Abstract
Under FACE(free-air carbon dioxide enrichment)condition,root growth was monitored of rice(C_3 crop)and barnyardgrass(C_4 weed)in hydroponics with two levels of nitrogen supply.Results show that root biomass,root volume,root length and root diameter of rice and barnyardgrass all increased significantly under FACE condition with NN(normal nitrogen)supply,the response of rice to CO_2 was higher than that of barnyardgrass.FACE condition with LN(low nitrogen)supply did not significantly promote rice growth because of N stress,but response of barnyardgrass to CO_2 was not limited by N stress,showing significant increase in growth.N concentration of the root decreased significantly in elevated CO_2 but C concentration did not change remarkably,which led to obvious increase in ratio of C/N.Elevated CO_2 also decreased remarkably the number of root hair and per-unit dry root weight of rice and barnyardgrass,which might be one of morphological reasons why root activity decreased under FACE condition.
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Claims 17
Claim · model-written summary
Under normal nitrogen, FACE significantly increased rice root biomass, volume and length.
- Taxon
- rice
Oryza sativae0 - Treatment
- FACE condition with NN(normal nitrogen)supplye0
- Outcome
- root biomass,root volume,root lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root biomass,root volume,root length and root diameter of rice and barnyardgrass all increased significantly under FACE condition with NN(normal nitrogen)supply”
Claim · model-written summary
Under normal nitrogen, FACE significantly increased rice root diameter.
- Taxon
- riceOryza sativae0
- Treatment
- FACE condition with NN(normal nitrogen)supplye0
- Outcome
- root diametere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root biomass,root volume,root length and root diameter of rice and barnyardgrass all increased significantly under FACE condition with NN(normal nitrogen)supply”
Claim · model-written summary
Under normal nitrogen, FACE significantly increased barnyardgrass root biomass, volume and length.
- Taxon
- barnyardgrass
Echinochloa crus-gallie0 - Treatment
- FACE condition with NN(normal nitrogen)supplye0
- Outcome
- root biomass,root volume,root lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root biomass,root volume,root length and root diameter of rice and barnyardgrass all increased significantly under FACE condition with NN(normal nitrogen)supply”
Claim · model-written summary
Under normal nitrogen, FACE significantly increased barnyardgrass root diameter.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Treatment
- FACE condition with NN(normal nitrogen)supplye0
- Outcome
- root diametere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root biomass,root volume,root length and root diameter of rice and barnyardgrass all increased significantly under FACE condition with NN(normal nitrogen)supply”
Claim · model-written summary
Rice had a stronger carbon dioxide root response than barnyardgrass under normal nitrogen.
- Taxon
- riceOryza sativae0
- Interactor
- barnyardgrassEchinochloa crus-gallie0weed
- Outcome
- response of rice to CO_2e0
- Direction
- highere0
- Comparator
- barnyardgrasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the response of rice to CO_2 was higher than that of barnyardgrass”
Claim · model-written summary
At low nitrogen, FACE did not significantly promote rice growth because of nitrogen stress.
- Taxon
- riceOryza sativae0
- Treatment
- FACE condition with LN(low nitrogen)supplye0
- Outcome
- rice growthe0
- Direction
- did not significantly promotee0
- Qualifier
- because of N stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FACE condition with LN(low nitrogen)supply did not significantly promote rice growth because of N stress”
Claim · model-written summary
At low nitrogen, barnyardgrass growth increased significantly under FACE.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Treatment
- FACE condition with LN(low nitrogen)supplye1
- Outcome
- growthe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of barnyardgrass to CO_2 was not limited by N stress,showing significant increase in growth”
e1“FACE condition with LN(low nitrogen)supply”
Claim · model-written summary
Elevated carbon dioxide significantly reduced root nitrogen concentration in rice.
- Taxon
- riceOryza sativae1
- Treatment
- elevated CO_2e0
- Outcome
- N concentration of the roote0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N concentration of the root decreased significantly in elevated CO_2”
e1“root growth was monitored of rice(C_3 crop)and barnyardgrass(C_4 weed)”
Claim · model-written summary
Elevated carbon dioxide significantly reduced root nitrogen concentration in barnyardgrass.
- Taxon
- barnyardgrassEchinochloa crus-gallie1
- Treatment
- elevated CO_2e0
- Outcome
- N concentration of the roote0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N concentration of the root decreased significantly in elevated CO_2”
e1“root growth was monitored of rice(C_3 crop)and barnyardgrass(C_4 weed)”
Claim · model-written summary
Root carbon concentration did not change markedly under elevated carbon dioxide.
- Taxon
- riceOryza sativae2
- Treatment
- elevated CO_2e1
- Outcome
- C concentratione0
- Direction
- did not change remarkablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“C concentration did not change remarkably”
e1“elevated CO_2”
e2“root growth was monitored of rice(C_3 crop)and barnyardgrass(C_4 weed)”
Claim · model-written summary
Root carbon concentration did not change markedly under elevated carbon dioxide in barnyardgrass.
- Taxon
- barnyardgrassEchinochloa crus-gallie2
- Treatment
- elevated CO_2e1
- Outcome
- C concentratione0
- Direction
- did not change remarkablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“C concentration did not change remarkably”
e1“elevated CO_2”
e2“root growth was monitored of rice(C_3 crop)and barnyardgrass(C_4 weed)”
Claim · model-written summary
Elevated carbon dioxide increased root carbon-to-nitrogen ratio in rice.
- Taxon
- riceOryza sativae2
- Treatment
- elevated CO_2e1
- Outcome
- ratio of C/Ne0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which led to obvious increase in ratio of C/N”
e1“elevated CO_2”
e2“root growth was monitored of rice(C_3 crop)and barnyardgrass(C_4 weed)”
Claim · model-written summary
Elevated carbon dioxide increased root carbon-to-nitrogen ratio in barnyardgrass.
- Taxon
- barnyardgrassEchinochloa crus-gallie2
- Treatment
- elevated CO_2e1
- Outcome
- ratio of C/Ne0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which led to obvious increase in ratio of C/N”
e1“elevated CO_2”
e2“root growth was monitored of rice(C_3 crop)and barnyardgrass(C_4 weed)”
Claim · model-written summary
Elevated carbon dioxide markedly decreased rice root hair number and per-unit dry root weight.
- Taxon
- riceOryza sativae0
- Treatment
- Elevated CO_2e0
- Outcome
- number of root hair and per-unit dry root weighte0
- Direction
- decreased remarkablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO_2 also decreased remarkably the number of root hair and per-unit dry root weight of rice and barnyardgrass”
Claim · model-written summary
Elevated carbon dioxide markedly decreased barnyardgrass root hair number and per-unit dry root weight.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Treatment
- Elevated CO_2e0
- Outcome
- number of root hair and per-unit dry root weighte0
- Direction
- decreased remarkablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO_2 also decreased remarkably the number of root hair and per-unit dry root weight of rice and barnyardgrass”
Claim · model-written summary
The authors suggest reduced root hairs and per-unit dry root weight may explain lower root activity under FACE.
- Taxon
- riceOryza sativae0
- Organ / stage
- root haire0
- Outcome
- root activity decreasede0
- Qualifier
- might be one of morphological reasonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased remarkably the number of root hair and per-unit dry root weight of rice and barnyardgrass,which might be one of morphological reasons why root activity decreased under FACE condition”
Claim · model-written summary
The authors suggest reduced root hairs and per-unit dry root weight may explain lower barnyardgrass root activity under FACE.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Organ / stage
- root haire0
- Outcome
- root activity decreasede0
- Qualifier
- might be one of morphological reasonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased remarkably the number of root hair and per-unit dry root weight of rice and barnyardgrass,which might be one of morphological reasons why root activity decreased under FACE condition”
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