sucrose-synthase gene expression was not related to the concentration of sucrose, reducing sugars or starch in the root tissue.”
t0“maize roots”
Claim · model-written summary
Higher expression in mycorrhizal maize roots supports greater early allocation of root sucrose to the fungus than in nonmycorrhizal roots.
- Interactor
- AM funguse0symbiont
- Outcome
- greater allocation of sucrosee0
- Qualifier
- during the earliest phase of colonizatione0
- Comparator
- nonmycorrhizal rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher gene expression in AM roots confirms that there is greater allocation of sucrose from nonstructural CHO pools in roots for the AM fungus during the earliest phase of colonization than in nonmycorrhizal roots.”
t0“maize roots”
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