Abstract
Competition between grain and roots for photoassimilates may reduce post‐anthesis N uptake (N a ), thereby limiting grain production of prolific maize ( Zea mays L.). Field experiments were conducted to determine if this competition was minimized during the selection for new high‐yielding prolific lines, providing a plausible physiological explanation for the improved grain yields. The dry matter (DM) and N accumulation and partitioning of two high‐yielding and three low‐yielding prolifics were compared under full pollination, limited pollination of the apical ear, or no pollination. The following year, one high‐yielding and one low‐yielding hybrid were grown at 34 000 and 45 000 plants ha −1 . Fully pollinated, high‐yielding hybrids averaged 74% more grain weight (G w ) than low‐yielding hybrids. A highyielding hybrid produced 71% more G w under full pollination than with apical ears only pollinated, while limiting pollination had little effect on low‐yielding hybrids. Greater contributions of subapical ears in new prolifics were attributed to greater kernel weight and number, which were positively correlated with post‐anthesis DM accumulation (T wa ). The DM partitioning to vegetative tissue [T wa − G w ] is indicator of photosynthate availability for plant functions during grain‐filling. Greater [T wa − G w ] occurred at the low plant density and with limited pollination, and this was positively related to N a while inversely related to N r . The high‐yielding hybrids maintained T a and Na during multiple ear development. These results suggest N a is regulated by the ear sink size relative to photosynthate supply.
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Claims 10
Claim · model-written summary
Fully pollinated high-yielding maize hybrids had 74% more grain weight than low-yielding hybrids.
- Material
- high-yielding hybridse1
- Treatment
- Fully pollinatede1
- Outcome
- grain weighte1
- Direction
- moree1
- Value
- 74%e1
- Comparator
- low-yielding hybridse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e1“Fully pollinated, high-yielding hybrids averaged 74% more grain weight (G w ) than low-yielding hybrids”
Claim · model-written summary
A high-yielding maize hybrid had 71% more G w under full pollination than with only apical ears pollinated.
- Material
- highyielding hybride2
- Treatment
- full pollinatione2
- Outcome
- G we2
- Direction
- moree2
- Value
- 71%e2
- Comparator
- apical ears only pollinatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e2“A highyielding hybrid produced 71% more G w under full pollination than with apical ears only pollinated”
Claim · model-written summary
Limiting pollination had little effect on low-yielding maize hybrids.
- Material
- low-yielding hybridse3
- Treatment
- limiting pollinatione3
- Outcome
- effecte3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e3“while limiting pollination had little effect on low-yielding hybrids”
Claim · model-written summary
The composite [T wa − G w ] was greater at low plant density.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e4“Greater [T wa − G w ] occurred at the low plant density and with limited pollination”
Claim · model-written summary
The composite [T wa − G w ] was greater with limited pollination.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e4“Greater [T wa − G w ] occurred at the low plant density and with limited pollination”
Claim · model-written summary
The composite [T wa − G w ] was positively related to N a uptake after anthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e4“Greater [T wa − G w ] occurred at the low plant density and with limited pollination”
e5“this was positively related to N a while inversely related to N r”
Claim · model-written summary
The composite [T wa − G w ] was inversely related to N r.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e4“Greater [T wa − G w ] occurred at the low plant density and with limited pollination”
e5“this was positively related to N a while inversely related to N r”
Claim · model-written summary
Greater kernel weight and number were positively correlated with post-anthesis DM accumulation in maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e6“greater kernel weight and number, which were positively correlated with post‐anthesis DM accumulation (T wa )”
Claim · model-written summary
High-yielding maize hybrids maintained T a and Na during multiple ear development.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e7“The high‐yielding hybrids maintained T a and Na during multiple ear development. These results suggest N a is regulated by the ear sink size relative to photosynthate supply”
Claim · model-written summary
Nitrogen uptake after anthesis is regulated by ear sink size relative to photosynthate supply, according to the authors.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting grain production of prolific maize ( Zea mays L.)”
e7“The high‐yielding hybrids maintained T a and Na during multiple ear development. These results suggest N a is regulated by the ear sink size relative to photosynthate supply”