Abstract
The cultivation of spinach (Spinacia oleracea L.) has been increasing during the last years in controlled environment agriculture, where light represents a key factor for controlling plant growth and development and the highest energetic costs. The aim of the experiment was to evaluate the plant's response to two light intensities, corresponding to an optimal and a reduced level, in terms of the photosynthetic process, photoassimilates partitioning, and the biosynthesis of sucrose and starch. Plants of spinach cv. 'Gigante d'Inverno' were grown in a phytotron under controlled conditions, comparing two values of photosynthetic photon flux density (PPFD), 800 μmol m-2 s-1 (800 PPFD) and 200 μmol m-2 s-1 (200 PPFD), at a 10 h light/14 h dark regime. Compared to 800 PPFD, under 200 PPFD, plants showed a reduction in biomass accumulation and a redirection of photoassimilates to leaves, determining a leaf expansion to optimize the light interception, without changes in the photosynthetic process. A shift in carbon partitioning favouring the synthesis of starch, causing an increase in the starch/sucrose ratio at the end of light period, occurred in low-light leaves. The activity of enzymes cFBAse, SPS, and AGPase, involved in the synthesis of sucrose and starch in leaves, decreased under lower light intensity, explaining the rate of accumulation of photoassimilates.
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Claims 5
Claim · model-written summary
At 200 versus 800 PPFD, spinach biomass accumulation fell.
- Taxon
- spinach
Spinacia oleraceat0 - Treatment
- 200 PPFDe0
- Outcome
- biomass accumulatione0
- Direction
- reductione0
- Comparator
- 800 PPFDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spinach (Spinacia oleracea L.)”
e0“Compared to 800 PPFD, under 200 PPFD, plants showed a reduction in biomass accumulation”
Claim · model-written summary
At 200 PPFD, spinach redirected photoassimilates to leaves and expanded leaves.
- Taxon
- spinachSpinacia oleraceat0
- Treatment
- 200 PPFDe1
- Outcome
- redirection of photoassimilates to leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spinach (Spinacia oleracea L.)”
e0“a redirection of photoassimilates to leaves, determining a leaf expansion to optimize the light interception”
e1“under 200 PPFD”
Claim · model-written summary
The photosynthetic process did not change under reduced light.
- Taxon
- spinachSpinacia oleraceat0
- Treatment
- 200 PPFDe1
- Outcome
- photosynthetic processe0
- Direction
- without changese0
- Comparator
- 800 PPFDe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spinach (Spinacia oleracea L.)”
e0“without changes in the photosynthetic process”
e1“under 200 PPFD”
e2“Compared to 800 PPFD”
Claim · model-written summary
Low light favored starch synthesis and increased the starch to sucrose ratio at the end of light.
- Taxon
- spinachSpinacia oleraceat0
- Organ / stage
- leavese0
- Treatment
- low-lighte0
- Outcome
- starch/sucrose ratioe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spinach (Spinacia oleracea L.)”
e0“A shift in carbon partitioning favouring the synthesis of starch, causing an increase in the starch/sucrose ratio at the end of light period, occurred in low-light leaves.”
Claim · model-written summary
Lower light decreased leaf cFBAse, SPS and AGPase activities.
- Taxon
- spinachSpinacia oleraceat0
- Organ / stage
- leavese0
- Treatment
- lower light intensitye0
- Outcome
- activity of enzymes cFBAse, SPS, and AGPasee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spinach (Spinacia oleracea L.)”
e0“The activity of enzymes cFBAse, SPS, and AGPase, involved in the synthesis of sucrose and starch in leaves, decreased under lower light intensity”
The same questions in other papers
light · physiology: enzyme activity · Spinacia oleracea (spinach)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
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