Abstract
In this study, the Chinese unique Free Air CO2 Enrichment [FACE, 200 μmol·mol-1 higher than ambien(tAMB)] research platform was used to investigate the effects of FACE on root growth dynamics at different growth stages of three-line indica hybrid rice cultivar Shany- ou 63 under two levels of N:low(LN, 125 kg·hm-2)and normal N(NN, 250 kg·hm-2)in 2005—2006. Main results showed that:(1)Compared with AMB, FACE significantly decreased the total absorption area per unit dry weight of root, the active absorption area per unit dry weight of root and the amount of α-NA per unit root dry weight of shanyou 63 at different growth stages. While FACE made larger increment of rice root, which resulted in little effects of FACE on root activity per hole at tillering and jointing stages, but FACE significantly increased root ac- tivity per hole at heading stage(.2)Root activity per unit dry weight of root negatively correlated with the number of adventitious roots per plant, total length of adventitious roots per plant, roots volume and dry weight of root at jointing and heading stages. The larger the root pro- ductions, 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(.4)The larger biomass accumulated, 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 10
Claim · model-written summary
FACE significantly decreased total root absorption area per unit dry weight.
- Taxon
- Indica Rice
Oryza sativa Indica Groupt0 - Material
- Shanyou 63t0
- Treatment
- FACEe0
- Outcome
- total absorption area per unit dry weight of roote0
- Direction
- decreasede0
- Comparator
- AMBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“Compared with AMB, FACE significantly decreased the total absorption area per unit dry weight of root”
Claim · model-written summary
FACE significantly decreased active root absorption area per unit dry weight.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Material
- Shanyou 63t0
- Treatment
- FACEe0
- Outcome
- active absorption area per unit dry weight of roote0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“FACE significantly decreased the total absorption area per unit dry weight of root, the active absorption area per unit dry weight of root”
Claim · model-written summary
FACE significantly decreased α-NA per unit root dry weight.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Material
- Shanyou 63t0
- Treatment
- FACEe0
- Outcome
- amount of α-NA per unit root dry weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“FACE significantly decreased the total absorption area per unit dry weight of root, the active absorption area per unit dry weight of root and the amount of α-NA per unit root dry weight”
Claim · model-written summary
FACE increased rice root growth.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Material
- Shanyou 63t0
- Treatment
- FACEe0
- Outcome
- increment of rice roote0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“FACE made larger increment of rice root”
Claim · model-written summary
FACE had little effect on root activity per hole at tillering and jointing.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Material
- Shanyou 63t0
- Organ / stage
- tillering and jointing stagese0
- Treatment
- FACEe0
- Outcome
- root activity per holee0
- Direction
- little effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“little effects of FACE on root activity per hole at tillering and jointing stages”
Claim · model-written summary
FACE significantly increased root activity per hole at heading.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Material
- Shanyou 63t0
- Organ / stage
- heading stagee0
- Treatment
- FACEe0
- Outcome
- root ac- tivity per holee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“FACE significantly increased root ac- tivity per hole at heading stage”
Claim · model-written summary
Root activity per dry weight was negatively correlated with adventitious root number, length, volume and dry weight.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Organ / stage
- jointing and heading stagese0
- Outcome
- Root activity per unit dry weight of roote0
- Direction
- negatively correlatede0
- Qualifier
- number of adventitious roots per plant, total length of adventitious roots per plant, roots volume and dry weight of roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“Root activity per unit dry weight of root negatively correlated with the number of adventitious roots per plant, total length of adventitious roots per plant, roots volume and dry weight of root at jointing and heading stages”
Claim · model-written summary
Root activity per dry weight was generally positively correlated with plant N content.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- 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
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“root activity per unit dry weight of root positively correlated with N content of rice plant”
Claim · model-written summary
Root activity per dry weight was negatively correlated with C/N ratio.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Material
- Shanyou 63t0
- Outcome
- C/N ratioe0
- Direction
- negatively correlatede0
- Qualifier
- C/N ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“negatively correlated with C/N ratio”
Claim · model-written summary
Biomass accumulation, low N content and high C/N ratio were proposed as causes of reduced root activity under FACE.
- Taxon
- Indica RiceOryza sativa Indica Groupt0
- Treatment
- FACEe0
- Outcome
- root activity per unit dry weight of roote0
- Qualifier
- larger biomass accumulated, lower N content in rice plant and higher C/N ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Indica Rice(Oryza sativa L.)Cultivar Shanyou 63”
e0“The larger biomass accumulated, 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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