Re-sorption of organic compounds by roots of Zea mays L. and its consequences in the rhizosphere: III. Characteristics of sugar influx and efflux
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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Yn: Plant and Soil, Cyfrol 178, Rhif 1, 01.1996, t. 153-160.
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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T1 - Re-sorption of organic compounds by roots of Zea mays L. and its consequences in the rhizosphere
T2 - III. Characteristics of sugar influx and efflux
AU - Jones, Davey L.
AU - Darrah, P.R.
PY - 1996/1
Y1 - 1996/1
N2 - The influx and efflux of sugar-C and the cycling of C within intact maize roots (Zea mays L.) was studied in sterile solution culture. Using metabolic inhibitors it was shown that roots could take up sugars against the concentration gradient probably via H+-ATPase dependent plasmalemma proton cotransporters. In contrast to this, no evidence was found for an ATPase mediated efflux of sugars from the root. All parts of the root were capable of taking up exogenous sugars. Examination of sugar exudation sites along the root slowed efflux at all locations, with the amount of efflux linearly correlated with internal cellular concentration. The results clearly indicated that the influxefflux mechanisms are linked both spatially, temporally and with respect to the sugars capable of transportation. The turnover of C within the root was found to be extremely rapid with turnover of the soluble sugar pool being 0.8 to 15 times daily depending on root spatial location. The results strongly suggest that the recapture of sugars from outside the root plays an important role in regulating the amount of C lost to the soil which in turn will reduce both pathogen attraction and the size of the rhizosphere microbial population and will also increase the plant's C efficiency.
AB - The influx and efflux of sugar-C and the cycling of C within intact maize roots (Zea mays L.) was studied in sterile solution culture. Using metabolic inhibitors it was shown that roots could take up sugars against the concentration gradient probably via H+-ATPase dependent plasmalemma proton cotransporters. In contrast to this, no evidence was found for an ATPase mediated efflux of sugars from the root. All parts of the root were capable of taking up exogenous sugars. Examination of sugar exudation sites along the root slowed efflux at all locations, with the amount of efflux linearly correlated with internal cellular concentration. The results clearly indicated that the influxefflux mechanisms are linked both spatially, temporally and with respect to the sugars capable of transportation. The turnover of C within the root was found to be extremely rapid with turnover of the soluble sugar pool being 0.8 to 15 times daily depending on root spatial location. The results strongly suggest that the recapture of sugars from outside the root plays an important role in regulating the amount of C lost to the soil which in turn will reduce both pathogen attraction and the size of the rhizosphere microbial population and will also increase the plant's C efficiency.
KW - carbon flow
KW - maize
KW - rhizosphere
KW - root
KW - sugar
U2 - 10.1007/BF00011173
DO - 10.1007/BF00011173
M3 - Article
VL - 178
SP - 153
EP - 160
JO - Plant and Soil
JF - Plant and Soil
SN - 0032-079X
IS - 1
ER -