Abstract
The effects of N and P deficiency, isolated or in combination, on leaf gas exchange and fast chlorophyll (Chl) fluorescence emission were studied in common bean cv. Negrito. 10-d-old plants grown in aerated nutrient solution were supplied with high N (HN, 7.5 mol m-3) or low N (LN, 0.5 mol m-3), and also with high P (HP, 0.5 mol m-3) or low P (LP, 0.005 mol m-3). Regardless of the external P supply, in LN plants the initial fluorescence (F0) increased 12 % in parallel to a quenching of about 14 % in maximum fluorescence (Fm). As a consequence, the variable to maximum fluorescence ratio (Fv/Fm) decreased by about 7 %, and the variable to initial fluorescence ratio (Fv/F0) was lowered by 25 % in relation to control plants. In LP plants, Fv/Fm remained unchanged whilst Fv/F0 decreased slightly as a result of 5 % decline in Fm. Under N deficiency, the net photosynthetic rate (P N) halved at 6 d after imposition of treatment and so remained afterwards. As compared to LN plants, P N declined in LP plants latter and to a less extent. From 12 d of P deprivation onwards. P N fell down progressively to display rates similar to those of LN plants only at the end of the experiment. The greater P N in LP plants was not reflected in larger biomass accumulation in relation to LN beans. In general, P and N limitation affected photosynthesis parameters and growth without showing any synergistic or additive effect between deficiency of both nutrients.
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Claims 11
Claim · model-written summary
In low-N plants initial fluorescence F0 increased 12 % regardless of external P supply.
- Taxon
- Phaseolus Vulgaris
Phaseolus vulgarist0 - Treatment
- LNe0
- Outcome
- initial fluorescence (F0)e0
- Direction
- increasede0
- Value
- 12 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“in LN plants the initial fluorescence (F0) increased 12 %”
Claim · model-written summary
In low-N plants maximum fluorescence Fm was quenched by about 14 %.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Treatment
- LNe0
- Outcome
- maximum fluorescence (Fm)e0
- Direction
- quenchinge0
- Value
- about 14 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“in LN plants the initial fluorescence (F0) increased 12 % in parallel to a quenching of about 14 % in maximum fluorescence (Fm)”
Claim · model-written summary
In low-N plants Fv/Fm decreased by about 7 %.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Outcome
- variable to maximum fluorescence ratio (Fv/Fm)e0
- Direction
- decreasede0
- Value
- about 7 %e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“the variable to maximum fluorescence ratio (Fv/Fm) decreased by about 7 %”
Claim · model-written summary
In low-N plants Fv/F0 was lowered by 25 % relative to control plants.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Outcome
- variable to initial fluorescence ratio (Fv/F0)e0
- Direction
- lowerede0
- Value
- 25 %e0
- Comparator
- control plantse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“the variable to initial fluorescence ratio (Fv/F0) was lowered by 25 % in relation to control plants”
Claim · model-written summary
In low-P plants Fv/Fm remained unchanged.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Treatment
- LPe0
- Outcome
- Fv/Fme0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“In LP plants, Fv/Fm remained unchanged”
Claim · model-written summary
In low-P plants Fv/F0 decreased slightly as a result of a 5 % decline in Fm.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Outcome
- Fv/F0e0
- Direction
- decreasede0
- Value
- 5 % decline in Fme0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“Fv/F0 decreased slightly as a result of 5 % decline in Fm”
Claim · model-written summary
Under N deficiency the net photosynthetic rate halved at 6 d after imposition of treatment and remained so afterwards.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Treatment
- N deficiencye0
- Outcome
- net photosynthetic rate (P N)e0
- Direction
- halvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“Under N deficiency, the net photosynthetic rate (P N) halved at 6 d after imposition of treatment and so remained afterwards”
Claim · model-written summary
Compared with low-N plants, net photosynthetic rate declined later and to a lesser extent in low-P plants.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Treatment
- LPe0
- Outcome
- P Ne0
- Direction
- declinede0
- Comparator
- LN plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“As compared to LN plants, P N declined in LP plants latter and to a less extent”
Claim · model-written summary
From 12 d of P deprivation, net photosynthetic rate fell progressively to rates similar to low-N plants only at the end of the experiment.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Treatment
- P deprivatione0
- Outcome
- P Ne0
- Direction
- fell downe0
- Comparator
- LN plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“From 12 d of P deprivation onwards. P N fell down progressively to display rates similar to those of LN plants only at the end of the experiment”
Claim · model-written summary
The greater photosynthetic rate in low-P plants was not reflected in larger biomass accumulation relative to low-N beans.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Treatment
- LPe0
- Outcome
- larger biomass accumulatione0
- Direction
- not reflectede0
- Comparator
- LN beanse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“The greater P N in LP plants was not reflected in larger biomass accumulation in relation to LN beans”
Claim · model-written summary
P and N limitation affected photosynthesis parameters and growth without any synergistic or additive effect between deficiency of both nutrients.
- Taxon
- Phaseolus VulgarisPhaseolus vulgarist0
- Treatment
- P and N limitatione0
- Outcome
- photosynthesis parameters and growthe0
- Direction
- affectede0
- Qualifier
- without showing any synergistic or additive effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus Vulgaris”
e0“P and N limitation affected photosynthesis parameters and growth without showing any synergistic or additive effect between deficiency of both nutrients”
The same questions in other papers
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This paper is about lacking the nutrient, so it counts the other way round here.
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See all 12 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.