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Substrate flow in the rhizosphere

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Abstract

The major source of substrates for microbial activity in the ectorhizosphere and on the rhizoplane are rhizodeposition products. They are composed of exudates, lysates, mucilage, secretions and dead cell material, as well as gases including respiratory CO2. Depending on plant species, age and environmental conditions, these can account for up to 40% (or more) of the dry matter produced by plants. The microbial populations colonizing the endorhizosphere, including mycorrhizae, pathogens and symbiotic N2-fixers have greater access to the total pool of carbon including that recently derived from photosynthesis. Utilization of rhizodeposition products induces at least a transient increase in soil biomass but a sustained increase depends on the state of the native soil biomass, the flow of other metabolites from the soil to the rhizosphere and the water relations of the soil. In addition, the phenomena of oligotrophy, cryptic growth, plasmolysis, dormancy and arrested metabolism can all influence the longevity of rhizosphere organisms. With this background, microbial growth in the rhizosphere will be discussed.

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References

  • Anderson T-H and Domsch K H 1985 Determination of ecophysiological maintenance requirements of soil micro-organisms in a dormant state. Biol. Fertil. Soils 1, 81–89.

    Google Scholar 

  • Ares J 1976 Dynamics of the root system of blue grama (Bouteloua gracilis (H.S.K.) Lag.). J. Range Manage. 29, 208–213.

    Google Scholar 

  • Barber D A and Lynch, J M 1977 Microbial growth in the rhizosphere. Soil Biol. Biochem. 9, 305–308.

    Google Scholar 

  • Barber D A and Martin, J K 1976 The release of organic substances by cereal roots in soil. New Phytol. 76, 69–80.

    Google Scholar 

  • Barber S A 1971 Effect of tillage practice on corn (Zea mays L.) root distribution and morphology. Agron. J. 63, 724–726.

    Google Scholar 

  • Barneix A J, Breteler H and Van deGeijn, S C 1984 Gas and ion exchanges in wheat roots after nitrogen supply. Physiol. Plant 61, 357–362.

    Google Scholar 

  • Bayne H G, Brown M S and Bethlenfalvay, G J 1984 Defoliation effects on mycorrhizal colonization, nitrogen fixation and photosynthesis in the Glycine-Glomus-Rhizobium symbiosis. Physiol. Plant. 62, 576–580.

    Google Scholar 

  • Bazin M J, Markham P, Scott E and Lynch, J M 1990 Microbial interactions in the rhizosphere. In The Rhizosphere. Ed. J. MLynch. pp 99–127. John Wiley, Chichester.

    Google Scholar 

  • Beck S M and Gilmour C M 1983 Role of wheat root exudates in associative nitrogen fixation. Soil. Biol. Biochem. 15, 33–38.

    Google Scholar 

  • Bildusas I J, Dixon R K, Pfleger F L and Stewart, E L 1986 Growth, nutrition and gas exchange of Bromus inermis inoculated with Glomus fasciculatum. New Phytol. 102, 303–311.

    Google Scholar 

  • Bottner P, Sallih Z and Billies G 1988 Root activity and carbon metabolism in soils. Biol. Fertil. Soils 7, 71–78.

    Google Scholar 

  • Chapman S J and Gray T R G 1981 Endogenous metabolism and macromolecular composition of Arthobacter globiformis. Soil Biol. Biochem. 13, 11–18.

    Google Scholar 

  • Chapman S J and Lynch J M 1985 Some properties of polsaccharides of microorganisms from degraded straw. Enzyme Microb. Technol. 7, 161–163.

    Google Scholar 

  • Doran J W 1987 Microbial biomass and mineralizable nitrogen distributions in no-tillage and plowed soils. Biol. Fertil. Soils 5, 68–75.

    Google Scholar 

  • Dormaar J F and Sauerbeck D R 1983 Seasonal effects of photoassimilated carbon-14 in the root system of blue grama and associated soil organic matter. Soil Biol. Biochem. 15, 475–479.

    Google Scholar 

  • Fogel R 1985 Roots as primary producers in below-grown ecosystems. In Ecological Interactions in Soil. Plants, Microbes and Animals. Eds. A HFitter, DAtkinson, D JRead and M BUsher. pp 23–26. Blackwell Scientific Publications, Oxford.

    Google Scholar 

  • Fogel R and Hunt G 1983 Contribution of mycorrhizae and soil fungi to nutrient cycling in a Douglas-fir ecosystem. Can. J. For. Res. 12, 219–232.

    Google Scholar 

  • Graham J T, Leonard R T and Menge J A 1981 Membrane-mediated decrease in root exudation responsible for phosphorus inhibition of vesicular-arbuscular mycorrhiza formation. Plant Physiol. 68, 548–552.

    Google Scholar 

  • Gregory P J, McGowan M, Biscoe P V and Hunt B 1978 Water relations of winter wheat. 1. Growth of the root system. J. Agric. Sci. 91, 91–102.

    Google Scholar 

  • Hale M G and Moore L D 1979 Factors affecting root exudation. II: 1970–1978. Adv. Agron. 31, 93–124.

    Google Scholar 

  • Harris D, Pacovsky R S and Paul E A 1985 Carbon economy of soybean-Rhizobium-Glomus association. New Phytol. 101, 427–440.

    Google Scholar 

  • Helal H M and Sauerbeck D R 1983 Method to study turnover processes in soil layers of different proximity to roots. Soil Biol. Biochem. 15, 223–225.

    Google Scholar 

  • Helal H M and Sauerbeck D R 1986 Effect of plant roots on carbon metabolism of soil microbial biomass. Z. Pflanzenernaehr. Bodenkd. 149, 181–188.

    Google Scholar 

  • Herold A 1980 Regulation of photosynthesis by sink activity-the missing link. New Phytol. 86, 131–144.

    Google Scholar 

  • Jenkinson D S and Powlson, D S 1976 The effects of biocidal treatments on metabolism in soil. V. A method for measuring soil biomass. Soil Biol. Biochem. 8, 209–213.

    Google Scholar 

  • Jenkinson D S and Powlson D S 1980 Measurement of microbial biomass in intact soil cores and in sieved soil. Soil Biol. Biochem. 12, 579–581.

    Google Scholar 

  • Johnen B G and Sauerbeck D R 1977 A tracer technique for measuring growth, mass and microbial breakdown of plant roots during vegetation. In Soil Organisms as Components of Ecosystems. Eds. V Lohm and T Persson. Proc. VI Int. Soil. Zoo. Coll. Ecol. Bull. Stockholm 25, 366–373.

  • Keith H, Oades J M and Martin J K 1986 Input of carbon to soil from wheat plants. Soil Biol. Biochem. 18, 445–449.

    Google Scholar 

  • Kleeberger A, Castorph H and Klingmuller W 1983 The rhizosphere microflora of wheat and barley with special reference to Gram negative bacteria. Arch. Microbiol. 136, 306–311.

    Google Scholar 

  • Koch K E and Johnson C R 1984 Photosynthate partitioning in split-root citrus seedlings with mycorrhizal and non-mycorrhizal root systems. Plant Physiol. 75, 26–30.

    Google Scholar 

  • Kraffczyk I, Trolldenier G and Beringer H 1984 Soluble root exudates of maize: influence of potassium supply and rhizosphere micro-organisms. Soil Biol. Biochem. 16, 315–322.

    Google Scholar 

  • Kucera C L, Dahlman R C and Koelling M R 1967 Total net productivity and turnover on an energy basis for tallgrass prairie. Ecology 48, 536–541.

    Google Scholar 

  • Lambers H 1980 The physiological significance of cyanide-resistant respiration in higher plants. Plant Cell Environ. 3, 293–302.

    Google Scholar 

  • Lambers H 1987 Growth, respiration, exudation and symbiotic associations: the fate of carbon translocated to the roots. In Root Development and Function. Eds. P JGregory, J VLake and D ARose. pp 125–145. Cambridge University Press, Cambridge.

    Google Scholar 

  • Lappin-Scott H M, Cusack F, Macleod A and Costerton J W 1988 Starvation and nutrient resuscitation of Klebsiella pneumoniae isolated from oil well waters. J. Appl. Bacteriol. 64, 541–549.

    Google Scholar 

  • Lee K J and Gaskins M H 1982 Increased root exudation of 14C-compounds by sorghum seedlings inoculated with nitrogen-fixing bacteria. Plant and Soil 69, 391–399.

    Google Scholar 

  • Lynch J M 1976 Products of soil micro-organisms in relation to plant growth CRC Crit. Revs Microbiol. 5, 67–107.

    Google Scholar 

  • Lynch J M 1986 Rhizosphere microbiology and its manipulation. Biol. Agric. Hort. 3, 143–152.

    Google Scholar 

  • Lynch J M 1989 Development and interactions between microbial communities on the root surface. In Interrelations Between Micro-organisms and Plants in Soil. Eds. VVančura and FKunc. pp 5–12 Academic, Prague and Elsevier, Amsterdam.

    Google Scholar 

  • Lynch J M 1990 Microbial metabolites. In The Rhizosphere. Ed. J MLynch. pp 177–206. John Wiley, Chichester.

    Google Scholar 

  • Lynch J M and Panting L M 1980a Cultivation and the soil biomass. Soil Biol. Biochem. 12, 29–33.

    Google Scholar 

  • Lynch J M and Panting L M 1980b Variations in the size the soil biomass. Soil Biol. Biochem. 12, 547–550.

    Google Scholar 

  • Lynch J M and Panting L M 1981 Measurement of the microbial biomass in intact cores of soil. Microbial Ecol. 7, 229–234.

    Google Scholar 

  • Martens R 1985 Limitations in the application of the fumigation technique for biomass estimations in amended soils. Soil Biol. Biochem. 17, 57–63.

    Google Scholar 

  • Martin J K and Foster R C 1985 A model system for studying the biochemistry and biology of the root-soil interface. Soil Biol. Biochem. 17, 261–269.

    Google Scholar 

  • Merckz R and Martin J K 1987 Extraction of microbial biomass components from rhizosphere soils. Soil Biol. Biochem. 19, 371–376.

    Google Scholar 

  • Merckz R, DenHartog A and VanVeen J A 1985 Turnover of root-derived material and related microbial biomass formation in soils of different texture. Soil Biol. Biochem. 17, 565–569.

    Google Scholar 

  • Minchin F R, Summerfield R J, Hadley P, Roberts E H and Rawsthorne S 1981 Carbon and nitrogen nutrition of nodulated roots of grain legumes. Plant Cell. Environ. 4, 5–26.

    Google Scholar 

  • Moore R and McClelen C E 1983 A morphometric analysis of cellular differentiation in the root cap of Zea mays. Am. J. Bot. 70, 611–617.

    Google Scholar 

  • Nelson A H and Sparell L 1976 Acetylene reduction (nitrogen fixation) by Enterobacteriacae isolated from paper mill process waters. Appl. Environ. Microbiol. 32, 197–205.

    Google Scholar 

  • Nelson E B, Chao W-L, Norton J M, Nash, G T and Harman, G E 1986 Attachment of Enterobacter cloacae to Pythium ultimum hyphae: possible role in the biological control of Phythium pre-emergence damping-off. Phytopathology 76, 327–335.

    Google Scholar 

  • Newman E I 1985 The rhizosphere: carbon sources and microbial populations. In Ecological Interactions in Soil: Plants, Microbes and Animals. Eds. A HFitter, DAtkinson, D JRead and M BUsher. pp 107–121. Blackwell Scientific Publications, Oxford.

    Google Scholar 

  • Pate J S, Layzell D B and Atkins C A 1979 Economy of carbon and nitrogen in a nodulated and non-nodulated (NO3-grown) legume. Plant Physiol. 64, 1083–1088.

    Google Scholar 

  • Pirt S J 1975 Principles of Microbe and Cell Cultivation. Blackwell Scientific Publications, Oxford, 274 p.

    Google Scholar 

  • Postgate J R and Hunter J R 1962 The survival of starved bacteria. J. Gen. Microbiol. 29, 233–263.

    Google Scholar 

  • Reid C P P, Kidd F A and Ekwebelam, S A 1983 Nitrogen nutrition, photosynthesis and carbon allocation in ectomycorrhizal pine. Plant and Soil 71, 415–431.

    Google Scholar 

  • Ryle G J A, Arnott R A, Powell C E and Gordon A J 1983 Comparisons of the respiratory effluxes of nodules and roots in six temperate legumes. Ann. Bot. 52, 469–477.

    Google Scholar 

  • Ryle G J A, Powell C E and Gordon A J 1979 The respiratory costs of nitrogen fixation in soyabean, cowpea and white clover. II. Comparisons of the cost of nitrogen fixation and the utilization of combined nitrogen. J. Exp. Bot. 30, 145–153.

    Google Scholar 

  • Sallih Z and Bottner P 1988 Effect of wheat (Triticum aestivum) roots on mineralization rates of soil organic matter. Biol. Fertil. Soils 7, 67–70.

    Google Scholar 

  • Santantonio D 1979 Seasonal dynamics of fine roots in mature stands of Douglas-fir of different water regimes: a preliminary report: In Root Physiology and Symbiosis. Eds. AReidacker and JGagnaie-Michard. pp 90–203. Proceedings IUFRO Symposium on Root Physiology and Symbiosis, Nancy France, 1978, Vol. 6. CNRF Champenoux, France.

    Google Scholar 

  • Schönwitz R and Ziegler, H 1982 Exudation of water-soluble vitamins and of some carbohydrates by intact roots of maize seedlings (Zea mays L.) into a mineral nutrient solution. Z Pflanzenphysiol. 107, 7–14.

    Google Scholar 

  • Sims P L and Singh J S 1971 Herbage dynamics and net primary production in certain ungrazed and grazed grasslands in North America. In Preliminary Analysis of Structure and Function in Grasslands. Ed. N RFrench. pp 59–124. Range Science Department Science Series No. 10. Colorado State University, Fort Collins, Colorado.

    Google Scholar 

  • Singh J S and Coleman D C 1974 Distribution of photoassimulated 14carbon in the root system of a shortgrass prairie. J. Ecol. 62, 359–365.

    Google Scholar 

  • Sivakumar M V K, Taylor H M and Shaw R H 1977 Top and root relations of field-grown soybeans. Agron. J. 69, 470–473.

    Google Scholar 

  • Snellgrove R C, Splittstoesser W E, Stribley D P and Tinker P B 1982 The distribution of carbon and the demand of the fungal symbiont in leek plants with vesicular-arbuscular mycorrhizas. New Phytol. 92, 75–87.

    Google Scholar 

  • Sparling G P, West A W and Whale K N 1985 Interference from plant roots in the estimation of soil microbial ATP, C, N and P. Soil Biol. Biochem. 17, 275–278.

    Google Scholar 

  • Wainwright M 1988 Metabolic diversity of fungi in relation to growth and mineral cycling in soil — a review. Trans. Br. mycol. Soc. 90, 159–170.

    Google Scholar 

  • Warembourg F R and Paul E A 1977 Seasonal transfers of assimilated 14C in grassland: plant production and turnover, soil and plant respiration. Soil Biol. Biochem. 9, 295–301.

    Google Scholar 

  • Whipps J M 1984 Environmental factors affecting the loss of carbon from the roots of wheat and barley seedlings. J. Exp. Bot. 35, 767–773.

    Google Scholar 

  • Whipps J M 1985 Effect of CO2 concentration on growth, carbon distribution and loss of carbon from the roots of maize. J. Exp. Bot. 36, 644–651.

    Google Scholar 

  • Whipps J M 1987 Carbon loss from the roots of tomato and pea seedlings grown in soil. Plant and Soil 103, 95–100.

    Google Scholar 

  • Whipps J M 1990 Carbon economy. In The Rhizosphere. Ed. J MLynch. pp 59–97. John Wiley, Chichester.

    Google Scholar 

  • Whipps J M and Lynch J M 1983 Substrate flow and utilization in the rhizosphere of cereals. New Phytol. 95, 605–623.

    Google Scholar 

  • Whipps J M and Lynch J M 1985 Energy losses by the plant in rhizodeposition. Ann. Proc. Phytochem. Soc. Eur. 26, 59–71.

    Google Scholar 

  • Whipps J M and Lynch J M 1986 The influence of the rhizosphere on crop productivity. Adv. Microb. Ecol. 9, 187–244.

    Google Scholar 

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Lynch, J.M., Whipps, J.M. Substrate flow in the rhizosphere. Plant Soil 129, 1–10 (1990). https://doi.org/10.1007/BF00011685

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