Journal ArticleDOI
Quantitative estimation of root exudation of maize plants
Th. Haller,H. Stolp +1 more
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The rate of root exudation of maize plants was estimated by measuring the rate of denitrification in a hermetically sealed root system and it was revealed that about 25% of the organic matter flowing into the root system was excreted into the rhizosphere.Abstract:
The rate of root exudation of maize plants was estimated by measuring the rate of denitrification in a hermetically sealed root system. While CO2 production measured in the rhizosphere results both from root respiration and microbial respiration N2O production during nitrate respiration is solely related to the amount of root exudates available for bacterial degradation. With 4 week old plants growing in quartz sand or soil root exudation amounted to 7% of the net photosynthates. Calculations revealed that about 25% of the organic matter flowing into the root system was excreted into the rhizosphere.read more
Citations
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Journal ArticleDOI
Rhizosphere carbon flow in trees, in comparison with annual plants: the importance of root exudation and its impact on microbial activity and nutrient availability
TL;DR: It is demonstrated that root exudates are an important component of carbon loss from plants and that they may have a more important role in nutrient acquisition and plant growth than previously thought.
Journal ArticleDOI
Citric acid excretion and precipitation of calcium citrate in the rhizosphere of white lupin (Lupinus albus L.)
TL;DR: The strong acidification of the rhizosphere and the cation/anion uptake ratio of the plants strongly suggests that proteoid roots of white lupin excrete citric acid, rather than citrate, into the Rhizosphere leading to intensive chemical extraction of a limited soil volume.
Journal ArticleDOI
Time lag between photosynthesis and carbon dioxide efflux from soil: a review of mechanisms and controls
Yakov Kuzyakov,Olga Gavrichkova +1 more
TL;DR: It is concluded that studies of CO2 fluxes from soil, especially in ecosystems with a high contribution of root-derived CO2, should consider photosynthesis as one of the main drivers of C fluxes, and calls for incorporating photosynthesis in soil C turnover models.
Journal ArticleDOI
Annual carbon dioxide exchange in irrigated and rainfed maize-based agroecosystems
Shashi B. Verma,Achim Dobermann,Kenneth G. Cassman,Daniel T. Walters,Johannes M. H. Knops,Timothy J. Arkebauer,Andrew E. Suyker,George Burba,Brigid Amos,Haishun Yang,Daniel Ginting,Kenneth G. Hubbard,Anatoly A. Gitelson,Elizabeth A. Walter-Shea +13 more
TL;DR: In this article, the authors quantified CO2 exchange in maize-soybean agroecosystems employing year-round tower eddy covariance flux systems and measurements of soil C stocks, CO2 fluxes from the soil surface, plant biomass, and litter decomposition.
Journal ArticleDOI
Utilising the Synergy between Plants and Rhizosphere Microorganisms to Enhance Breakdown of Organic Pollutants in the Environment (15 pp)
TL;DR: Plant-microbial interactions in the rhizosphere offer very useful means for remediating environments contaminated with recalcitrant organic compounds and will provide a basis for improving the efficacy of biological remediations.
References
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Journal ArticleDOI
Acetylene inhibition of nitrous oxide reduction by denitrifying bacteria.
Tadashi Yoshinari,Roger Knowles +1 more
TL;DR: The data are consistent with the view that N/ Sub 2/O is an obligatory intermediate in the reduction of NO/sub 2//sup -/ to N/ sub 2/ in all of the three organisms studied.
Journal ArticleDOI
Factors influencing the loss of organic carbon from wheat roots
TL;DR: It is proposed that a major loss of root carbon resulted from autolysis of the root cortex, apparently without penetration of the plant cell walls, in wheat plants grown in an atmosphere containing 14CO2 for periods from 3–8 weeks.
Journal ArticleDOI
Rates of Respiration and of Increase in Structural Dry Matter in Young Wheat, Ryegrass and Maize Plants in Relation to Temperature, to Water Stress and to Their Sugar Content
Journal ArticleDOI
Exudation of Water-soluble Vitamins and of Some Carbohydrates by Intact Roots of Maize Seedlings (Zea mays L.) into a Mineral Nutrient Solution
TL;DR: In this article, the concentration of water-soluble vitamins (thiamine, riboflavin, pyridoxine, niacin, pantothenic acid) and some sugars (glucose, fructose, sucrose, maltose) in the exudates and in the roots of maize seedlings grown for 5 days under sterile conditions in nutrient solution, with or without glass-ballotini, was determined and related to the whole plant, the root dry matter and the dry matter of the total exudate
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