Abstract
Abstract Nitrogen (N) nutrition is the major factor involved in attaining high yield in rice (Oryza sativa L.). This study was conducted to elucidate the relationship between the ammonium-N concentration of the culture solution and the root system development of F1 rice hybrid and parents. The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d. Two and 20 mg L-1 N of culture solutions suppressed the elongation of both nodal root axes and lateral roots, whereas 20 mg L-1 N promoted the proliferation of the lateral roots. As a result, total root length was greatest in the 0.2 mg L-1 N-fed plants. On the contrary, the dry matter partitioned to the root systems of the 0.2 mg L-1 N-fed plants was the same as or smaller than that of the 2 and 20 mg L-1 N-fed plants. The ratio of total length to dry weight of the root system (specific root length) showed a trend similar to the total root length. The trend of root system development was similar in both F1 hybrid and parents. Moreover, we observed that for the F1 hybrid, the total root length and the specific root length of the 20 mg L-1 N-fed plants were almost the same as those of the 0.2 mg L-1 N-fed plants. These results suggest that the root system of the F1 rice hybrid and parents grown in 0.2 mg L-1 N and that of the F1 rice hybrid grown in 20 mg L-1 N are highly efficient in converting the dry matter into root length increment.
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Claims 8
Claim · model-written summary
Two and 20 mg L-1 N suppressed the elongation of nodal root axes and lateral roots.
- Taxon
- rice
Oryza sativae0e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“Two and 20 mg L-1 N of culture solutions suppressed the elongation of both nodal root axes and lateral roots”
Claim · model-written summary
20 mg L-1 N promoted the proliferation of lateral roots.
- Taxon
- riceOryza sativae0e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“whereas 20 mg L-1 N promoted the proliferation of the lateral roots”
Claim · model-written summary
Total root length was greatest in plants grown at 0.2 mg L-1 N.
- Taxon
- riceOryza sativae0e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“total root length was greatest in the 0.2 mg L-1 N-fed plants”
Claim · model-written summary
Dry matter partitioned to the root systems at 0.2 mg L-1 N was the same as or smaller than at 2 and 20 mg L-1 N.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“the dry matter partitioned to the root systems of the 0.2 mg L-1 N-fed plants was the same as or smaller than that of the 2 and 20 mg L-1 N-fed plants”
Claim · model-written summary
Specific root length showed a trend similar to total root length across N levels.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“The ratio of total length to dry weight of the root system (specific root length) showed a trend similar to the total root length”
Claim · model-written summary
The trend of root system development was similar in the F1 hybrid and its parents.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“The trend of root system development was similar in both F1 hybrid and parents”
Claim · model-written summary
For the F1 hybrid, total root length and specific root length at 20 mg L-1 N were almost the same as at 0.2 mg L-1 N.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“for the F1 hybrid, the total root length and the specific root length of the 20 mg L-1 N-fed plants were almost the same as those of the 0.2 mg L-1 N-fed plants”
Claim · model-written summary
The root systems of the F1 rice hybrid and parents at 0.2 mg L-1 N, and of the F1 hybrid at 20 mg L-1 N, are highly efficient in converting dry matter into root length increment.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d”
e1“the root system of the F1 rice hybrid and parents grown in 0.2 mg L-1 N and that of the F1 rice hybrid grown in 20 mg L-1 N are highly efficient in converting the dry matter into root length increment”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
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