Alleviation of nitrate inhibition of soybean nodulation by high inoculum does not involve bacterial nitrate metabolism |
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| Authors: | Charles G R Lawson Bernard J Carroll Peter M Gresshoff |
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| Institution: | (1) Botany Department, Australian National University, 2601 Canberra, A.C.T., Australia;(2) Present address: Plant Molecular Genetics (OHLD), College of Agriculture, University of Tennessee, 37901 Knoxville, TN, USA |
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| Abstract: | Inoculation of soybean (Glycine max. cv. Bragg) plants with high level inoculum partially alleviated the nitrate inhibition of nodule formation (3 to 4 fold), but not nodule growth. This alleviation did not require the bacterial nitrate reductase asBradyrhizobium japonicum mutant strains 110CR1 and 110CR2 (both lacking assimilatory nitrate reductase activity) gave the same results as the wild type parent 311b110. The study was carried out in the glasshouse, thereby confirming preliminary field data by Herridgeet al. (1984) using a wild type bacterial inoculant. |
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| Keywords: | nitrate inhibition nitrate reductase nodulation rhizosphere |
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