The Role of Plant Compounds in the Regulation of Rhizobium Nodulation Genes
Members of the genus Rhizobium are soil bacteria capable of forming symbiotic nitrogen fixing nodules with leguminous plants. Individual species of bacteria have a defined host-range; they are able to form nodules on a limited number of plant species.1 The bacteria invade the plant root through an emerging root hair causing the root hair to curl. The bacteria penetrate through several cell layers into the root via an infection thread which is a tube-like structure of plant cell wall.2 Early during the invasion process, in advance of the invading infection thread, inner cortical cells are stimulated to divide by the bacteria.3 It is apparent from this process that there is an ordered and specific exchange of biochemical signals between the plant and the invading bacteria.
KeywordsInduce Activity Rhizobium Leguminosarum Infection Thread Rhizobium Species Plant Exudate
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