Abstract
Abstract Alfalfa ( Medicago sativa L.) was grown in greenhouse sand culture to determine the effects of Se(VI), SO 2− 4 ‐salinity and B on alfalfa tissue composition and yield. A 4 × 2 × 2 factorial experiment was conducted with treatments consisting of four Se concentrations (0, 0.25, 0.5, and 1.0 mg Se(VI) L −1 as Na 2 SeO 4 ), two B concentrations (0.5 and 3.0 mg B L −1 as H 3 BO 3 ), and two salinity levels (0.5 and 5.0 dS m −1 as Na 2 SO 4 and CaSO 4 ·2H 2 O). Three cuttings were made and the vegetative portions analyzed for dry weight and total Se, S, and B. Plant yields were significantly reduced by both salinity and Se(VI) but not by B. Tissue Se concentrations were positively correlated with Se in the irrigation water but negatively correlated with SO 2− 4 ‐salinity and B. Plant Se was reduced from 620 mg Se kg −1 to less than 7 mg Se kg −1 in the presence of SO 2− 4 ‐salinity. A synergistic effect between Se and S was found at the basal nutrient concentration of SO 2− 4 (0.5 m M ). Tissue S was increased from less than 3 g S kg −1 to over 10 g S kg −1 with the addition of 1 mg Se L −1 . Alfalfa can potentially accumulate extremely high concentrations of Se when exposed to soluble Se(VI) in the root zone.
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Claims 10
Claim · model-written summary
Salinity significantly reduced alfalfa yield.
- Taxon
- Alfalfa
Medicago sativat0 - Treatment
- salinitye0
- Outcome
- Plant yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant yields were significantly reduced by both salinity and Se(VI) but not by B.”
t0“Alfalfa”
Claim · model-written summary
Se(VI) significantly reduced alfalfa yield.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Se(VI)e0
- Outcome
- Plant yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant yields were significantly reduced by both salinity and Se(VI) but not by B.”
t0“Alfalfa”
Claim · model-written summary
B did not significantly reduce alfalfa yield.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Be0
- Outcome
- Plant yieldse0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant yields were significantly reduced by both salinity and Se(VI) but not by B.”
t0“Alfalfa”
Claim · model-written summary
Alfalfa tissue Se concentration rose with irrigation water Se.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Se in the irrigation watere0
- Outcome
- Tissue Se concentrationse0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue Se concentrations were positively correlated with Se in the irrigation water”
t0“Alfalfa”
Claim · model-written summary
Alfalfa tissue Se concentration fell with sulfate salinity.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- SO 2− 4 ‐salinitye0
- Outcome
- Tissue Se concentrationse0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue Se concentrations were positively correlated with Se in the irrigation water but negatively correlated with SO 2− 4 ‐salinity and B.”
t0“Alfalfa”
Claim · model-written summary
Alfalfa tissue Se concentration fell with B.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Be0
- Outcome
- Tissue Se concentrationse0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue Se concentrations were positively correlated with Se in the irrigation water but negatively correlated with SO 2− 4 ‐salinity and B.”
t0“Alfalfa”
Claim · model-written summary
Sulfate salinity reduced plant Se from 620 to less than 7 mg Se kg −1.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- SO 2− 4 ‐salinitye0
- Outcome
- Plant See0
- Direction
- reducede0
- Value
- less than 7 mg Se kg −1e0
- Qualifier
- 620 mg Se kg −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant Se was reduced from 620 mg Se kg −1 to less than 7 mg Se kg −1 in the presence of SO 2− 4 ‐salinity.”
t0“Alfalfa”
Claim · model-written summary
Se and S showed a synergistic effect at basal sulfate concentration.
- Taxon
- AlfalfaMedicago sativat0
- Compound
- Se and Se0
- Outcome
- synergistic effecte0
- Qualifier
- basal nutrient concentration of SO 2− 4 (0.5 m M )e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A synergistic effect between Se and S was found at the basal nutrient concentration of SO 2− 4 (0.5 m M ).”
t0“Alfalfa”
Claim · model-written summary
Adding 1 mg Se L −1 raised tissue S from less than 3 to over 10 g S kg −1.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- 1 mg Se L −1e0
- Outcome
- Tissue Se0
- Direction
- increasede0
- Value
- over 10 g S kg −1e0
- Qualifier
- less than 3 g S kg −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue S was increased from less than 3 g S kg −1 to over 10 g S kg −1 with the addition of 1 mg Se L −1 .”
t0“Alfalfa”
Claim · model-written summary
Alfalfa may accumulate extremely high Se concentrations under soluble root zone Se(VI).
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- soluble Se(VI) in the root zonee0
- Outcome
- concentrations of See0
- Direction
- extremely highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa can potentially accumulate extremely high concentrations of Se when exposed to soluble Se(VI) in the root zone.”
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