Claim · model-written summary
Seedling and especially needle relative growth rates differed during the first two weeks under low phosphorus.
- Taxon
- Pond pine
Pinus serotinae2 - Treatment
- Low Pe1
- Outcome
- seedling RGR, particularly needle RGRe0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences in seedling RGR, particularly needle RGR, were discernable during the first 2 weeks”
e1“Low P treatment effects on CER”
e2“Pond pine ( Pinus serotina Michx.) seedlings”
Title
Mary A. Topa; John M. Cheeseman Physiologia Plantarum 1992. doi:10.1111/j.1399-3054.1992.tb01322.x
Other claims from this paper (18)
- Intervention effect Aeration had no significant effect on shoot dry weight or shoot ontogeny.
- Intervention effect Hypoxia reduced root dry weight after eight weeks regardless of phosphorus treatment.
- Intervention effect Under high phosphorus, hypoxia initially decreased root relative growth rate.
- Observation Root relative growth rate recovered by week six with adventitious root production.
- Intervention effect Two weeks of hypoxia reduced carbon dioxide exchange rate by over 30% under high phosphorus.
- Intervention effect Two weeks of hypoxia reduced stomatal conductance by over 30% under high phosphorus.
- Association Stomatal closure did not accompany a decrease in intracellular carbon dioxide.
- Association Stomatal closure accompanied increased starch accumulation.
- Association Recovery of carbon exchange, stomatal conductance and carbohydrate metabolism coincided with root growth recovery.
- Intervention effect Low phosphorus did not significantly affect shoot or root dry weight until week six.
- Association Low phosphorus effects on carbon exchange paralleled changes in needle relative growth.
- Intervention effect Needle relative growth was more affected than carbon exchange under low phosphorus.
- Intervention effect After six weeks, low phosphorus reduced carbon exchange rate by 15% in aerobic seedlings.
- Intervention effect After six weeks, low phosphorus reduced needle relative growth by 31%.
- Intervention effect After six weeks, low phosphorus reduced needle inorganic phosphorus by 75%.
- Mechanism Recently expanded needles had increased starch concentrations, probably from diminished growth.
- Intervention effect Low phosphorus inhibited shoot growth, especially needle expansion and emergence of new fascicular needles.
- Mechanism The authors infer inhibited growth limited net carbon fixed per plant more than direct effects on carbon exchange.