Abstract
Luminosity and temperature are factors that directly act in photosynthetic process, in which the elevation of the light intensity may provoke reduction in the assimilation of carbon, impairing the development of the soybean culture. This work aimed to know physiological parameters of soybean (Glycine max L. Merr.) under different intensities of artificial light. The experiment was carried out in randomized blocks, in a factorial scheme 2 × 5, being two soybean cultivars (Potência and NS6700) and five densities of light: 0 (control), 500, 1000, 1500 and 2000 μmol m-2 s-1 of photosynthetically active radiation (PAR) provided by LED bulbs, with 4 repetitions, in total of 40 plots. The following variables were set: rate of CO2 assimilation (A), transpiration (E), stomatal conductance (gs), inner CO2 concentration in the substomatic chamber (Ci) and water use efficiency (WUE) in which a portable device of gas exchange was used (Infra-Red Gas Analyzer-IRGA, marca ADC BioScientific Ltd, modelo LC-Pro). Seedlings of soybean positively responded under different intensities of artificial light till reach the maximum saturation point between 1400 and 1600 µmol m-1 s-1 of light, which promoted a better rate of A, Ci andWUE. E and gs presented positive linear responses by increasing the intensity of artificial light. The ideal light intensity to the use of Infra-Red Gas Analyzer-IRGA between 1400 and 1600 µmol m-1 s-1 to the soybean culture.
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Claims 2
Claim · model-written summary
Soybean assimilation, internal carbon dioxide concentration and water use efficiency improved to a saturation point between 1400 and 1600 light units.
- Taxon
- soybean
Glycine maxe0 - Treatment
- different intensities of artificial lighte0
- Outcome
- rate of A, Ci andWUEe0
- Direction
- bettere0
- Value
- between 1400 and 1600 µmol m-1 s-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of soybean positively responded under different intensities of artificial light till reach the maximum saturation point between 1400 and 1600 µmol m-1 s-1 of light, which promoted a better rate of A, Ci andWUE.”
Claim · model-written summary
The authors identify 1400 to 1600 light units as ideal for soybean IRGA measurements.
- Taxon
- soybeanGlycine maxe0
- Outcome
- ideal light intensitye0
- Value
- between 1400 and 1600 µmol m-1 s-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ideal light intensity to the use of Infra-Red Gas Analyzer-IRGA between 1400 and 1600 µmol m-1 s-1 to the soybean culture.”
The same questions in other papers
light · physiology: gas exchange · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- no effect
4 papers more in this group
See all 8 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.