Abstract
In order to study the mechanisms of Se-mediated growth improvement as related to carbon (C) and nitrogen (N) metabolism, wheat plants were cultivated hydroponically with adequate (4 mM, Na) or low (1 mM, Nd) N supply and treated with 10 and 50 μM Na2SeO4 for six weeks. The Se supplementation enhanced plant biomass; it was significant for shoots of Na plants at 50 μM Se. Chlorophyll fluorescence parameters were significantly lowered under Nd conditions but restored completely by Se addition reaching values of those in Na plants. Net CO2 assimilation rate (P N) decreased only slightly by limited N availability, but it enhanced significantly in both Nd and Na plants equally by 10 and 50 μM Se. Effect of Se on P N in the Na plants occurred mainly due to the stomata opening, while it was related to both stomatal and nonstomatal mechanisms in the Nd plants. The Se treatment resulted in enhancement of nitrate reductase (NR) activity in both Na and Nd plants with an optimal response at 10 μM Se. Negative correlations between nitrate concentration and NR activity indicated a partial nitrate depletion in the roots following by elevated NR activity in Nd plants. In contrast, nitrite concentrations were higher in the Se treated plants. Higher amino acids and protein concentrations in the Se-treated plants might be an indication of a general upregulation of N metabolism. However, in Na plants, the stimulation of N metabolism was not observed at 50 μM Se which could not be attributed to lesser availability of C skeletons because of maintaning higher CO2 fixation under these conditions. It implies the function of some regulatory mechanisms that are responsible for coordination of C and N metabolism in whole plant.
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Claims 10
Claim · model-written summary
Selenium enhanced wheat biomass, significantly in shoots at 50 μM under adequate nitrogen.
- Taxon
- wheat (Triticum aestivum L.)
Triticum aestivumt0 - Organ / stage
- shootse0
- Treatment
- Se supplementatione0
- Outcome
- plant biomasse0
- Direction
- enhancede0
- Value
- 50 μM See0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Se supplementation enhanced plant biomass; it was significant for shoots of Na plants at 50 μM Se.”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Limited nitrogen significantly lowered chlorophyll fluorescence parameters.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- Nd conditionse0
- Outcome
- Chlorophyll fluorescence parameterse0
- Direction
- lowerede0
- Comparator
- Na plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll fluorescence parameters were significantly lowered under Nd conditions but restored completely by Se addition reaching values of those in Na plants.”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Selenium restored chlorophyll fluorescence under limited nitrogen.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- Se additione0
- Outcome
- Chlorophyll fluorescence parameterse0
- Direction
- restored completelye0
- Comparator
- Nd conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll fluorescence parameters were significantly lowered under Nd conditions but restored completely by Se addition reaching values of those in Na plants.”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Limited nitrogen slightly decreased net CO2 assimilation.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- limited N availabilitye0
- Outcome
- Net CO2 assimilation rate (P N)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net CO2 assimilation rate (P N) decreased only slightly by limited N availability”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Selenium significantly enhanced net CO2 assimilation under both nitrogen regimes.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- 10 and 50 μM See0
- Outcome
- Net CO2 assimilation rate (P N)e1
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it enhanced significantly in both Nd and Na plants equally by 10 and 50 μM Se”
e1“Net CO2 assimilation rate (P N)”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Selenium enhanced nitrate reductase activity under both nitrogen regimes.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- Se treatmente0
- Gene
- nitrate reductase (NR)e0
- Outcome
- nitrate reductase (NR) activitye0
- Direction
- enhancemente0
- Value
- 10 μM See0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Se treatment resulted in enhancement of nitrate reductase (NR) activity in both Na and Nd plants with an optimal response at 10 μM Se.”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Nitrate concentration and nitrate reductase activity were negatively correlated.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Organ / stage
- rootse0
- Gene
- NRe0
- Outcome
- nitrate concentratione0
- Direction
- Negative correlationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Negative correlations between nitrate concentration and NR activity indicated a partial nitrate depletion in the roots following by elevated NR activity in Nd plants.”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Selenium treated plants had higher nitrite concentrations.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- Se treatede0
- Outcome
- nitrite concentrationse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrite concentrations were higher in the Se treated plants”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
Selenium treated plants had higher amino acid and protein concentrations.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- Se-treatede0
- Outcome
- amino acids and protein concentrationse0
- Direction
- Highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher amino acids and protein concentrations in the Se-treated plants”
t0“wheat (Triticum aestivum L.)”
Claim · model-written summary
At 50 μM selenium, nitrogen metabolism was not stimulated under adequate nitrogen.
- Taxon
- wheat (Triticum aestivum L.)Triticum aestivumt0
- Treatment
- 50 μM See0
- Outcome
- stimulation of N metabolisme0
- Direction
- not observede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Na plants, the stimulation of N metabolism was not observed at 50 μM Se”
t0“wheat (Triticum aestivum L.)”
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