Abstract
Maize grain yield is closely associated with kernel number at maturity,and kernel number is affected by apical kernel abortion mainly occurred at early kernel filling stage.Improving apical kernel development and reducing apical kernel abortion can contribute to increment of kernels per ear.The objectives of this work were to evaluate the effect of nitrogen supply on early kernel development and grain yield in maize.In field condition,early development of apical kernel in summer maize hybrid Zhengdan 958 and its grain yield under different nitrogen supplies(0,120,180 and 240 kg/ha) and the activities of enzymes related to kernel development such as acid sucrose invertase(AI),neutral sucrose invertase (NI),sucrose synthase(SS),ADPGase and starch synthase were determined.The results showed that suitable nitrogen supply obviously increased the activities of enzymes above and promoted apical kernel development.At 520 days after pollination(DAP),higher activities of AI,NI,SS,ADPGase and starch synthase in apical kernel were obtained under nitrogen supply of 180 kg/ha,indicating the sucrose utilization and starch synthesis were improved.The fresh weight,size,dry weigh,the contents of soluble sugar,nitrogen and starch in apical kernel in 520 DAP were higher under nitrogen supply of 180 kg/ha than under other nitrogen rates.With increasing supply of nitrogen ranging from 0 to 180 kg/ha,the kernel development were promoted and the kernel abortion were reduced which resulted in more kernels per ear and higher yield.Nitrogen deficiency or excessiveness affected apical kernel development,which resulted in higher kernel abortion and lower grain yield.
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Claims 9
Claim · model-written summary
Suitable nitrogen supply increased activities of enzymes related to kernel development.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suitable nitrogen supply obviously increased the activities of enzymes above and promoted apical kernel development”
t0“Maize”
Claim · model-written summary
Suitable nitrogen supply promoted apical kernel development.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suitable nitrogen supply obviously increased the activities of enzymes above and promoted apical kernel development”
t0“Maize”
Claim · model-written summary
At 180 kg/ha nitrogen, apical kernel invertase, sucrose synthase, ADPGase and starch synthase activities were higher.
- Treatment
- nitrogen supply of 180 kg/hae0
- Outcome
- activities of AI,NI,SS,ADPGase and starch synthasee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher activities of AI,NI,SS,ADPGase and starch synthase in apical kernel were obtained under nitrogen supply of 180 kg/ha”
t0“Maize”
Claim · model-written summary
Apical kernel fresh weight, size and dry weight were higher at 180 kg/ha nitrogen than other rates.
- Treatment
- nitrogen supply of 180 kg/hae0
- Outcome
- fresh weight,size,dry weighe0
- Direction
- highere0
- Comparator
- other nitrogen ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fresh weight,size,dry weigh,the contents of soluble sugar,nitrogen and starch in apical kernel in 520 DAP were higher under nitrogen supply of 180 kg/ha than under other nitrogen rates”
t0“Maize”
Claim · model-written summary
Apical kernel soluble sugar, nitrogen and starch contents were higher at 180 kg/ha nitrogen than other rates.
- Treatment
- nitrogen supply of 180 kg/hae0
- Outcome
- contents of soluble sugar,nitrogen and starche0
- Direction
- highere0
- Comparator
- other nitrogen ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fresh weight,size,dry weigh,the contents of soluble sugar,nitrogen and starch in apical kernel in 520 DAP were higher under nitrogen supply of 180 kg/ha than under other nitrogen rates”
t0“Maize”
Claim · model-written summary
Nitrogen increases up to 180 kg/ha promoted kernel development and reduced abortion.
- Treatment
- increasing supply of nitrogen ranging from 0 to 180 kg/hae0
- Outcome
- kernel developmente0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing supply of nitrogen ranging from 0 to 180 kg/ha,the kernel development were promoted and the kernel abortion were reduced”
t0“Maize”
Claim · model-written summary
Increasing nitrogen to 180 kg/ha reduced kernel abortion.
- Treatment
- increasing supply of nitrogen ranging from 0 to 180 kg/hae0
- Outcome
- kernel abortione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing supply of nitrogen ranging from 0 to 180 kg/ha,the kernel development were promoted and the kernel abortion were reduced”
t0“Maize”
Claim · model-written summary
Increasing nitrogen up to 180 kg/ha resulted in more kernels per ear and higher yield.
- Treatment
- increasing supply of nitrogen ranging from 0 to 180 kg/hae0
- Outcome
- kernels per ear and higher yielde0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing supply of nitrogen ranging from 0 to 180 kg/ha,the kernel development were promoted and the kernel abortion were reduced which resulted in more kernels per ear and higher yield”
t0“Maize”
Claim · model-written summary
Nitrogen deficiency or excess was associated with increased kernel abortion and lower grain yield.
- Treatment
- Nitrogen deficiency or excessivenesse0
- Outcome
- kernel abortion and lower grain yielde0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency or excessiveness affected apical kernel development,which resulted in higher kernel abortion and lower grain yield”
t0“Maize”
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