Abstract
Abstract To investigate whether effects of Al in the sorghum genotypes SCO283 (Al‐tolerant) and NB9040 (Al‐sensitive) are primary effects of Al toxicity, a short‐term experiment was carried out. After 21 days of pregrowth in an Al‐free nutrient solution, plants were exposed to nutrient solutions without or with 10 mg 1‐1 Al for 96 h. Nitrogen was supplied as NH4NO3. Twenty four h after Al supply, the relative uptake of all nutrient cations and anions, except NH4 +, declined to values varying between 0.8 (K+) and 0.2 (Ca2+, Mg2+). In contrast, the uptake of NH4 + was stimulated by Al in both sorghum lines. Total cation uptake and uptake of total nitrogen were balanced by the stimulation of NH4 + uptake. As a consequence, excess cation uptake and proton efflux were increased by Al, especially in the Al‐sensitive line, NB9040. Time relationships of nutrient uptake (except for NH4 +) and root respiration showed close resemblance, i.e. a decline within 24 h followed by a stable phase. This could indicate that effects of Al on nutrient uptake were energy‐linked. Increased NH4 + preference in the presence of Al was the result of stimulated NH4 + uptake and inhibited NO3 ‐ absorption. Decreased NO3 ‐ absorption was observed within 24 h after Al supply and resulted in reduced NO3 ‐xylem transport and lower shoot NRA. The results of this short‐term experiment confirm earlier findings of an Al‐induced increase in NH4 + preference as well as enhanced net proton efflux. Effects on nutrient uptake, root respiration and NRA may be primary Al effects since changes were observed 24 h after Al supply.
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Claims 8
Claim · model-written summary
Al reduced uptake of nutrient ions other than ammonium within 24 hours.
- Treatment
- Al supplye0
- Outcome
- relative uptake of all nutrient cations and anions, except NH4 +e0
- Direction
- declinede0
- Value
- 0.8 (K+) and 0.2 (Ca2+, Mg2+)e0
- Qualifier
- Twenty four he0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Twenty four h after Al supply, the relative uptake of all nutrient cations and anions, except NH4 +, declined to values varying between 0.8 (K+) and 0.2 (Ca2+, Mg2+).”
t0“sorghum”
Claim · model-written summary
Al stimulated ammonium uptake in both sorghum lines.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the uptake of NH4 + was stimulated by Al in both sorghum lines.”
Claim · model-written summary
Al increased excess cation uptake and proton efflux, especially in the sensitive line.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess cation uptake and proton efflux were increased by Al, especially in the Al‐sensitive line, NB9040.”
t0“sorghum”
Claim · model-written summary
Root respiration declined within 24 hours and then stabilized.
- Treatment
- Alt0
- Outcome
- root respiratione0
- Direction
- declinee0
- Qualifier
- within 24 h followed by a stable phasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root respiration showed close resemblance, i.e. a decline within 24 h followed by a stable phase.”
t0“effects of Al on nutrient uptake, H+ efflux, root respiration and nitrate reductase activity of two sorghum genotypes”
Claim · model-written summary
Al stimulated ammonium uptake and inhibited nitrate absorption, increasing ammonium preference.
- Treatment
- Ale0
- Outcome
- Increased NH4 + preferencee0
- Qualifier
- stimulated NH4 + uptake and inhibited NO3 ‐ absorptione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased NH4 + preference in the presence of Al was the result of stimulated NH4 + uptake and inhibited NO3 ‐ absorption.”
t0“sorghum”
Claim · model-written summary
Al reduced nitrate absorption within 24 hours.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreased NO3 ‐ absorption was observed within 24 h after Al supply”
t0“sorghum”
Claim · model-written summary
Reduced nitrate absorption lowered nitrate xylem transport.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreased NO3 ‐ absorption was observed within 24 h after Al supply and resulted in reduced NO3 ‐xylem transport and lower shoot NRA.”
t0“sorghum”
Claim · model-written summary
Reduced nitrate absorption lowered shoot nitrate reductase activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreased NO3 ‐ absorption was observed within 24 h after Al supply and resulted in reduced NO3 ‐xylem transport and lower shoot NRA.”
t0“sorghum”
The same questions in other papers
aluminium atom · nutrient: content · SorghumPositive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.