Abstract
Abstract Knowledge about the interactive effects of N and drought stresses on corn ( Zea mays L.) root morphology and rate of N uptake is important for selecting drought tolerant and/or N efficient genotypes and for determining mechanisms that control root growth under stress. The objective was to study these interactions by growing three and four genotypes of known N utilization efficiency (NUE, kg grain/kg N uptake) responses in greenhouse and field experiments, respectively. Nitrogen application rates were 0, 30, 60, and 90 mg N kg −1 soil in the greenhouse and 0, 60, 120, and 180 kg N ha −1 in the field experiment. Water regimes included nonstress vs. an 8‐d water stress in the greenhouse experiment and dryland vs. irrigation in the field. Water‐regime‐by‐N‐rate interactions were not significant for root dry weight, length, average radius, root/shoot ratio, and N influx in either environment. Root weight and length were different among genotypes. The genotype with the greatest amount of roots deep in the soil had the highest grain yield increase with irrigation. Root mass and root length were greater, but mean N influx was two to three times smaller in the zero N treatment than in the applied N treatments (average of all genotypes). Severe water stress reduced corn root mass and length in the greenhouse. Moderate water stress in the field, however, significantly increased root length. Water use efficiency was positively correlated with root mass and length in the greenhouse. Water regime did not affect N influx in either experiment. These results showed that corn response to irrigation will be altered depending on root morphology, and that insofar as possible, the root system should be considered when selecting for N efficient and/or drought tolerant corn genotypes
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Claims 12
Claim · model-written summary
Water-regime-by-N-rate interactions were not significant for root dry weight, length and average radius in either environment.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- Water‐regime‐by‐N‐rate interactionse0
- Outcome
- root dry weight, length, average radiuse0
- Direction
- not significante0
- Setting
- either environmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water‐regime‐by‐N‐rate interactions were not significant for root dry weight, length, average radius, root/shoot ratio, and N influx in either environment”
t0“Corn Genotypes”
Claim · model-written summary
Water-regime-by-N-rate interactions were not significant for root/shoot ratio and N influx in either environment.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Water‐regime‐by‐N‐rate interactionse0
- Outcome
- root/shoot ratio, and N influxe0
- Direction
- not significante0
- Setting
- either environmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water‐regime‐by‐N‐rate interactions were not significant for root dry weight, length, average radius, root/shoot ratio, and N influx in either environment”
t0“Corn Genotypes”
Claim · model-written summary
Root weight and root length differed among corn genotypes.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Root weight and lengthe0
- Qualifier
- different among genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root weight and length were different among genotypes”
t0“Corn Genotypes”
Claim · model-written summary
The corn genotype with the greatest amount of roots deep in the soil had the highest grain yield increase with irrigation.
- Taxon
- CornZea mays subsp. mayst0
- Material
- genotype with the greatest amount of roots deep in the soile0
- Treatment
- irrigatione0
- Outcome
- grain yield increasee0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genotype with the greatest amount of roots deep in the soil had the highest grain yield increase with irrigation”
t0“Corn Genotypes”
Claim · model-written summary
Root mass and root length of corn were greater in the zero N treatment than in the applied N treatments.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- zero N treatmente0
- Outcome
- Root mass and root lengthe0
- Direction
- greatere0
- Comparator
- applied N treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root mass and root length were greater, but mean N influx was two to three times smaller in the zero N treatment than in the applied N treatments”
t0“Corn Genotypes”
Claim · model-written summary
Mean N influx of corn was two to three times smaller in the zero N treatment than in the applied N treatments.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- zero N treatmente0
- Outcome
- mean N influxe0
- Direction
- smallere0
- Value
- two to three timese0
- Comparator
- applied N treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root mass and root length were greater, but mean N influx was two to three times smaller in the zero N treatment than in the applied N treatments”
t0“Corn Genotypes”
Claim · model-written summary
Severe water stress reduced corn root mass and length in the greenhouse.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Severe water stresse0
- Outcome
- root mass and lengthe0
- Direction
- reducede0
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe water stress reduced corn root mass and length in the greenhouse”
Claim · model-written summary
Moderate water stress in the field significantly increased corn root length.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Moderate water stresse0
- Outcome
- root lengthe0
- Direction
- increasede0
- Setting
- fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderate water stress in the field, however, significantly increased root length”
t0“Corn Genotypes”
Claim · model-written summary
Water use efficiency of corn was positively correlated with root mass and length in the greenhouse.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- root mass and lengthe0
- Outcome
- Water use efficiencye0
- Direction
- positively correlatede0
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency was positively correlated with root mass and length in the greenhouse”
t0“Corn Genotypes”
Claim · model-written summary
Water regime did not affect N influx of corn in either experiment.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Water regimee0
- Outcome
- N influxe0
- Direction
- did not affecte0
- Setting
- either experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water regime did not affect N influx in either experiment”
t0“Corn Genotypes”
Claim · model-written summary
The authors conclude that corn response to irrigation will be altered depending on root morphology.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- root morphologye0
- Treatment
- irrigatione0
- Outcome
- response to irrigatione0
- Direction
- alterede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn response to irrigation will be altered depending on root morphology”
t0“Corn Genotypes”
Claim · model-written summary
The authors recommend considering the root system when selecting N efficient and/or drought tolerant corn genotypes.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- root system should be considered when selecting for N efficient and/or drought tolerant corn genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the root system should be considered when selecting for N efficient and/or drought tolerant corn genotypes”
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See all 385 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.