caa a22 4500 477110339 CHVBK 20180405111607.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00011173 doi (NATIONALLICENCE)springer-10.1007/BF00011173 Re-sorption of organic compounds by roots of Zea mays L. and its consequences in the rhizosphere [Elektronische Daten] III. Characteristics of sugar influx and efflux [David Jones, Peter Darrah] 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. Kluwer Academic Publishers, 1996 carbon flow nationallicence maize nationallicence rhizosphere nationallicence root nationallicence sugar nationallicence Jones David US Plant, Soil and Nutrition Lab., Cornell University, 14853, Ithaca, NY, USA aut Darrah Peter US Plant, Soil and Nutrition Lab., Cornell University, 14853, Ithaca, NY, USA aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 178/1(1996-01-01), 153-160 0032-079X 178:1<153 1996 178 11104 https://doi.org/10.1007/BF00011173 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011173 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jones David US Plant, Soil and Nutrition Lab., Cornell University, 14853, Ithaca, NY, USA aut NATIONALLICENCE 700 1- Darrah Peter US Plant, Soil and Nutrition Lab., Cornell University, 14853, Ithaca, NY, USA aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 178/1(1996-01-01), 153-160 0032-079X 178:1<153 1996 178 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer