Abstract
Five freshwater marsh plant species exhibited different root metabolic responses when flooded to three water depths in field macrocosms. The capacity for alcoholic fermentation (as indicated by alcohol dehydrogenase activity) increased and remained at a relatively high level in the roots of the least flood-tolerant species, Scolochloa festucacea, but was not stimulated significantly or only temporarily in the more tolerant species, Scirpus acutus, Scirpus validus, Typha glauca, and Phragmites australis. During the first month of flooding, alcohol dehydrogenase activity showed a positive relationship with flooding depth and a negative relationship with soil redox potential. Malate accumulated in the roots of S. acutus, S. validus, and to a lesser extent in P. australis in response to flooding; concentrations showed a significant positive relationship with water depth and a significant negative relationship with soil redox potential during the first month of flooding. Differences in root metabolism among the five species were still evident after 1 year of continual flooding. Root specific gravities and air space cross-sectional volumes demonstrated potential species differences in root resistance to oxygen movement and root oxygen volume, respectively. The results suggest that the observed metabolic response reflected differential aeration of the roots resulting from differences in root structure and soil oxygen demand (reducing power).
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Claims 12
Claim · model-written summary
The five marsh species had differing root metabolic responses to flooding depth.
Verbatim
e0“Five freshwater marsh plant species exhibited different root metabolic responses when flooded to three water depths in field macrocosms.”
Claim · model-written summary
Flooding increased and maintained high root fermentation capacity in Scolochloa festucacea.
- Taxon
- Scolochloa festucacea
Scolochloa festucaceae0 - Organ / stage
- rootse0
- Gene
- alcohol dehydrogenasee0
- Outcome
- capacity for alcoholic fermentatione0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The capacity for alcoholic fermentation (as indicated by alcohol dehydrogenase activity) increased and remained at a relatively high level in the roots of the least flood-tolerant species, Scolochloa festucacea”
Claim · model-written summary
Alcoholic fermentation capacity was not significantly or only briefly stimulated in the more tolerant species.
- Taxon
- Scirpus acutus, Scirpus validus, Typha glauca, and Phragmites australis
Phragmites australis
Schoenoplectus acutus
Schoenoplectus tabernaemontani
Typha ×glaucae0 - Outcome
- stimulatede0
- Direction
- not stimulated significantly or only temporarilye0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was not stimulated significantly or only temporarily in the more tolerant species, Scirpus acutus, Scirpus validus, Typha glauca, and Phragmites australis.”
Claim · model-written summary
Root alcohol dehydrogenase activity rose with flooding depth during the first month.
Verbatim
e0“During the first month of flooding, alcohol dehydrogenase activity showed a positive relationship with flooding depth and a negative relationship with soil redox potential.”
e1“Five freshwater marsh plant species exhibited different root metabolic responses”
Claim · model-written summary
Root alcohol dehydrogenase activity declined as soil redox potential rose during the first month.
Verbatim
e0“During the first month of flooding, alcohol dehydrogenase activity showed a positive relationship with flooding depth and a negative relationship with soil redox potential.”
e1“Five freshwater marsh plant species exhibited different root metabolic responses”
Claim · model-written summary
Flooding caused root malate accumulation in S. acutus and S. validus.
- Taxon
- S. acutus, S. validusSchoenoplectus acutusSchoenoplectus tabernaemontanie0
- Organ / stage
- rootse0
- Treatment
- floodinge0
- Outcome
- Malatee0
- Direction
- accumulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Malate accumulated in the roots of S. acutus, S. validus, and to a lesser extent in P. australis in response to flooding”
Claim · model-written summary
Flooding caused less root malate accumulation in P. australis.
- Taxon
- P. australisPhragmites australise0
- Organ / stage
- rootse0
- Treatment
- floodinge0
- Outcome
- Malatee0
- Direction
- to a lesser extente0
- Comparator
- S. acutus, S. validuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Malate accumulated in the roots of S. acutus, S. validus, and to a lesser extent in P. australis in response to flooding”
Claim · model-written summary
Root malate concentration correlated positively with water depth.
Verbatim
e0“concentrations showed a significant positive relationship with water depth and a significant negative relationship with soil redox potential during the first month of flooding.”
e1“Malate accumulated in the roots of S. acutus, S. validus, and to a lesser extent in P. australis”
Claim · model-written summary
Root malate concentration correlated negatively with soil redox potential.
Verbatim
e0“concentrations showed a significant positive relationship with water depth and a significant negative relationship with soil redox potential during the first month of flooding.”
e1“Malate accumulated in the roots of S. acutus, S. validus, and to a lesser extent in P. australis”
Claim · model-written summary
Species differences in root metabolism persisted after a year of flooding.
Verbatim
e0“Differences in root metabolism among the five species were still evident after 1 year of continual flooding.”
e1“Five freshwater marsh plant species”
Claim · model-written summary
Root specific gravity and air-space volume suggested species differences in oxygen movement resistance and oxygen volume.
Verbatim
e0“Root specific gravities and air space cross-sectional volumes demonstrated potential species differences in root resistance to oxygen movement and root oxygen volume, respectively.”
e1“Five freshwater marsh plant species”
Claim · model-written summary
The authors interpret differing metabolic responses as reflecting differential root aeration caused by root structure and soil oxygen demand.
Verbatim
e0“The results suggest that the observed metabolic response reflected differential aeration of the roots resulting from differences in root structure and soil oxygen demand (reducing power).”
e1“Five freshwater marsh plant species”