caa a22 4500 477112447 CHVBK 20180405111613.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00011442 doi (NATIONALLICENCE)springer-10.1007/BF00011442 Plant genotype, micronutrient fertilization and take-all infection influence bacterial populations in the rhizosphere of wheat [Elektronische Daten] [Z. Rengel, R. Gutteridge, P. Hirsch, D. Hornby] The relationship between micronutrient efficiency of four wheat (Triticum aestivum L.) genotypes, tolerance to take-all disease (caused by Gaeumannomyces graminis (Sacc.) Arx and Olivier var. tritici Walker), and bacterial populations in the rhizosphere was tested in soil fertilized differentially with Zn and Mn. Plant growth was reduced by Mn or Zn deficiency and also by take-all. There was an inverse relationship between micronutrient efficiency of wheat genotypes when grown in deficient soils and the length of take-all lesions on roots (efficient genotypes had shorter lesions than inefficient ones). In comparison to the rhizosphere of control plants of genotypes Aroona and C8MM receiving sufficient Mn and Zn, the total numbers of bacterial cfu (colony forming units) were greater in the rhizosphere of Zn-efficient genotype Aroona under Zn deficiency and in Mn-efficient genotype C8MM under Mn deficiency. These effects were not observed in other genotypes. Take-all decreased the number of bacterial cfu in the rhizosphere of fully-fertilized plants but not of those subjected to either Mn or Zn deficiency. In contrast, the Zn deficiency treatment acted synergistically with take-all to increase the number of fluorescent pseudomonads in the rhizosphere. Although numbers of Mn-oxidising and Mn-reducing bacteria were generally low, take-all disease increased the number of Mn reducers in the rhizosphere of Mn-efficient genotypes Aroona and C8MM. Under Mn-deficiency conditions, the number of Mn reducers in the rhizosphere increased in Aroona but not in C8MM wheat. The results suggest that bacterial microflora may play a role in the expression of Mn and Zn efficiency and tolerance to take-all in some wheat genotypes. Kluwer Academic Publishers, 1996 Gaeumannomyces graminis var. tritici nationallicence manganese nationallicence microorganisms nationallicence nutrient deficiency nationallicence rhizosphere nationallicence roots nationallicence Triticum aestivum nationallicence zinc nationallicence Rengel Z. Soil Science and Plant Nutrition, Faculty of Agriculture, University of Western Australia, 6907, Perth, WA, Australia aut Gutteridge R. Crop and Disease Management Department, IACR-Rothamsted, AL5 2JQ, Harpenden, Herts, UK aut Hirsch P. Soil Science, Department, IACR-Rothamsted, AL5 2JQ, Harpenden, Herts, UK aut Hornby D. Crop and Disease Management Department, IACR-Rothamsted, AL5 2JQ, Harpenden, Herts, UK aut Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 183/2(1996-09-01), 269-277 0032-079X 183:2<269 1996 183 11104 https://doi.org/10.1007/BF00011442 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011442 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rengel Z. Soil Science and Plant Nutrition, Faculty of Agriculture, University of Western Australia, 6907, Perth, WA, Australia aut NATIONALLICENCE 700 1- Gutteridge R. Crop and Disease Management Department, IACR-Rothamsted, AL5 2JQ, Harpenden, Herts, UK aut NATIONALLICENCE 700 1- Hirsch P. Soil Science, Department, IACR-Rothamsted, AL5 2JQ, Harpenden, Herts, UK aut NATIONALLICENCE 700 1- Hornby D. Crop and Disease Management Department, IACR-Rothamsted, AL5 2JQ, Harpenden, Herts, UK aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 183/2(1996-09-01), 269-277 0032-079X 183:2<269 1996 183 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer