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147 - 158
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The combined use of 2,4-dichlorophenoxyacetic acid (2,4-D) - the plant growth-regulator, and Pseudomonas caryophylli, a rhizospheric associative diazotroph that normally lacks the ability to form nodules on plants roots, led to the appearance of a new plant-bacterial nitrogen-fixing symbiotic system with rape as the host. The infection of nodule-like structures (para-nodules) induced by 2,4-D on rape roots by Ps. caryophylli strain has been obtained. Close interrelations revealed between the partners in the endosymbiosis are expressed both cytologically and physiologically. Penetration of the bacteria within nodule-like structures and their location in plant cell periplasm have been found out. High nitrogen-fixing activity of the system testifies to the fact that Ps. caryophylli cells are in active form within para-nodules.
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