Abstract
Two cultivars ZD958 and DH661 were used to analyze the effect of different planting densities (45 000 plant ha–1, 75 000 plant ha?1, 10 5000 plant ha?1) on kernel development and barrenness in maize (Zea mays L.). The results showed that increasing plant density had little effects on the time of ear primordia differentiation (the ear primordia presented at 28–29 days after sowing under different densities) and the total number of floret primordia during silking. However, the differentiation of ear was postponed under high density, the number of abortive florets and unfertilized florets increased with the increase of plant density. Compared with low-density, the high density reduced number of normal florets per ear by 100.0 for DH661 and by 76.4 for ZD958. Additionally, the anthesis-silking interval (ASI) was elongated, the ratio of the silked-plants was decreased (ratio of DH661 was 93.64% and that of ZD958 was 81.80% under high density), the time of silking was delayed, the number of silked florets per ear was reduced and the pollen shedding duration was shortened with increasing plant density, which results in the increment of abortion after fertilization. Interestingly, kernel abortion would also occur during grain-filling, especially in 10 days after anthesis. The kernel number per ear had a positive correlation with the bottom transmittance at silking, 10 d after silking and 20 d after silking, while the ratio of abortive floret was negatively correlated with the bottom transmittance before flowering significantly.
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Claims 19
Claim · model-written summary
Increasing density had little effect on timing of ear-primordium differentiation, which occurred at 28–29 days.
- Treatment
- increasing plant densitye0
- Outcome
- time of ear primordia differentiatione0
- Direction
- little effectse0
- Value
- 28–29 days after sowinge0
- Comparator
- different densitiese0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing plant density had little effects on the time of ear primordia differentiation (the ear primordia presented at 28–29 days after sowing under different densities)”
t0“maize (Zea mays L.)”
Claim · model-written summary
Increasing density had little effect on total floret primordia at silking.
- Treatment
- increasing plant densitye0
- Outcome
- total number of floret primordia during silkinge0
- Direction
- little effectse0
- Comparator
- different densitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing plant density had little effects on the time of ear primordia differentiation (the ear primordia presented at 28–29 days after sowing under different densities) and the total number of floret primordia during silking.”
t0“maize (Zea mays L.)”
Claim · model-written summary
High density delayed ear differentiation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the differentiation of ear was postponed under high density”
t0“maize (Zea mays L.)”
Claim · model-written summary
Abortive florets increased as planting density rose.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of abortive florets and unfertilized florets increased with the increase of plant density.”
t0“maize (Zea mays L.)”
Claim · model-written summary
Unfertilized florets increased as planting density rose.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of abortive florets and unfertilized florets increased with the increase of plant density.”
t0“maize (Zea mays L.)”
Claim · model-written summary
High density reduced normal florets per ear in DH661 by 100.0.
- Material
- DH661e0
- Treatment
- high densitye0
- Outcome
- number of normal florets per eare0
- Direction
- reducede0
- Value
- 100.0e0
- Comparator
- low-densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with low-density, the high density reduced number of normal florets per ear by 100.0 for DH661”
t0“maize (Zea mays L.)”
Claim · model-written summary
High density reduced normal florets per ear in ZD958 by 76.4.
- Material
- ZD958e0
- Treatment
- high densitye0
- Outcome
- number of normal florets per eare0
- Direction
- reducede0
- Value
- 76.4e0
- Comparator
- low-densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with low-density, the high density reduced number of normal florets per ear by 100.0 for DH661 and by 76.4 for ZD958.”
t0“maize (Zea mays L.)”
Claim · model-written summary
The anthesis-silking interval lengthened with density.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the anthesis-silking interval (ASI) was elongated”
t0“maize (Zea mays L.)”
Claim · model-written summary
The proportion of silked DH661 plants fell to 93.64% at high density.
- Material
- DH661e0
- Treatment
- high densitye0
- Outcome
- ratio of the silked-plantse0
- Direction
- decreasede0
- Value
- 93.64%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio of the silked-plants was decreased (ratio of DH661 was 93.64% and that of ZD958 was 81.80% under high density)”
t0“maize (Zea mays L.)”
Claim · model-written summary
The proportion of silked ZD958 plants fell to 81.80% at high density.
- Material
- ZD958e0
- Treatment
- high densitye0
- Outcome
- ratio of the silked-plantse0
- Direction
- decreasede0
- Value
- 81.80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio of the silked-plants was decreased (ratio of DH661 was 93.64% and that of ZD958 was 81.80% under high density)”
t0“maize (Zea mays L.)”
Claim · model-written summary
Silking occurred later as planting density increased.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the time of silking was delayed”
t0“maize (Zea mays L.)”
Claim · model-written summary
Silked florets per ear decreased with planting density.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of silked florets per ear was reduced”
t0“maize (Zea mays L.)”
Claim · model-written summary
Pollen-shedding duration shortened with planting density.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pollen shedding duration was shortened with increasing plant density”
t0“maize (Zea mays L.)”
Claim · model-written summary
The authors attribute greater postfertilization abortion to density-associated reproductive changes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which results in the increment of abortion after fertilization.”
t0“maize (Zea mays L.)”
Claim · model-written summary
Kernel abortion also occurred during grain filling, especially within 10 days after anthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kernel abortion would also occur during grain-filling, especially in 10 days after anthesis.”
t0“maize (Zea mays L.)”
Claim · model-written summary
Kernel number per ear correlated positively with bottom transmittance at silking.
- Outcome
- kernel number per eare0
- Direction
- positive correlatione0
- Qualifier
- at silkinge0
- Comparator
- bottom transmittancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The kernel number per ear had a positive correlation with the bottom transmittance at silking, 10 d after silking and 20 d after silking”
t0“maize (Zea mays L.)”
Claim · model-written summary
Kernel number per ear correlated positively with bottom transmittance 10 days after silking.
- Outcome
- kernel number per eare0
- Direction
- positive correlatione0
- Qualifier
- 10 d after silkinge0
- Comparator
- bottom transmittancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The kernel number per ear had a positive correlation with the bottom transmittance at silking, 10 d after silking and 20 d after silking”
t0“maize (Zea mays L.)”
Claim · model-written summary
Kernel number per ear correlated positively with bottom transmittance 20 days after silking.
- Outcome
- kernel number per eare0
- Direction
- positive correlatione0
- Qualifier
- 20 d after silkinge0
- Comparator
- bottom transmittancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The kernel number per ear had a positive correlation with the bottom transmittance at silking, 10 d after silking and 20 d after silking”
t0“maize (Zea mays L.)”
Claim · model-written summary
Abortive-floret ratio correlated negatively and significantly with bottom transmittance before flowering.
- Outcome
- ratio of abortive florete0
- Direction
- negatively correlatede0
- Qualifier
- before floweringe0
- Comparator
- bottom transmittancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio of abortive floret was negatively correlated with the bottom transmittance before flowering significantly.”
t0“maize (Zea mays L.)”