Abstract
The aim of this study was to examine the effect of various NH4-nitrogen concentrations in culture solution on the seminal root elongation of the rice plant. Ten rice cultivars with differing adaptabilities for heavy manuring were grown in Kasugai rice culture solution at 30°C for 12 days. First, the nitrogen concentration was set at four levels, 0, 4, 40 and 240 mg L-1. In all the cultivars, seminal root elongation was exponentially inhibited with increasing nitrogen concentration and thus the inhibitory effect per unit increase of nitrogen concentration was much greater in the range of 0 to 4 mg L-1 than in the higher range. In a separate experiment, nitrogen concentration was set at six levels, 0, 0.4, 1, 2, 3 and 4 mg L-1. In this range, seminal root elongation was linearly inhibited with increasing nitrogen concentration. Comparing the cultivars, a clear trend was seen. The seminal root elongation of the rice cultivars, which are reputed for their low adaptability for heavy manuring, was more severely inhibited as nitrogen concentration increased compared to cultivars with high adaptability. Additionally, the seminal root axis length of the former cultivars tended to be greater than that of the latter cultivars when nitrogen concentration was at 0 mg L-1.
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Claims 4
Claim · model-written summary
Increasing nitrogen exponentially inhibited seminal root elongation across cultivars.
- Taxon
- rice
Oryza sativae1 - Treatment
- increasing nitrogen concentratione0
- Outcome
- seminal root elongatione0
- Direction
- inhibitede0
- Qualifier
- in the range of 0 to 4 mg L-1e0
- Comparator
- higher rangee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all the cultivars, seminal root elongation was exponentially inhibited with increasing nitrogen concentration and thus the inhibitory effect per unit increase of nitrogen concentration was much greater in the range of 0 to 4 mg L-1 than in the higher range”
e1“rice plant”
Claim · model-written summary
Nitrogen linearly inhibited root elongation in the low concentration experiment.
- Taxon
- riceOryza sativae1
- Treatment
- increasing nitrogen concentratione0
- Outcome
- seminal root elongatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In this range, seminal root elongation was linearly inhibited with increasing nitrogen concentration”
e1“rice plant”
Claim · model-written summary
Low adaptability cultivars showed stronger nitrogen-associated root inhibition.
- Taxon
- riceOryza sativae1
- Material
- rice cultivars, which are reputed for their low adaptability for heavy manuringe0
- Treatment
- nitrogen concentration increasede0
- Outcome
- seminal root elongatione0
- Direction
- more severely inhibitede0
- Comparator
- cultivars with high adaptabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The seminal root elongation of the rice cultivars, which are reputed for their low adaptability for heavy manuring, was more severely inhibited as nitrogen concentration increased compared to cultivars with high adaptability”
e1“rice plant”
Claim · model-written summary
Low adaptability cultivars tended to have longer seminal root axes at zero nitrogen.
- Taxon
- riceOryza sativae1
- Outcome
- seminal root axis lengthe0
- Direction
- greatere0
- Qualifier
- when nitrogen concentration was at 0 mg L-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the seminal root axis length of the former cultivars tended to be greater than that of the latter cultivars when nitrogen concentration was at 0 mg L-1”
e1“rice plant”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
108 papers in the same direction as this paper · 402 in the opposite direction
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See all 511 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.