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Plant growth‐altering effects of Azospirillum brasilense and Bacillus C–11–25 on two wheat cultivars
Author(s) -
Kucey R.M.N.
Publication year - 1988
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1988.tb03375.x
Subject(s) - gibberellic acid , azospirillum brasilense , bacteria , inoculation , cultivar , biology , nitrogen fixation , cytokinin , horticulture , microbial inoculant , botany , auxin , biochemistry , genetics , germination , gene
The effect of Azospirillum brasilense Cd, Bacillus C–11–25, indole acetic acid, gibberellic acid and cytokinin on plant growth characteristics of two wheat ( Triticum aestivum L. emend Thell) cultivars was studied under laboratory and greenhouse conditions. Responses of wheat plants to bacterial inoculation were similar to those caused by the addition of gibberellic acid in growth pouches. Chester and Fielder wheat varieties differed in responses to the bacteria and hormone additions. When added to growth pouches, bacterial culture filtrates and dead bacterial cells caused plant growth responses similar to those caused by the addition of live cells. Bacteria and hormone additions resulted in increased permeability of Fielder wheat to 15 Nlabelled nitrate, and decreased nitrate permeability of Chester wheat. Bacterial inoculation of soil in pots caused 15 N isotope dilution in Fielder but not in Chester wheat. Hormone addition to pots caused isotope dilution in Chester wheat. It appeared that genetic differences between cultivars affected plant growth responses. The accuracy of estimates of N 2 fixation by associative bacteria based on 15 N isotope dilution calculations may be reduced if control plants differ in plant response to these bacteria.