Claim · model-written summary
P. australis root growth was maximum at 21% oxygen and at 10 g NaCl/L or less.
- Taxon
- P. australis
Phragmites australise0 - Treatment
- 21% oxygen, at ≤10 g NaCl/Le1
- Outcome
- Root growthe1
- Direction
- maximume1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. australis plumule growth”
e1“Root growth was maximum in 21% oxygen, at ≤10 g NaCl/L and reduced at all salinities in oxygen concentrations ≤10%”
Title
Antonia H. B. M. Wijte; John L. Gallagher American Journal of Botany 1996. doi:10.1002/j.1537-2197.1996.tb13920.x
Other claims from this paper (17)
- Intervention effect Oxygen from 21 down to 2.5% did not affect P. australis plumule growth.
- Intervention effect P. australis plumules were longer at 10 g NaCl/L or less than at 25 g NaCl/L or more.
- Intervention effect P. australis root growth was reduced at all salinities in oxygen concentrations of 10% or less.
- Intervention effect No P. australis plumule or root growth occurred under anoxia.
- Intervention effect Salinity did not affect S. alterniflora mesocotyl emergence.
- Intervention effect S. alterniflora mesocotyl emergence was fastest in anoxia and hypoxia.
- Intervention effect S. alterniflora mesocotyls did not emerge from the spikelet in 21% oxygen.
- Intervention effect S. alterniflora plumule growth was fastest in 21% oxygen.
- Intervention effect S. alterniflora plumule growth was inhibited in anoxia.
- Intervention effect Under low oxygen and high salinity both plumule and root elongation were reduced.
- Intervention effect Coleoptile and mesocotyl elongation were greatest in 2.5 and 5% oxygen and shortest in anoxia.
- Intervention effect The percentage of mesocotyls elongating was highest in 2.5% oxygen.
- Mechanism Rapid S. alterniflora coleoptile and mesocotyl elongation in anoxia is interpreted to enable seedlings to escape the stressful environment where seeds germinate.
- Intervention effect With CO2 and illumination, S. alterniflora seedlings grown in dark for 10 d developed roots and plumule elongation inside the coleoptile at salinities up to 40 g NaCl/L while the external environment stayed anoxic.
- Intervention effect Without CO2, S. alterniflora plumule growth and root development did not occur.
- Mechanism The authors suggest oxygen was produced inside the coleoptile by the photosynthesizing plumule and triggered root development in S. alterniflora.
- Observation The ability of S. alterniflora seedlings to continue development under external anoxia and high salinity gives it a competitive advantage over P. australis in high salinity and/or poorly drained marshes.