Inoculation of field-grown wheat (Triticum aestivum) with Azospirillum spp. in Brazil |
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Authors: | V L D Baldani J I Baldani J Döbereiner |
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Institution: | (1) M. A.-EMBRAPA-Unidade de Apoio ao Programa Nacional de Pesquisa em Biologia do Solo, 23851 Seropédica, Rio de Janeiro, Brazil |
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Abstract: | Summary Three field experiments with wheat were conducted in 1983, 1984, and 1985 in Terra Roxa soil in Paraná, the major Brazilian wheat-growing region, to study inoculation effects of various strains of Azospirillum brasilense and A. amazonense. In all three experiments inoculation with A. brasilense Sp 245 isolated from surface-sterilized wheat roots in Paraná produced the highest plant dry weights and highest N% in plant tops and grain. Grain yield increases with this strain were up to 31 % but were not significant. The application of 60 or 100 kg N ha–1 to the controls increased N accumulation and produced yields less than inoculation with this strain. Another A. brasilense strain from surface-sterilized wheat roots (Sp 107st) also produced increased N assimilation at the lower N fertilizer level but reduced dry weights at the high N level, while strain Sp 7 + Cd reduced dry weights and N% in the straw at both N levels. The A. amazonense strain isolated from washed roots and a nitrate reductase negative mutant of strain Sp 245 were ineffective. Strains Sp 245 and Sp 107st showed the best establishment within roots while strain Cd established only in the soil. |
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Keywords: | Azospirillum brasilense Azospirillum amazonense rate reductase Inoculation Wheat Triticum aestivum |
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