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Effects of Prevention of Flowering on the Growth of Bean Plants Inoculated with an "Ineffective" Strain of Rhizobium phaseoli

Roots of Phaseolus vulgaris `Light Red Kidney,' inoculated with Rhizobium phaseoli strain 14c, produced ineffective nodules. Apex removal from inoculated plants prior to transition to flowering resulted in increased vegetative growth and nitrogenase (acetylene reduction) activity, delayed leaf and nodule senescence, and a greater accumulation of nitrogen in shoots of treated plants than in the ineffectively nodulated control plants. Nodule tissue from treated plants also appeared less disrupted cytologically than that of controls. The peribacteroid membrane was usually intact; few membrane fragments or vesicles were associated with it. The cytoplasm was homogeneous and electron opaque with few Golgi bodies and short segments of rough endoplasmic reticulum. Prevention of flowering in the ineffective association may make the symbiosis more effective by altering source-sink relationships within the plant.