Abstract
Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation. In vitro seed culture was used to study the influence of assimilate supply on the growth and composition of maize endosperm and to determine how various metabolic events in developing endosperm are related to starch accumulation. Immature kernels were grown to maturity on liquid medium containing different concentrations of C (as sucrose) and N (as an amino acid mixture). Endosperm starch and protein syntheses responded to N supply in much the same way as do kernels grown on the intact plant. Protein accumulation was generally independent of sucrose concentration in the medium, while starch synthesis was reduced by low C supply. Extremely low or high concentrations of N also interfered with starch metabolism, possibly through a deficiency in metabolic enzymes or an osmotic imbalance. The relationship between starch and protein accumulation was dependent, at least in appearance, under low N and independent otherwise.
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Claims 7
Claim · model-written summary
Endosperm starch and protein syntheses responded to N supply much as kernels grown on the intact plant did.
- Organ / stage
- Endosperme1
- Treatment
- N supplye1
- Outcome
- Endosperm starch and protein synthesese1
- Comparator
- kernels grown on the intact plante1
Zea maysNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation”
e1“Endosperm starch and protein syntheses responded to N supply in much the same way as do kernels grown on the intact plant”
Claim · model-written summary
Protein accumulation in cultured maize kernels was generally independent of sucrose concentration in the medium.
- Treatment
- sucrose concentration in the mediume2
- Outcome
- Protein accumulatione2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation”
e2“Protein accumulation was generally independent of sucrose concentration in the medium”
Claim · model-written summary
Starch synthesis in cultured maize kernels was reduced by low C (sucrose) supply.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation”
e3“starch synthesis was reduced by low C supply”
Claim · model-written summary
Extremely low or high N concentrations interfered with endosperm starch metabolism.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation”
e4“Extremely low or high concentrations of N also interfered with starch metabolism”
Claim · model-written summary
Interference of N extremes with starch metabolism may act through a deficiency in metabolic enzymes or an osmotic imbalance.
- Outcome
- starch metabolisme4
- Qualifier
- possibly through a deficiency in metabolic enzymes or an osmotic imbalancee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation”
e4“Extremely low or high concentrations of N also interfered with starch metabolism”
e5“possibly through a deficiency in metabolic enzymes or an osmotic imbalance”
Claim · model-written summary
The relationship between starch and protein accumulation was dependent, at least in appearance, under low N.
- Treatment
- low Ne6
- Outcome
- relationship between starch and protein accumulatione6
- Qualifier
- at least in appearancee6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation”
e6“The relationship between starch and protein accumulation was dependent, at least in appearance, under low N and independent otherwise”
Claim · model-written summary
Otherwise, starch and protein accumulation were independent of each other.
- Outcome
- relationship between starch and protein accumulatione6
- Qualifier
- independent otherwisee6
- Comparator
- low Ne6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) kernel growth and grain yield are functions of endosperm starch accumulation”
e6“The relationship between starch and protein accumulation was dependent, at least in appearance, under low N and independent otherwise”
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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.