Abstract
Demand for soybean [ Glycine max (L.) Merr.] with modified oil composition has led to the development of new soybean cultivars with reduced levels of linolenic acid. The objective of this study was to determine the effect of plant density on linolenic acid of soybean bred to have reduced linolenic acid concentration (≤30 g kg −1 , low‐linolenic) and of traditional soybean cultivars (≈70 g kg −1 , high‐linolenic). Low‐linolenic and high‐linolenic soybean cultivars were planted at four seeding rates of 185,300; 308,900; 432,400; and 556,000 seeds ha −1 at two Iowa locations in 2007 and 2008. Seeding rates did not influence linolenic acid concentration. No yield difference was observed between high‐linolenic and low‐linolenic cultivars. A 155 kg ha −1 yield loss was observed for both low‐linolenic and high‐linolenic cultivars at the 185,300 seeds ha −1 seeding rate. Across cultivars, seed mass of mainstem seed was greater than seed mass of branch seed at all seeding rates except the 185,300 seeds ha −1 rate. Regardless of cultivars, increasing plant density had the effect of increasing mainstem seed protein and decreasing mainstem seed oil. Linolenic acid concentration was greater for branch seeds compared with mainstem seeds and the effect was similar between cultivars and seeding rates. Greater linolenic acid concentration for branch seeds was not sufficient to modify the linolenic concentration of the entire seed pool because branch seeds contribute a smaller portion of the total seed mass. These data suggest that low‐linolenic and high‐linolenic cultivars respond similarly to changing seeding rates both in yield and linolenic acid concentration.
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Claims 8
Claim · model-written summary
Seeding rate did not influence linolenic acid concentration.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Seeding ratese0
- Outcome
- linolenic acid concentratione0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeding rates did not influence linolenic acid concentration.”
t0“soybean”
Claim · model-written summary
Yield did not differ between high- and low-linolenic cultivars.
- Taxon
- soybeanGlycine maxt0
- Material
- high‐linolenic and low‐linolenic cultivarse0
- Outcome
- yield differencee0
- Direction
- No yield differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No yield difference was observed between high‐linolenic and low‐linolenic cultivars.”
t0“soybean”
Claim · model-written summary
The lowest seeding rate produced a 155 kg ha−1 yield loss in both cultivar types.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 185,300 seeds ha −1 seeding ratee0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 155 kg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 155 kg ha −1 yield loss was observed for both low‐linolenic and high‐linolenic cultivars at the 185,300 seeds ha −1 seeding rate.”
t0“soybean”
Claim · model-written summary
Mainstem seed mass exceeded branch seed mass except at the lowest rate.
- Taxon
- soybeanGlycine maxt0
- Outcome
- seed mass of mainstem seede0
- Direction
- greatere0
- Qualifier
- except the 185,300 seeds ha −1 ratee0
- Comparator
- seed mass of branch seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed mass of mainstem seed was greater than seed mass of branch seed at all seeding rates except the 185,300 seeds ha −1 rate.”
t0“soybean”
Claim · model-written summary
Greater plant density increased mainstem seed protein.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing plant densitye0
- Outcome
- mainstem seed proteine0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing plant density had the effect of increasing mainstem seed protein”
t0“soybean”
Claim · model-written summary
Greater plant density decreased mainstem seed oil.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing plant densitye0
- Outcome
- mainstem seed oile0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing plant density had the effect of increasing mainstem seed protein and decreasing mainstem seed oil.”
t0“soybean”
Claim · model-written summary
Branch seeds had more linolenic acid than mainstem seeds, similarly across cultivars and rates.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- branch seedse0
- Outcome
- Linolenic acid concentratione0
- Direction
- greatere0
- Comparator
- mainstem seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Linolenic acid concentration was greater for branch seeds compared with mainstem seeds and the effect was similar between cultivars and seeding rates.”
t0“soybean”
Claim · model-written summary
Branch seed linolenic acid did not alter whole-pool concentration because branch seed mass was smaller.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- branch seedse0
- Outcome
- linolenic concentration of the entire seed poole0
- Qualifier
- branch seeds contribute a smaller portion of the total seed masse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater linolenic acid concentration for branch seeds was not sufficient to modify the linolenic concentration of the entire seed pool because branch seeds contribute a smaller portion of the total seed mass.”
t0“soybean”
The same questions in other papers
density · quality: oil · Glycine max (soybean)Positive and negative results
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See all 305 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.