Abstract
Changes in quality factors during seed maturation were examined in yellow smooth-seeded field peas (Pisum sativum L. ’Trapper’) under different nitrogen (N) regimes. Sucrose was the sole oligosaccharide (17% of dry weight) at 15 days post-anthesis, but at full seed maturity (80 days post-anthesis) had decreased to 2.2% of seed dry weight. At maturity, raffinose, stachyose, and verbascose content had reached concentrations of 0.6, 1.8, and 2.3%, respectively. Total oligosaccharide content remained constant regardless of variation in seed protein concentration, and was unaffected by applications of N fertilizer. Seed protein (%) was found to be variable and positively correlated with N fertilizer treatments. Seed protein (dry basis) decreased during seed maturation. This decrease was most evident in the absence of added N fertilizer. Symbiotic fixation (acetylene reduction) was low in all treatments and made little contribution to plant N content. Fixation in the absence of added N was insufficient to maintain seed N at levels comparable to those observed in the high-N fertilizer treatments. The constancy of oligosaccharide content under the different fertilizer regimes indicated that the content of these components might be more amenable to genetic manipulation via selection rather than by varying management practices.
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Claims 13
Claim · model-written summary
At 15 days after anthesis sucrose was the only oligosaccharide, at 17% of dry weight.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“Sucrose was the sole oligosaccharide (17% of dry weight) at 15 days post-anthesis”
Claim · model-written summary
Seed sucrose declined to 2.2% of dry weight at full maturity.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“at full seed maturity (80 days post-anthesis) had decreased to 2.2% of seed dry weight”
Claim · model-written summary
Mature seed raffinose content reached 0.6%.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“At maturity, raffinose, stachyose, and verbascose content had reached concentrations of 0.6, 1.8, and 2.3%, respectively”
Claim · model-written summary
Mature seed stachyose content reached 1.8%.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“At maturity, raffinose, stachyose, and verbascose content had reached concentrations of 0.6, 1.8, and 2.3%, respectively”
Claim · model-written summary
Mature seed verbascose content reached 2.3%.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“At maturity, raffinose, stachyose, and verbascose content had reached concentrations of 0.6, 1.8, and 2.3%, respectively”
Claim · model-written summary
Total oligosaccharide content stayed constant despite variation in seed protein.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“Total oligosaccharide content remained constant regardless of variation in seed protein concentration”
Claim · model-written summary
Nitrogen fertilizer did not affect total oligosaccharide content.
- Taxon
- field pease0
- Material
- ’Trapper’e0
- Treatment
- N fertilizere1
- Outcome
- Total oligosaccharide contente1
- Direction
- unaffectede1
Not reportedComparator
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“Total oligosaccharide content remained constant regardless of variation in seed protein concentration, and was unaffected by applications of N fertilizer”
Claim · model-written summary
Seed protein percentage increased with nitrogen fertilizer treatment.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“Seed protein (%) was found to be variable and positively correlated with N fertilizer treatments”
Claim · model-written summary
Seed protein dry basis decreased during maturation.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“Seed protein (dry basis) decreased during seed maturation”
Claim · model-written summary
The seed protein decrease was strongest without added nitrogen.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“This decrease was most evident in the absence of added N fertilizer”
Claim · model-written summary
Symbiotic nitrogen fixation was low in all treatments and contributed little to plant nitrogen.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“Symbiotic fixation (acetylene reduction) was low in all treatments and made little contribution to plant N content”
Claim · model-written summary
Without added nitrogen, fixation was insufficient to sustain seed nitrogen at high-fertilizer levels.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“Fixation in the absence of added N was insufficient to maintain seed N at levels comparable to those observed in the high-N fertilizer treatments”
Claim · model-written summary
The authors infer that selection may alter oligosaccharide content more readily than fertilizer management.
Verbatim
e0“field peas (Pisum sativum L. ’Trapper’)”
e1“the content of these components might be more amenable to genetic manipulation via selection rather than by varying management practices”
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See all 13 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.