Abstract
Abstract BACKGROUND Selenium (Se) is a nutrient for animals and humans, and is considered beneficial to higher plants. Selenium concentrations are low in most soils, which can result in a lack of Se in plants, and consequently in human diets. Phytic acid (PA) is the main storage form of phosphorus in seeds, and it is able to form insoluble complexes with essential minerals in the monogastric gut. This study aimed to establish optimal levels of Se application to cowpea, with the aim of increasing Se concentrations. The efficiency of agronomic biofortification was evaluated by the application of seven levels of Se (0, 2.5, 5, 10, 20, 40, and 60 g ha −1 ) from two sources (selenate and selenite) to the soil under field conditions in 2016 and 2017. RESULTS Application of Se as selenate led to greater plant Se concentrations than application as selenite in both leaves and grains. Assuming human cowpea consumption of 54.2 g day −1 , Se application of 20 g ha −1 in 2016 or 10 g ha −1 in 2017 as selenate would have provided a suitable daily intake of Se (between 20 and 55 μg day −1 ) for humans. Phytic acid showed no direct response to Se application. CONCLUSION Selenate provides greater phytoavailability than selenite. The application of 10 g Se ha −1 of selenate to cowpea plants could provide sufficient seed Se to increase daily human intake by 13–14 μg d −1 . © 2019 Society of Chemical Industry
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Claims 6
Claim · model-written summary
Selenate produced greater selenium concentrations than selenite in cowpea leaves and grain.
- Taxon
- cowpea
Vigna unguiculatat0 - Organ / stage
- leaves and grainse0
- Treatment
- Se as selenatee0
- Outcome
- plant Se concentrationse0
- Direction
- greatere0
- Comparator
- selenitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Se as selenate led to greater plant Se concentrations than application as selenite in both leaves and grains”
t0“cowpea”
Claim · model-written summary
Selenate at 20 g per hectare in 2016 was estimated to give suitable daily human selenium intake from cowpea.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- 20 g ha −1 in 2016e0
- Outcome
- suitable daily intake of See0
- Value
- between 20 and 55 μg day −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Se application of 20 g ha −1 in 2016 or 10 g ha −1 in 2017 as selenate would have provided a suitable daily intake of Se (between 20 and 55 μg day −1 ) for humans”
t0“cowpea”
Claim · model-written summary
Selenate at 10 g per hectare in 2017 was estimated to give suitable daily human selenium intake from cowpea.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- 10 g ha −1 in 2017 as selenatee0
- Outcome
- suitable daily intake of See0
- Value
- between 20 and 55 μg day −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10 g ha −1 in 2017 as selenate would have provided a suitable daily intake of Se (between 20 and 55 μg day −1 ) for humans”
t0“cowpea”
Claim · model-written summary
Cowpea phytic acid had no direct response to selenium application.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Se applicatione0
- Outcome
- Phytic acide0
- Direction
- no direct responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phytic acid showed no direct response to Se application”
t0“cowpea”
Claim · model-written summary
Selenate had greater phytoavailability than selenite.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- phytoavailabilitye0
- Direction
- greatere0
- Comparator
- selenitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selenate provides greater phytoavailability than selenite”
t0“cowpea”
Claim · model-written summary
The authors suggest 10 g Se per hectare of selenate to cowpea for seed selenium that could increase human intake by 13–14 μg per day.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- 10 g Se ha −1 of selenatee0
- Outcome
- sufficient seed See0
- Value
- 13–14 μg d −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 10 g Se ha −1 of selenate to cowpea plants could provide sufficient seed Se to increase daily human intake by 13–14 μg d −1”
The same questions in other papers
selenium atom · molecular: metabolites · Vigna unguiculata (cowpea)Positive and negative results
1 in the opposite direction
- positive
selenium atom · nutrient: content · Vigna unguiculata (cowpea)Results agree
1 paper in the same direction as this paper
- positive
selenate · nutrient: content · Vigna unguiculata (cowpea)Results agree
1 paper in the same direction as this paper
- 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.