Abstract
In order to investigate effects of limited NO 3 availability in corn ( Zea mays L. cv. Brulouis) 17‐day‐old plants were grown for a further 25 days on sand in a growth chamber. The plants received frequent irrigation with a complete nutrient solution containing 0.2, 0.6, 1.5 or 3.0 mM NO 3 . With 0.2 mM NO; nitrate levels in both roots and leaves diminished rapidly and were almost zero after 10 days treatment. Concurrently, as signs of nitrogen deficiency appeared, shoot growth was restricted, whereas root growth was enhanced. In addition, the concentration of reduced nitrogen and malate in the leaves declined, and in vitro nitrate reductase activity (NRA. EC 1.6.6.1), soluble protein and chlorophyll levels of leaf tissue were depressed and starch concentration was enhanced. With 0.6 mM NO 3 in the nutrient solution, the decrease in NO 3 levels in the tissues and the increase in root development were similar to those observed with 0.2 mM NO 3 . However, shoot growth, reduced nitrogen concentration in leaves, and the above‐mentioned biochemical characteristics were almost identical to those obtained at 1.5 and 3.0 mM NO 3 . This indicates that when supplied with 0.6 mM NO 3 , corn plants were able to absorb sufficient NO3 to support maximal biomass production without appreciable NO 3 accumulation in roots or shoot. It is, thus, suggested that the plants responded to low NO 3 , availability in medium by enhancing root growth and by maximizing NO 3 reduction relative to NO 3 accumulation.
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Claims 11
Claim · model-written summary
At 0.2 mM nitrate, root and leaf nitrate nearly vanished after ten days.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- 0.2 mM NOe0
- Outcome
- nitrate levels in both roots and leavese0
- Direction
- diminishede0
- Value
- almost zeroe0
- Comparator
- 1.5e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With 0.2 mM NO; nitrate levels in both roots and leaves diminished rapidly and were almost zero after 10 days treatment.”
t0“corn”
e1“at 1.5 and 3.0 mM NO 3”
Claim · model-written summary
Low nitrate restricted shoot growth.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 0.2 mM NOe1
- Outcome
- shoot growthe0
- Direction
- restrictede0
- Comparator
- 1.5e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot growth was restricted, whereas root growth was enhanced”
t0“corn”
e1“With 0.2 mM NO; nitrate levels”
e2“at 1.5 and 3.0 mM NO 3”
Claim · model-written summary
Low nitrate enhanced root growth.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 0.2 mM NOe1
- Outcome
- root growthe0
- Direction
- enhancede0
- Comparator
- 1.5e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot growth was restricted, whereas root growth was enhanced”
t0“corn”
e1“With 0.2 mM NO; nitrate levels”
e2“at 1.5 and 3.0 mM NO 3”
Claim · model-written summary
Leaf reduced nitrogen and malate concentrations declined under low nitrate.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- concentration of reduced nitrogen and malate in the leavese0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of reduced nitrogen and malate in the leaves declined”
t0“corn”
Claim · model-written summary
Leaf nitrate reductase activity, protein and chlorophyll decreased under low nitrate.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- nitrate reductase activity (NRA. EC 1.6.6.1), soluble protein and chlorophyll levelse0
- Direction
- depressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in vitro nitrate reductase activity (NRA. EC 1.6.6.1), soluble protein and chlorophyll levels of leaf tissue were depressed”
t0“corn”
Claim · model-written summary
Leaf starch concentration rose under low nitrate.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- starch concentratione0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“starch concentration was enhanced”
t0“corn”
Claim · model-written summary
At 0.6 mM nitrate, tissue nitrate declined similarly to 0.2 mM.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 0.6 mM NO 3e0
- Outcome
- NO 3 levels in the tissuese0
- Direction
- decreasee0
- Comparator
- 0.2 mM NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With 0.6 mM NO 3 in the nutrient solution, the decrease in NO 3 levels in the tissues and the increase in root development were similar to those observed with 0.2 mM NO 3”
t0“corn”
Claim · model-written summary
At 0.6 mM nitrate, root development increased similarly to 0.2 mM.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 0.6 mM NO 3e0
- Outcome
- root developmente0
- Direction
- increasee0
- Comparator
- 0.2 mM NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With 0.6 mM NO 3 in the nutrient solution, the decrease in NO 3 levels in the tissues and the increase in root development were similar to those observed with 0.2 mM NO 3”
t0“corn”
Claim · model-written summary
At 0.6 mM nitrate, shoot growth and leaf biochemical traits matched higher nitrate treatments.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- shoot growth, reduced nitrogen concentration in leaves, and the above‐mentioned biochemical characteristicse0
- Comparator
- 1.5 and 3.0 mM NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot growth, reduced nitrogen concentration in leaves, and the above‐mentioned biochemical characteristics were almost identical to those obtained at 1.5 and 3.0 mM NO 3”
t0“corn”
Claim · model-written summary
Corn achieved maximal biomass at 0.6 mM nitrate without appreciable nitrate accumulation.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- 0.6 mM NO 3e0
- Outcome
- maximal biomass production without appreciable NO 3 accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when supplied with 0.6 mM NO 3 , corn plants were able to absorb sufficient NO3 to support maximal biomass production without appreciable NO 3 accumulation in roots or shoot”
Claim · model-written summary
Authors suggested enhanced root growth and nitrate reduction as responses to low nitrate.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- maximizing NO 3 reduction relative to NO 3 accumulatione0
- Qualifier
- enhancing root growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants responded to low NO 3 , availability in medium by enhancing root growth and by maximizing NO 3 reduction relative to NO 3 accumulation”
t0“corn”
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See all 13 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.