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Influence of 5 methyltryptophan resistant bradyrhizobium japonicum on soybean root nodule iaa content

Influence of 5 methyltryptophan resistant bradyrhizobium japonicum on soybean root nodule iaa content

Applied & Environmental Microbiology 53(5): 1051-1055

Bradyrhizobium japonicum mutants resistant to 5-methyltryptophan were isolated. Some of these mutants were found to accumulate indole-3-acetic acid (IAA) and tryptophan in culture. In greenhouse studies, nodules from control plants inoculated with wild-type bradyhizobia contained 0.04, 0.10, and 0.58 .mu.g of free, ester-linked, and peptidyl IAA g (fresh weight) of nodules-1, respectively. Nodules from plants inoculated with 5-methyltryptophan-resistant bradyrhizobia contained 0.94. 1.30, and 10.6 .mu.g of free, ester-linked, and peptidyl IAA g (fresh weight) of nodules-1, respectively. This increase in nodule IAA content indicates that the Bradyrhizobium inoculum can have a considerable influence on the endogenous IAA level of the nodule. Further, these data imply that much of the IAA that accumulated in the high-IAA-containing nodules was of bacterial rather than plant origin. These high-IAA-producing 5-menthyltryptophan-resistant bacteria were poor symbiotic nitrogen fixers. Plants inoculated with these bacteria had a lower nodule mass and fixed less nitrogen per gram of nodule than did plants inoculated with wild-type bacteria.

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