Abstract
Rice genotypes includingGangyou 527,Yangdao 6,Zhonghan 3 and Nongken 57 were grown under differentwater stress conditions and treated with ammonium and nitrate at various ratios to investigate the effects of water stress and nitrogen forms on growth,nitrogen absorption and physiological characteristics of rice.The results indicated that,under normal water condition,moderate decrease in the ratio of ammonium/nitrate(50∶50)could increase nitrate content in the leaves and rootsof rice,while the netphotosynthetic rate(Pn)was notaffected.However,when the proportion of nitrate Nwas higher than 50%,the physiological and metabolic indexes decreased significantly and the growth of rice seedlingswas inhibited.Undermoderate water stress condition,the ratio of ammonium/nitrate at50∶50 wasmore beneficial to increasePnof top three leaves,to promote the accumulation of compatible osmolytes,to improve the nitrogen uptake and to boostthe growthof rice seedlings,as comparedwith thattreatedwith normalwaterand 100%ammoniumN,Moreover,undermoderate water stress condition,the responses of different rice genotypes to increasing nitrate N differed from each other significantly.In terms ofPnand nitrogen use efficiency,indica rice was superior to japonica rice;similarly,hybrid indica rice was superior to inbred indica rice,and japonica upland rice was better than japonica paddy rice.No difference was observed in drought tolerance within the same rice genotype.
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Claims 13
Claim · model-written summary
Under normal water, a moderate decrease in the ammonium/nitrate ratio to 50:50 increased nitrate content in rice leaves and roots.
- Taxon
- rice
Oryza sativae1 - Treatment
- moderate decrease in the ratio of ammonium/nitrate(50∶50)e1
- Outcome
- nitrate contente1
- Direction
- increasee1
- Setting
- normal water conditione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“under normal water condition,moderate decrease in the ratio of ammonium/nitrate(50∶50)could increase nitrate content in the leaves and rootsof rice,while the netphotosynthetic rate(Pn)was notaffected”
Claim · model-written summary
Under normal water, the 50:50 ammonium/nitrate ratio did not affect net photosynthetic rate in rice.
- Taxon
- riceOryza sativae1
- Treatment
- ammonium/nitrate(50∶50)e1
- Outcome
- netphotosynthetic rate(Pn)e1
- Direction
- notaffectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“under normal water condition,moderate decrease in the ratio of ammonium/nitrate(50∶50)could increase nitrate content in the leaves and rootsof rice,while the netphotosynthetic rate(Pn)was notaffected”
Claim · model-written summary
When nitrate N exceeded 50% of the N supply, physiological and metabolic indexes in rice decreased significantly.
- Taxon
- riceOryza sativae1
- Treatment
- proportion of nitrate Ne1
- Outcome
- physiological and metabolic indexese1
- Direction
- decreased significantlye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“However, when the proportion of nitrate Nwas higher than 50%,the physiological and metabolic indexes decreased significantly and the growth of rice seedlingswas inhibited”
Claim · model-written summary
When nitrate N exceeded 50% of the N supply, growth of rice seedlings was inhibited.
- Taxon
- riceOryza sativae1
- Treatment
- proportion of nitrate Ne1
- Outcome
- growth of rice seedlingse1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“However, when the proportion of nitrate Nwas higher than 50%,the physiological and metabolic indexes decreased significantly and the growth of rice seedlingswas inhibited”
Claim · model-written summary
Under moderate water stress, the 50:50 ratio increased net photosynthetic rate of the top three rice leaves compared with normal water and 100% ammonium N.
- Taxon
- riceOryza sativae3
- Treatment
- ratio of ammonium/nitrate at50∶50e1
- Outcome
- Pnof top three leavese1
- Direction
- increasee1
- Comparator
- normalwaterand 100%ammoniumNe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the ratio of ammonium/nitrate at50∶50 wasmore beneficial to increasePnof top three leaves”
e2“as comparedwith thattreatedwith normalwaterand 100%ammoniumN”
e3“under normal water condition,moderate decrease in the ratio of ammonium/nitrate(50∶50)could increase nitrate content in the leaves and rootsof rice,while the netphotosynthetic rate(Pn)was notaffected”
Claim · model-written summary
Under moderate water stress, the 50:50 ratio promoted accumulation of compatible osmolytes in rice compared with normal water and 100% ammonium N.
- Taxon
- riceOryza sativae4
- Treatment
- ratio of ammonium/nitrate at50∶50e1
- Outcome
- accumulation of compatible osmolytese3
- Direction
- promotee3
- Comparator
- normalwaterand 100%ammoniumNe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the ratio of ammonium/nitrate at50∶50 wasmore beneficial to increasePnof top three leaves”
e2“as comparedwith thattreatedwith normalwaterand 100%ammoniumN”
e3“to promote the accumulation of compatible osmolytes”
e4“under normal water condition,moderate decrease in the ratio of ammonium/nitrate(50∶50)could increase nitrate content in the leaves and rootsof rice,while the netphotosynthetic rate(Pn)was notaffected”
Claim · model-written summary
Under moderate water stress, the 50:50 ratio improved nitrogen uptake in rice compared with normal water and 100% ammonium N.
- Taxon
- riceOryza sativae4
- Treatment
- ratio of ammonium/nitrate at50∶50e1
- Outcome
- nitrogen uptakee3
- Direction
- improvee3
- Comparator
- normalwaterand 100%ammoniumNe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the ratio of ammonium/nitrate at50∶50 wasmore beneficial to increasePnof top three leaves”
e2“as comparedwith thattreatedwith normalwaterand 100%ammoniumN”
e3“to improve the nitrogen uptake”
e4“under normal water condition,moderate decrease in the ratio of ammonium/nitrate(50∶50)could increase nitrate content in the leaves and rootsof rice,while the netphotosynthetic rate(Pn)was notaffected”
Claim · model-written summary
Under moderate water stress, the 50:50 ratio boosted growth of rice seedlings compared with normal water and 100% ammonium N.
- Taxon
- riceOryza sativae3
- Treatment
- ratio of ammonium/nitrate at50∶50e1
- Outcome
- growth of rice seedlingse3
- Direction
- booste3
- Comparator
- normalwaterand 100%ammoniumNe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the ratio of ammonium/nitrate at50∶50 wasmore beneficial to increasePnof top three leaves”
e2“as comparedwith thattreatedwith normalwaterand 100%ammoniumN”
e3“to boostthe growthof rice seedlings”
Claim · model-written summary
Under moderate water stress, rice genotypes differed significantly in their responses to increasing nitrate N.
- Taxon
- riceOryza sativae2
- Material
- rice genotypese1
- Treatment
- increasing nitrate Ne1
- Outcome
- responses of different rice genotypes to increasing nitrate Ne1
- Direction
- differede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the responses of different rice genotypes to increasing nitrate N differed from each other significantly”
e2“under normal water condition,moderate decrease in the ratio of ammonium/nitrate(50∶50)could increase nitrate content in the leaves and rootsof rice,while the netphotosynthetic rate(Pn)was notaffected”
Claim · model-written summary
Indica rice was superior to japonica rice in net photosynthetic rate and nitrogen use efficiency.
- Taxon
- riceOryza sativae1
- Material
- indica ricee1
- Outcome
- Pnand nitrogen use efficiencye1
- Direction
- superiore1
- Comparator
- japonica ricee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In terms ofPnand nitrogen use efficiency,indica rice was superior to japonica rice”
Claim · model-written summary
Hybrid indica rice was superior to inbred indica rice in net photosynthetic rate and nitrogen use efficiency.
- Taxon
- riceOryza sativae1
- Material
- hybrid indica ricee1
- Outcome
- Pnand nitrogen use efficiencye2
- Direction
- superiore1
- Comparator
- inbred indica ricee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“similarly,hybrid indica rice was superior to inbred indica rice”
e2“In terms ofPnand nitrogen use efficiency,indica rice was superior to japonica rice”
Claim · model-written summary
Japonica upland rice was better than japonica paddy rice in net photosynthetic rate and nitrogen use efficiency.
- Taxon
- riceOryza sativae1
- Material
- japonica upland ricee1
- Outcome
- Pnand nitrogen use efficiencye2
- Direction
- bettere1
- Comparator
- japonica paddy ricee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“japonica upland rice was better than japonica paddy rice”
e2“In terms ofPnand nitrogen use efficiency,indica rice was superior to japonica rice”
Claim · model-written summary
No difference in drought tolerance was observed within the same rice genotype.
- Taxon
- riceOryza sativae1
- Material
- rice genotypee1
- Outcome
- drought tolerancee1
- Direction
- No differencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“No difference was observed in drought tolerance within the same rice genotype”
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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.