Abstract
A free-air CO_2 enrichment experiment was conducted at Anzhen city,Wuxi,Jiangsu,China,to study the effect of free-air CO_2 enrichment [FACE,200 μmol·mol~(-1) higher than Ambient(AMB)] on root growth dynamics,using the japonica cultivar Wuxiangjing 14.Results showed that:(1) The peak value of total absorption area per unit dry weight of root and active absorption area per unit dry weight of root under FACE reached 10 days earlier than those at ambient air;and FACE treatment significantly decreased the total absorption area per unit dry weight of root,active absorption area per unit dry weight of root and the amount of α-NA per unit dry weight of root at 18 days after transplanting and its followed different stages,while little effects of FACE were detected on root activity per hole.(2)Root activity per unit dry weight of root negatively correlated with the number of adventitious roots per hole,total length of adventitious roots per hole,roots volume and dry weight of root per hole at 28 days after transplanting and its followed different stages.The larger the root production,the lower the root activity per unit dry weight.(3) For the most part,root activity per unit dry weight of root positively correlated with N content of rice plant,and negatively correlated with C/N ratio.According to available study results,the authors speculated that the largeness of biomass accumulated at early growth stages,lower N content in rice plant and higher C/N ratio appear to be the primary causes of significant decrement of root activity per unit dry weight of root under FACE condition.
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Claims 6
Claim · model-written summary
FACE advanced the peaks of two root absorption-area measures by 10 days.
- Taxon
- Japonica Rice
_by_Augustus_Binu.jpg?width=60)
Oryza sativa Japonica Groupt0 - Treatment
- FACEe0
- Outcome
- total absorption area per unit dry weight of root and active absorption area per unit dry weight of roote0
- Direction
- earliere0
- Value
- 10 dayse0
- Comparator
- ambient aire0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_by_Augustus_Binu.jpg?width=500)
Verbatim
e0“The peak value of total absorption area per unit dry weight of root and active absorption area per unit dry weight of root under FACE reached 10 days earlier than those at ambient air”
t0“Japonica Rice”
Claim · model-written summary
FACE significantly decreased root absorption areas and α-NA per root dry weight from day 18 onward.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Treatment
- FACE treatmente0
- Outcome
- total absorption area per unit dry weight of root,active absorption area per unit dry weight of root and the amount of α-NA per unit dry weight of roote0
- Direction
- decreasede0
- Qualifier
- 18 days after transplanting and its followed different stagese0
- Comparator
- Ambient(AMB)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FACE treatment significantly decreased the total absorption area per unit dry weight of root,active absorption area per unit dry weight of root and the amount of α-NA per unit dry weight of root at 18 days after transplanting and its followed different stages”
e1“higher than Ambient(AMB)”
t0“Japonica Rice”
Claim · model-written summary
FACE had little effect on root activity per hole.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Treatment
- FACEe0
- Outcome
- root activity per holee0
- Direction
- little effectse0
- Comparator
- Ambient(AMB)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“little effects of FACE were detected on root activity per hole”
e1“higher than Ambient(AMB)”
t0“Japonica Rice”
Claim · model-written summary
Root activity per unit dry weight was negatively correlated with adventitious-root number and length, root volume, and root dry weight.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Organ / stage
- roote0
- Outcome
- Root activity per unit dry weight of roote0
- Direction
- negatively correlatede0
- Qualifier
- at 28 days after transplanting and its followed different stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activity per unit dry weight of root negatively correlated with the number of adventitious roots per hole,total length of adventitious roots per hole,roots volume and dry weight of root per hole at 28 days after transplanting and its followed different stages”
t0“Japonica Rice”
Claim · model-written summary
Root activity per unit dry weight correlated positively with plant nitrogen content.
- Taxon
- rice plant
Oryza sativae0 - Compound
- Ne0
- Outcome
- root activity per unit dry weight of roote0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root activity per unit dry weight of root positively correlated with N content of rice plant”
Claim · model-written summary
Root activity per unit dry weight correlated negatively with C/N ratio.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Compound
- C/Ne0
- Outcome
- root activity per unit dry weight of roote0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root activity per unit dry weight of root positively correlated with N content of rice plant,and negatively correlated with C/N ratio”
t0“Japonica Rice”
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co2 · growth · Oryza sativa (rice)Positive and negative results
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See all 124 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.