Prokaryotic plant parasites

Article Abstract:

Parasitism as applied to prokaryote - plant interactions occurs when a parasite lives with a host and exploits its resources at source level. The study of prokaryotes owes its current disciplinary drive to bacterial molecular genetics, and reveals genetic clues to widely used prokaryotic pathogenesis components and commonly used plant resistance mechanisms. Prokaryotic parasites differ from ordinary parasites in that the former shares the task of procuring food with the host. Some prokaryotic parasites even convert molecular nitrogen into ammonia in exchange for the carbohydrates they consume.

Plants, Plants (Organisms), Prokaryotes, Host-parasite relationships

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Calcium spiking in plant root hairs responding to Rhizobium nodulation signals

Article Abstract:

Calcium (Ca) spiking in alfalfa root hair responding to Rhizobium lipochitooligosaccharide nodulation signal molecules are localized and periodic in nature. The application of the signal molecules in these root hair is followed by a lag period before spike formation. The signal molecules' structural features necessary for nodulation responses are also essential for Ca spike formation in alfalfa. Most of the Ca accumulates in the cytoplasm near the nucleus. Ca acts as a secondary messenger in the nodulation signal transduction.

Observations, Rhizobium, Cellular signal transduction, Calcium, Calcium (Chemical element), Alfalfa, Root hairs, Root-tubercles, Root tubercles

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Rhizobium meliloti genes involved in sulfate activation: the two copies of nodPQ and a new locus, saa

Article Abstract:

A study was conducted to examine the mapping and cloning of nodulation genes in Rhizobium meliloti and its location on the pSym-b megaplasmid. Rhizobium meliloti, a nitrogen-fixing symbiont, fixes nodules on leguminous host plants. The process involves nodulation genes clustered on the symbiont's pSym-a megaplasmid. Mutation and deletion of these genes indicate another locus, sulfur amino acid, in R meliloti.

Cloning, Chromosome mapping, Amino acids, Rhizobium meliloti

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