Abstract
This study was conducted to examine whether the root system development in rice plant under different nitrogen (N) application regimes is related to adaptability for heavy manuring (AHM) of the cultivar. Four rice cultivars that differ in AHM were grown in plastic pots (25 cm in diameter, 30 cm in depth), under three N levels, which were equivalent to 5 kg-N/1000 m2 (5 N plot), 10 kg-N/1000m2 (10 N plot) and 30 kg-N/1000 m2 (30 N plot). The plants were harvested 33 days after sowing and at heading stage. In the 33-day-old plants, growth of root system was inhibited with increasing N application, apart from the production of the nodal roots, which was promoted. Although the root responses differed with the cultivars, the differences were not related to those of AHM. On the other hand, in the heading-stage plants, the total number and length of nodal root axes per plant increased. But again, notable differences among the cultivars were not recognized. In contrast, different responses to N application according to AHM of the cultivars was found in lateral root development. The cultivars with AHM showed a substantial increase in total lateral root length per plant at 30 N plot as compared with those in 5 N and 10 N plots, whereas the lateral root growth of the cultivars with high AHM remained relatively unchanged under the different N levels.
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Claims 9
Claim · model-written summary
In 33-day-old rice, increasing nitrogen inhibited root system growth.
- Taxon
- Rice Plant
Oryza sativat0 - Organ / stage
- 33-day-old plantse0
- Treatment
- increasing N applicatione0
- Outcome
- growth of root systeme0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the 33-day-old plants, growth of root system was inhibited with increasing N application”
t0“Rice Plant”
Claim · model-written summary
Increasing nitrogen promoted nodal root production in 33-day-old rice.
- Taxon
- Rice PlantOryza sativat0
- Organ / stage
- 33-day-old plantse0
- Treatment
- increasing N applicatione0
- Outcome
- production of the nodal rootse0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the 33-day-old plants, growth of root system was inhibited with increasing N application, apart from the production of the nodal roots, which was promoted”
t0“Rice Plant”
Claim · model-written summary
Root responses in 33-day-old plants differed among cultivars but were unrelated to adaptability for heavy manuring.
- Taxon
- Rice PlantOryza sativat0
- Material
- cultivarse0
- Outcome
- root responsese0
- Direction
- not relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the root responses differed with the cultivars, the differences were not related to those of AHM”
t0“Rice Plant”
Claim · model-written summary
At heading, the total number of nodal root axes per plant increased.
- Taxon
- Rice PlantOryza sativat0
- Organ / stage
- heading-stage plantse0
- Outcome
- total numbere0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the heading-stage plants, the total number and length of nodal root axes per plant increased”
t0“Rice Plant”
Claim · model-written summary
At heading, the total length of nodal root axes per plant increased.
- Taxon
- Rice PlantOryza sativat0
- Organ / stage
- heading-stage plantse0
- Outcome
- length of nodal root axes per plante0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the heading-stage plants, the total number and length of nodal root axes per plant increased”
t0“Rice Plant”
Claim · model-written summary
Notable cultivar differences in heading-stage nodal root axes were not recognized.
- Taxon
- Rice PlantOryza sativat0
- Material
- cultivarse0
- Outcome
- notable differences among the cultivars were not recognizede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“But again, notable differences among the cultivars were not recognized”
t0“Rice Plant”
Claim · model-written summary
Lateral root development responded differently to nitrogen according to cultivar adaptability for heavy manuring.
- Taxon
- Rice PlantOryza sativat0
- Material
- cultivarse0
- Treatment
- N applicatione0
- Outcome
- lateral root developmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different responses to N application according to AHM of the cultivars was found in lateral root development”
t0“Rice Plant”
Claim · model-written summary
Cultivars with AHM had substantially longer total lateral roots at 30 N than at 5 N and 10 N.
- Taxon
- Rice PlantOryza sativat0
- Material
- cultivars with AHMe0
- Treatment
- 30 N plote0
- Outcome
- total lateral root length per plante0
- Direction
- increasee0
- Comparator
- 5 N and 10 N plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cultivars with AHM showed a substantial increase in total lateral root length per plant at 30 N plot as compared with those in 5 N and 10 N plots”
t0“Rice Plant”
Claim · model-written summary
Lateral root growth of high-AHM cultivars remained relatively unchanged across nitrogen levels.
- Taxon
- Rice PlantOryza sativat0
- Material
- cultivars with high AHMe0
- Treatment
- different N levelse0
- Outcome
- lateral root growthe0
- Direction
- remained relatively unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lateral root growth of the cultivars with high AHM remained relatively unchanged under the different N levels”
t0“Rice Plant”
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