Abstract
The percentage of soybean [ Glycine max (L.) Merr.] reproductive structures that abscise is a potentially important yield factor. To better understand the involvement of light in the abscission of reproductive structures, a series of in vitro raceme‐culture and growthchamber experiments were conducted. In the in vitro raceme‐culture experiments, racemes with four to six flowers at or past anthesis were excised from the soybean plant (genotype 1X93‐100), embedded in a complete nutrient, solid agar medium, and subjected to various light treatments. A series of three experiments indicated that the racemes contain a photoreceptor, possibly phytochrome, capable of regulating sucrose accumulation. In each of the growth chamber studies, supplemental light was supplied directly to individual soybean flowers via fiber optic light guides. The light source (a tungsten filament bulb) increased the photon flux to the flowers by 10‐fold. The first growth chamber experiment showed that flowers receiving supplemental light were more intense sinks for 14 C‐sucrose than were controls (intensity value of 1.0 vs. 0.4 ✕ 10 −7 , intensity = [dps of flower/dps of raceme]/[kg dry wt of flower]). In a second study, 42% of flowers treated with supplemental light set pods, while only 26% of control flowers set pods. A third experiment showed that red supplemental light produced 55% fruit set, compared to 41% set for far‐red light, and 35% for controls (far‐red not statistically different than control, but all other comparisons are significantly different). These experiments indicate that both photoassimilate accumulation and abscission in young soybean reproductive structures may be regulated by light quality.
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Claims 7
Claim · model-written summary
Soybean racemes appeared to contain a photoreceptor capable of regulating sucrose accumulation.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- racemese0
- Gene
- phytochromee0
- Outcome
- sucrose accumulatione0
- Qualifier
- possibly phytochromee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the racemes contain a photoreceptor, possibly phytochrome, capable of regulating sucrose accumulation”
t0“soybean”
Claim · model-written summary
Supplementally lit soybean flowers were stronger sinks for 14 C-sucrose than controls.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- flowerse0
- Treatment
- supplemental lighte0
- Outcome
- more intense sinks for 14 C‐sucrosee0
- Direction
- more intensee0
- Value
- 1.0 vs. 0.4 ✕ 10 −7e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“flowers receiving supplemental light were more intense sinks for 14 C‐sucrose than were controls (intensity value of 1.0 vs. 0.4 ✕ 10 −7”
t0“Soybean”
Claim · model-written summary
Supplemental light increased soybean flower pod set to 42%, versus 26% in controls.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- flowerse0
- Treatment
- supplemental lighte0
- Outcome
- set podse0
- Direction
- 42% of flowers treated with supplemental light set pods, while only 26% of control flowers set podse0
- Value
- 42%e0
- Comparator
- control flowerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“42% of flowers treated with supplemental light set pods, while only 26% of control flowers set pods”
t0“Soybean”
Claim · model-written summary
Red supplemental light produced 55% fruit set versus 41% with far-red light.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- red supplemental lighte0
- Outcome
- fruit sete0
- Direction
- 55% fruit set, compared to 41%e0
- Value
- 55%e0
- Comparator
- far‐red lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“red supplemental light produced 55% fruit set, compared to 41% set for far‐red light, and 35% for controls (far‐red not statistically different than control, but all other comparisons are significantly different)”
t0“Soybean”
Claim · model-written summary
Red supplemental light produced 55% fruit set versus 35% in controls.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- red supplemental lighte0
- Outcome
- fruit sete0
- Direction
- 55% fruit set, compared to 41% set for far‐red light, and 35% for controlse0
- Value
- 55%e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“red supplemental light produced 55% fruit set, compared to 41% set for far‐red light, and 35% for controls (far‐red not statistically different than control, but all other comparisons are significantly different)”
t0“Soybean”
Claim · model-written summary
Far-red light produced 41% fruit set, versus 35% in controls, without a significant difference.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- far‐red lighte0
- Outcome
- sete0
- Direction
- 41% set for far‐red light, and 35% for controlse0
- Value
- 41%e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“41% set for far‐red light, and 35% for controls (far‐red not statistically different than control”
t0“Soybean”
Claim · model-written summary
Light quality may regulate photoassimilate accumulation and abscission in young soybean reproductive structures.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- young soybean reproductive structurese0
- Outcome
- photoassimilate accumulation and abscissione0
- Qualifier
- light qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both photoassimilate accumulation and abscission in young soybean reproductive structures may be regulated by light quality”
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See all 71 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.