Abstract
Symbiotic N2 fixation in legumes is the culmination of a complex interaction involving host, Rhizobium, and environment. For fixation to occur, the Rhizobium must find its way into the rhizosphere of an appropriate host, multiply and induce root hair curling be recognized by the plant and gain access to the root system, localize and multiply within root cells, undergo specific structural changes, and receive energy from the plant. Obviously there are many stages in this sequence which can be affected by the host, justifying the contention of Holl and La Rue (1975) that genetic manipulation of the host offers the greatest potential to enhance levels of symbiotic N2 fixation in legumes.
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