Abstract
The objectives of this work were to study the genetic control of grain yield (GY) and nitrogen (N) use efficiency (NUE, grain yield/N applied) and its primary components, N uptake efficiency (NUpE, N uptake/N applied) and N utilization efficiency (NUtE, grain yield/N uptake), in maize grown in environments with high and low N availability. Experiments with 31 maize genotypes (28 hybrid crosses and three controls) were carried out in soils with high and low N rates, in the southeast of the state of Minas Gerais, Brazil. There was a reduction of 23.2% in average GY for maize grown in soil with low N, in comparison to that obtained with high N. There were 26.5, 199 and 400% increases in NUtE, NUpE, and NUE, respectively, for maize grown with low N. The general combining ability (GCA) and specific combining ability (SCA) were significant for GY, NUE and NUpE for maize grown in high N soil. Only GCA was significant for NUpE for maize grown in low N soil. The GCA and SCA for NUtE were not significant in either environment. Additive and non-additive genetic effects are responsible for the genetic control of NUE and GY for maize grown in soils with high N availability, although additive effects are more important.
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Claims 9
Claim · model-written summary
Low nitrogen reduced average maize grain yield by 23.2% versus high nitrogen.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a reduction of 23.2% in average GY for maize grown in soil with low N, in comparison to that obtained with high N.”
Claim · model-written summary
Low nitrogen increased maize nitrogen utilization efficiency by 26.5%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 26.5, 199 and 400% increases in NUtE, NUpE, and NUE, respectively, for maize grown with low N.”
e1“in maize grown in environments with high and low N availability”
Claim · model-written summary
Low nitrogen increased maize nitrogen uptake efficiency by 199%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 26.5, 199 and 400% increases in NUtE, NUpE, and NUE, respectively, for maize grown with low N.”
e1“in maize grown in environments with high and low N availability”
Claim · model-written summary
Low nitrogen increased maize nitrogen use efficiency by 400%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 26.5, 199 and 400% increases in NUtE, NUpE, and NUE, respectively, for maize grown with low N.”
e1“in maize grown in environments with high and low N availability”
Claim · model-written summary
General combining ability was significant for grain yield, nitrogen use efficiency and nitrogen uptake efficiency under high nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The general combining ability (GCA) and specific combining ability (SCA) were significant for GY, NUE and NUpE for maize grown in high N soil.”
Claim · model-written summary
Specific combining ability was significant for grain yield, nitrogen use efficiency and nitrogen uptake efficiency under high nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The general combining ability (GCA) and specific combining ability (SCA) were significant for GY, NUE and NUpE for maize grown in high N soil.”
Claim · model-written summary
Only general combining ability was significant for nitrogen uptake efficiency under low nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only GCA was significant for NUpE for maize grown in low N soil.”
Claim · model-written summary
General and specific combining ability for nitrogen utilization efficiency were not significant in either nitrogen environment.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The GCA and SCA for NUtE were not significant in either environment.”
e1“maize grown in environments with high and low N availability”
Claim · model-written summary
Both additive and non-additive genetic effects controlled nitrogen use efficiency and grain yield under high nitrogen, with additive effects more important.
- Outcome
- genetic control of NUE and GYe0
- Qualifier
- additive effects are more importante0
- Setting
- soils with high N availabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additive and non-additive genetic effects are responsible for the genetic control of NUE and GY for maize grown in soils with high N availability, although additive effects are more important.”
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