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Nodule-like structures (para-nodules) can be induced in wheat roots by low concentrationsof 2,4-dichlorophenoxyacetic acid (2,4-D), a synthetic analogue of the plant growth hor-mone indole-acetic acid. Growth of nodulated wheat plants was not affected by 2,4-D treat-ment. Infection of these?para-nodules by adding oxygen-tolerant Azorhizobium caulinodans isolat-ed from stem nodules of the tropical legume Sesbania rostrata resulted in massive prolifera-tion of bacterial cells in the intercellular spaces as well as inside the para-nodular cells.Para-nodules colonized by Azorhizobium coulinodans not only reduced acetylene, but alsotransferred fixed nitrogen to the plant, contributing up to 16--23% of the nitrogen budgetof infected wheat.
Nodule-like structures (para-nodules) can be induced in wheat roots by low concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D), a synthetic analogue of the plant growth hor-mone indole-acetic acid. Growth of nodulated Infection of these? para-nodules by adding oxygen-tolerant Azorhizobium caulinodans isolat-ed from stem nodules of the tropical legume Sesbania rostrata resulted in massive prolifera tion of bacterial cells in the intercellular spaces as well as inside the para-nodular cells. Para-nodules colonized by Azorhizobium coulinodans only reduced acetylene, but alsotransferred fixed nitrogen to the plant, contribute up to 16-23% of the nitrogen budgetof infected wheat.