Abstract
Plantago lanceolata L., a grassland species from a relatively nutrient‐poor habitat, was grown in nutrient‐rich and in nutrient‐poor culture solutions. Half of the plants were trensferred from high to low or from low to high nutrient conditions. Shoot growth was immediately reduced upon transfer to low nutrient conditions, whilst it reacted more slowly upon transfer of plants to high nutrient conditions. Root growth was less dependent on the supply of nutrients, but it was slightly reduced upon transfer of plants to high nutrient conditions. Photosynthesis was largely independent of the nutrient supply, apart from an initial increase upon transfer of plants to low nutrient conditions. Photosynthesis decreased with age in all treatments, and this decrease was not due to mutual shading. The decrease of photosynthetic rate was not accompanied by a decreased relative growth rate: it was compensated by a more efficient root respiration, since the activity of the alternative nonphosphorylating pathway continuously decreased in plants grown in a high nutrient environment. It is concluded that the alternative pathway was of significance in removal of carbohydrates, which could not be utilized for growth, energy production, etc. , due to a temporary or structural imbalance between assimilate production and requirement. The alternative pathway also appeared to allow P. lanceolata plants to adapt to a changed environment as regards mineral nutrition. The experimental value for root growth respiration of P. lanceolata grown under high nutrient conditions was compared with a theoretical value, calculated from the biochemical composition of plant dry matter and the known energy costings for biosynthetic and transport processes. A good correlation between the experimental and theoretical value of root growth respiration was found if it was assumed that ion uptake required c . 1.0 molecule of ATP per ion per membrane passage.
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Claims 13
Claim · model-written summary
Shoot growth of Plantago lanceolata was immediately reduced upon transfer to low nutrient conditions.
- Taxon
- Plantago lanceolata
Plantago lanceolatat0 - Treatment
- transfer to low nutrient conditionse0
- Outcome
- Shoot growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth was immediately reduced upon transfer to low nutrient conditions”
t0“Plantago lanceolata”
Claim · model-written summary
Shoot growth reacted more slowly upon transfer of plants to high nutrient conditions.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Treatment
- transfer of plants to high nutrient conditionse1
- Outcome
- Shoot growthe1
- Direction
- reacted more slowlye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Shoot growth was immediately reduced upon transfer to low nutrient conditions, whilst it reacted more slowly upon transfer of plants to high nutrient conditions”
t0“Plantago lanceolata”
Claim · model-written summary
Root growth was slightly reduced upon transfer of plants to high nutrient conditions, and was less dependent on nutrient supply.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Treatment
- transfer of plants to high nutrient conditionse2
- Outcome
- Root growthe2
- Direction
- slightly reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Root growth was less dependent on the supply of nutrients, but it was slightly reduced upon transfer of plants to high nutrient conditions”
t0“Plantago lanceolata”
Claim · model-written summary
Photosynthesis was largely independent of the nutrient supply.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Treatment
- nutrient supplye3
- Outcome
- Photosynthesise3
- Direction
- largely independente3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Photosynthesis was largely independent of the nutrient supply”
t0“Plantago lanceolata”
Claim · model-written summary
Photosynthesis showed an initial increase upon transfer of plants to low nutrient conditions.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Treatment
- transfer of plants to low nutrient conditionse4
- Outcome
- Photosynthesise4
- Direction
- initial increasee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Photosynthesis was largely independent of the nutrient supply, apart from an initial increase upon transfer of plants to low nutrient conditions”
t0“Plantago lanceolata”
Claim · model-written summary
Photosynthesis decreased with age in all treatments.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Outcome
- Photosynthesise5
- Direction
- decreasede5
- Qualifier
- with age in all treatmentse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Photosynthesis decreased with age in all treatments”
t0“Plantago lanceolata”
Claim · model-written summary
The decrease in photosynthesis with age was not due to mutual shading.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Outcome
- decreasee6
- Qualifier
- not due to mutual shadinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“this decrease was not due to mutual shading”
t0“Plantago lanceolata”
Claim · model-written summary
The decrease of photosynthetic rate was not accompanied by a decreased relative growth rate.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Outcome
- relative growth ratee7
- Direction
- not accompanied by a decreasede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The decrease of photosynthetic rate was not accompanied by a decreased relative growth rate”
t0“Plantago lanceolata”
Claim · model-written summary
The activity of the alternative nonphosphorylating pathway continuously decreased in plants grown in a high nutrient environment.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Treatment
- high nutrient environmente0
- Outcome
- activity of the alternative nonphosphorylating pathwaye0
- Direction
- continuously decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activity of the alternative nonphosphorylating pathway continuously decreased in plants grown in a high nutrient environment”
t0“Plantago lanceolata”
Claim · model-written summary
The decrease in photosynthetic rate was compensated by a more efficient root respiration.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Outcome
- compensatede1
- Qualifier
- more efficient root respiratione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“it was compensated by a more efficient root respiration”
t0“Plantago lanceolata”
Claim · model-written summary
The alternative pathway was concluded to be of significance in removal of carbohydrates that could not be used for growth or energy production.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Outcome
- removal of carbohydratese2
- Qualifier
- alternative pathwaye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“the alternative pathway was of significance in removal of carbohydrates”
t0“Plantago lanceolata”
Claim · model-written summary
The alternative pathway appeared to allow P. lanceolata plants to adapt to a changed environment as regards mineral nutrition.
- Taxon
- P. lanceolataPlantago lanceolatae3
- Outcome
- adapt to a changed environment as regards mineral nutritione3
- Qualifier
- alternative pathwaye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The alternative pathway also appeared to allow P. lanceolata plants to adapt to a changed environment as regards mineral nutrition”
Claim · model-written summary
Experimental and theoretical values of root growth respiration correlated well if ion uptake was assumed to require about 1.0 ATP per ion per membrane passage.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Outcome
- root growth respiratione4
- Qualifier
- ion uptake required c . 1.0 molecule of ATP per ion per membrane passagee4
- Comparator
- theoretical valuee4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“A good correlation between the experimental and theoretical value of root growth respiration was found if it was assumed that ion uptake required c . 1.0 molecule of ATP per ion per membrane passage”
t0“Plantago lanceolata”