Abstract
Although the physiological and molecular responses of Citrus to Al-toxicity or low pH have been examined in some details, little information is available on Citrus responses to pH and aluminum (Al) interactions. Citrus sinensis seedlings were irrigated for 18 weeks with nutrient solution at a concentration of 0 or 1 mM AlCl 3 •6H 2 O and a pH of 2.5, 3.0, 3.5, or 4.0. Thereafter, biomass, root, stem, and leaf concentrations of Al and nutrients, leaf gas exchange, chlorophyll a fluorescence (OJIP) transients, and related parameters were investigated to understand the physiological mechanisms underlying the elevated pH-induced alleviation of Citrus toxicity. Increasing the nutrient solution pH from 2.5 to 4.0 alleviated the Al-toxic effects on biomass, photosynthesis, OJIP transients and related parameters, and element concentrations, uptake, and distributions. In addition, low pH effects on the above physiological parameters were intensified by Al-toxicity. Evidently, a synergism existed between low pH and Al-toxicity. Increasing pH decreased Al uptake per root dry weight and its concentration in roots, stems, and leaves and increased nitrogen, phosphorus, calcium, magnesium, sulfur, and boron uptake per plant and their concentrations in roots, stems, and leaves. This might be responsible for the elevated pH-induced alleviation of growth inhibition and the impairment of the whole photosynthetic electron transport chain, thus preventing the decrease of CO 2 assimilation.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Raising nutrient solution pH from 2.5 to 4.0 alleviated Al-toxic effects on biomass, photosynthesis and OJIP transients in Citrus sinensis seedlings.
- Taxon
- Citrus sinensis
Citrus sinensist0 - Treatment
- Increasing the nutrient solution pH from 2.5 to 4.0e0
- Outcome
- biomass, photosynthesis, OJIP transientse0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus sinensis Seedlings”
e0“Increasing the nutrient solution pH from 2.5 to 4.0 alleviated the Al-toxic effects on biomass, photosynthesis, OJIP transients and related parameters, and element concentrations, uptake, and distributions”
Claim · model-written summary
Raising nutrient solution pH from 2.5 to 4.0 alleviated Al-toxic effects on element concentrations, uptake and distributions in Citrus sinensis seedlings.
- Taxon
- Citrus sinensisCitrus sinensist0
- Treatment
- Increasing the nutrient solution pH from 2.5 to 4.0e0
- Outcome
- element concentrations, uptake, and distributionse0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus sinensis Seedlings”
e0“Increasing the nutrient solution pH from 2.5 to 4.0 alleviated the Al-toxic effects on biomass, photosynthesis, OJIP transients and related parameters, and element concentrations, uptake, and distributions”
Claim · model-written summary
Increasing pH decreased Al uptake per root dry weight and Al concentration in roots, stems and leaves.
- Taxon
- Citrus sinensisCitrus sinensist0
- Organ / stage
- roots, stems, and leavese1
- Treatment
- Increasing pHe1
- Outcome
- Al uptake per root dry weighte1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus sinensis Seedlings”
e1“Increasing pH decreased Al uptake per root dry weight and its concentration in roots, stems, and leaves”
Claim · model-written summary
Increasing pH increased nitrogen, phosphorus and calcium uptake per plant.
- Taxon
- Citrus sinensisCitrus sinensist0
- Treatment
- Increasing pHe1
- Outcome
- nitrogen, phosphorus, calciume2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus sinensis Seedlings”
e1“Increasing pH decreased Al uptake per root dry weight and its concentration in roots, stems, and leaves”
e2“increased nitrogen, phosphorus, calcium, magnesium, sulfur, and boron uptake per plant and their concentrations in roots, stems, and leaves”
Claim · model-written summary
Increasing pH increased magnesium, sulfur and boron uptake per plant.
- Taxon
- Citrus sinensisCitrus sinensist0
- Treatment
- Increasing pHe1
- Outcome
- magnesium, sulfur, and boron uptake per plante2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus sinensis Seedlings”
e1“Increasing pH decreased Al uptake per root dry weight and its concentration in roots, stems, and leaves”
e2“increased nitrogen, phosphorus, calcium, magnesium, sulfur, and boron uptake per plant and their concentrations in roots, stems, and leaves”
The same questions in other papers
fertilization · physiology: photosynthesis · Citrus sinensis (sweet orange)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
ph · growth · Citrus sinensis (sweet orange)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- no effect
2 papers more in this group
See all 6 papers →fertilization · nutrient: content · Citrus sinensis (sweet orange)Positive and negative results
25 papers in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- no effect
27 papers more in this group
See all 31 papers →ph · nutrient: content · Citrus sinensis (sweet orange)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.