Rice root exudates

Tsai, T. C., and S. H. Chen. The structure identification of two major antho-cyanins in wu-no-tao (Oryza sadva). ShipinKexue 1996 23(3) 444-452. Bouillant, M. L., C. Jacoud, I. Zanella, ]. Favre-Bonvin, and R. Bally. Identification of 5 (12-heptadecenyO-resor-cinol in rice root exudates. Phytochemistry 1994 35(3) 769-771. 

Seal AN, Pratley JE, Haig T, An M. 2004. Identification and quantitation of compounds in a series of allelopathic and non-allelopathic rice root exudates. J Chem Ecol 30 1647-1662. 

Kato-Noguchi, H., Ino, T., Sata, N., Yamamura, S. Isolation and identification of apotent allelopathic substance in rice root exudates. Physiol Planta 2002 115 401-405. 

Bouillant, M.L. et al. (1994) Identification of 5-(12-heptadecenyl)-resorcinol in rice root exudates. Phytochemistry 35,... 

Despite increased citrate accumulation in roots of Zn-deficient rice plants, root exudation of citrate was not enhanced. However, in distinct adapted rice cultivars, enhanced release of citrate could be observed in the presence of high bicarbonate concentrations in the rooting medium, a stress factor, which is frequently associated with Fe and Zn deficiency in calcareous soils (235) (Hajibo-huid, unpublished). This bicarbonate-induced citrate exudation has been related to improved Zn acquisition in bicarbonate-tolerant and Zn-efficient rice genotypes (Fig. 9) (23S). Increased exudation of sugars, amino acids, and phenolic compounds in response to Zn deficiency has been reported for various dicotyledonous and monocotyledonous plant species and seems to be related to increased... 

T. Heulin, A. Gukert, and J. Balandreau, Stimulation of root exudation of rice seedlings by Azospirilluin strains carbon budget under gnotobiotic conditions. Biology and Fertility of Soils 4 9 (1987). 

Aulakh MS, Wassmann R, Bueno C, Kreuzwieser J, Rennenberg H. Characterization of root exudates at different growth stages of ten rice (Oryza sativa L.) cultivars. Plant Biol. 2001 3 139-148. 

Aulakh MS, Wassmann R, Bueno C, Rennenberg H. Impact of root exudates of different cultivars and plant development stages of rice (Oryza satiza L.) on methane production in a paddy soil. Plant Soil 2001 230 77-86. 

Lu Y, Wassmann R, Neue HU, Huang C. Impact of phosphorus supply on root exudation, aerenchyma formation and methane emission of rice plants. Biogeochemistry. 1999 47 203-218. 

Allelopathy is defined as biochemical interactions between one plant or microorganism (alga, bacteria, or virus) and another plant through the production of chemical compounds - secondary metabolites (allelochemicals), which influence, direct or indirect, harmful or beneficial, plant growth and development (Rice 1984). Allelochemicals are present in almost all plants and in many tissues, like leaves, stems, flowers, fruits, seeds, roots, or pollen and may be released from plants into the environment by volatilization, leaching, root exudation, and decomposition of plant residues (Chou 1990). 

Bacilio-Jimenez, M., Aguilar-Flores, S., Ventura-Zapata, E., Peres-Campos, E., Bouquelet, S., and Zeteno, E. (2003). Chemical characterization of root exudates from rice (Oryza sativa ) and their effects on the chemotactic response of endophytic bacteria. Plant Soil 249, 271-277. 

Molybdenum indirectly stimulates microbial activity in the plant rhizosphere by promoting root exudation. Foliar application of Mo was found to increase the concentrations of free amino acids, reducing sugars (arabinose), and organic acids in the rhizosphere soil of a rice crop... 

Bacillus sp. isolated fh>m rice rhizosphere was capable of growth on oil residues, but only in the presence of root exudates. 

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