Abstract
Nitrogen is one of the most important nutrients limiting the production of cereal crops.There has been increased evidence that nitrate(NO~-_3) had an enhanced effect on rice production although it prefers ammonium(NH~+_4) nutrition.Furthermore,rice is being increasingly cultivated in the soil intermittently irrigated or even in aerobic soil condition in China.Thus,nitrate plays a more remarkable role than ever before.Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes,i.e.OsNia1,OsNia2 in two cultivars(Nanguang and Yunjing) at the seedling stage(35-day-old) under control conditions.The results obtained were as follows.Both rice cultivars growing in mixed N supply achieved a maximum biomass.NO~-_3 supply could increase the biomass of rice shoots and roots on average by about 23% and 18%,respectively.Total N accumulation in Nanguang and Yunjing applying mixed N sources(NH~+_4 and NO~-_3) was 18% and 8% higher than those single applying NH~+_4.RT-PCR analysis of different samples revealed that transcript levels of OsNia1,OsNia2 increased in response to mixed N supply.The transcript level of OsNia2 was significantly higher than OsNia1 in both rice cultivars tested.Nanguang responses to NO~-_3 in a greater way that the transcript levels of OsNia2 both in leaves and roots and OsNia1 transcripts in leaves were higher than Yunjing.NR activities of both in leaves and roots of Nanguang were more significantly promoted than Yunjing fed with NH_4NO_3.The high activity of NR [NO_2 67 μmol/(g·h)] showed that rice was also efficient in absorbing and assimilating NO~-_3.The more efficient inorganic N assimilation resulted in an improved growth of rice.In conclusion,rice,like many plants,supplied with mixed N have a beneficial effect on crop growth NO~-_3.Therefore,promoting nitrification to a certain extent in paddy soil is of great significance for rice production.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 15
Claim · model-written summary
Both rice cultivars grown with mixed N supply achieved a maximum biomass.
- Taxon
- rice
Oryza sativae2 - Material
- Both rice cultivarse2
- Treatment
- mixed N supplye2
- Outcome
- biomasse2
- Direction
- maximume2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Both rice cultivars growing in mixed N supply achieved a maximum biomass”
Claim · model-written summary
NO3- supply increased the biomass of rice shoots by about 23%.
- Taxon
- riceOryza sativae3
- Organ / stage
- shootse3
- Treatment
- NO~-_3 supplye3
- Outcome
- biomasse3
- Direction
- increasee3
- Value
- 23%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e3“NO~-_3 supply could increase the biomass of rice shoots and roots on average by about 23% and 18%”
Claim · model-written summary
NO3- supply increased the biomass of rice roots by about 18%.
- Taxon
- riceOryza sativae3
- Organ / stage
- rootse3
- Treatment
- NO~-_3 supplye3
- Outcome
- biomasse3
- Direction
- increasee3
- Value
- 18%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e3“NO~-_3 supply could increase the biomass of rice shoots and roots on average by about 23% and 18%”
Claim · model-written summary
Total N accumulation in Nanguang with mixed N sources was 18% higher than with single NH4+ supply.
- Taxon
- riceOryza sativae1
- Material
- Nanguange4
- Treatment
- mixed N sourcese4
- Outcome
- Total N accumulatione4
- Direction
- highere4
- Value
- 18%e4
- Comparator
- single applying NH~+_4e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e4“Total N accumulation in Nanguang and Yunjing applying mixed N sources(NH~+_4 and NO~-_3) was 18% and 8% higher than those single applying NH~+_4”
Claim · model-written summary
Total N accumulation in Yunjing with mixed N sources was 8% higher than with single NH4+ supply.
- Taxon
- riceOryza sativae1
- Material
- Yunjinge4
- Treatment
- mixed N sourcese4
- Outcome
- Total N accumulatione4
- Direction
- highere4
- Value
- 8%e4
- Comparator
- single applying NH~+_4e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e4“Total N accumulation in Nanguang and Yunjing applying mixed N sources(NH~+_4 and NO~-_3) was 18% and 8% higher than those single applying NH~+_4”
Claim · model-written summary
Transcript levels of OsNia1 and OsNia2 increased in response to mixed N supply.
- Taxon
- riceOryza sativae1
- Treatment
- mixed N supplye5
- Gene
- OsNia1,OsNia2e5
- Outcome
- transcript levelse5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e5“RT-PCR analysis of different samples revealed that transcript levels of OsNia1,OsNia2 increased in response to mixed N supply”
Claim · model-written summary
OsNia2 transcript level was significantly higher than OsNia1 in both rice cultivars.
- Taxon
- riceOryza sativae6
- Material
- both rice cultivarse6
- Gene
- OsNia2e6
- Outcome
- transcript levele6
- Direction
- highere6
- Comparator
- OsNia1e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The transcript level of OsNia2 was significantly higher than OsNia1 in both rice cultivars tested”
Claim · model-written summary
In Nanguang, OsNia2 transcript levels in leaves and roots were higher than in Yunjing under NO3- supply.
- Taxon
- riceOryza sativae1
- Material
- Nanguange7
- Organ / stage
- leaves and rootse7
- Gene
- OsNia2e7
- Outcome
- transcript levelse7
- Direction
- highere7
- Comparator
- Yunjinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e7“Nanguang responses to NO~-_3 in a greater way that the transcript levels of OsNia2 both in leaves and roots and OsNia1 transcripts in leaves were higher than Yunjing”
Claim · model-written summary
In Nanguang, OsNia1 transcripts in leaves were higher than in Yunjing under NO3- supply.
- Taxon
- riceOryza sativae1
- Material
- Nanguange7
- Organ / stage
- leavese7
- Gene
- OsNia1e7
- Outcome
- transcriptse7
- Direction
- highere7
- Comparator
- Yunjinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e7“Nanguang responses to NO~-_3 in a greater way that the transcript levels of OsNia2 both in leaves and roots and OsNia1 transcripts in leaves were higher than Yunjing”
Claim · model-written summary
NR activities in leaves and roots of Nanguang were more significantly promoted than in Yunjing fed with NH4NO3.
- Taxon
- riceOryza sativae1
- Material
- Nanguange2
- Organ / stage
- leaves and rootse2
- Treatment
- NH_4NO_3e2
- Outcome
- NR activitiese2
- Direction
- promotede2
- Comparator
- Yunjinge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Hydroponic experiments were carried out to study the effects of partial replacement of NH~+_4 by NO~-_3 on the growth,nitrogen(N) accumulation,nitrate concentration,nitrate reductase(NR) activity and expression patterns of two rice(Oryza sativa L.) NR genes”
e2“NR activities of both in leaves and roots of Nanguang were more significantly promoted than Yunjing fed with NH_4NO_3”
Claim · model-written summary
High NR activity of 67 μmol/(g·h) was measured in rice supplied with NO3-.
- Taxon
- riceOryza sativae2
- Outcome
- activity of NRe2
- Value
- 67 μmol/(g·h)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The high activity of NR [NO_2 67 μmol/(g·h)] showed that rice was also efficient in absorbing and assimilating NO~-_3”
Claim · model-written summary
Rice was efficient in absorbing and assimilating NO3-.
- Taxon
- riceOryza sativae2
- Outcome
- efficient in absorbing and assimilating NO~-_3e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The high activity of NR [NO_2 67 μmol/(g·h)] showed that rice was also efficient in absorbing and assimilating NO~-_3”
Claim · model-written summary
More efficient inorganic N assimilation resulted in improved growth of rice.
- Taxon
- riceOryza sativae2
- Outcome
- improved growthe2
- Qualifier
- more efficient inorganic N assimilatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The more efficient inorganic N assimilation resulted in an improved growth of rice”
Claim · model-written summary
Rice supplied with mixed N has a beneficial effect on crop growth.
- Taxon
- riceOryza sativae2
- Treatment
- supplied with mixed Ne2
- Outcome
- crop growthe2
- Direction
- beneficial effecte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“In conclusion,rice,like many plants,supplied with mixed N have a beneficial effect on crop growth NO~-_3”
Claim · model-written summary
Promoting nitrification to a certain extent in paddy soil is of great significance for rice production.
- Taxon
- riceOryza sativae2
- Outcome
- promoting nitrification to a certain extent in paddy soile2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Therefore,promoting nitrification to a certain extent in paddy soil is of great significance for rice production”
The same questions in other papers
nitric oxide · growth · Oryza sativa (rice)Results differ
13 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
12 papers more in this group
See all 16 papers →nitrogen · growth · Oryza sativa (rice)Positive and negative results
401 papers in the same direction as this paper · 101 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- negative
507 papers more in this group
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.