why do alnus and casuarina don't have rhizobium in their root nodules
Answers
Answer:
about alnus and casuarina
Explanation:
nodulation-dependent detection methods have increasingly been supplemented or replaced with molecular methods, which are powerful tools to analyze Frankia populations directly in their habitat. Such an in situ analysis is unaffected by the limitations of culturability because sequences of DNA or ribosomal RNA (rRNA) rather than the microbial growth are targeted. The feasibility of molecular approaches for the in situ analysis of Frankia populations, however, is most influenced by the target organism and the heterogeneity of the habitat. The analysis is more difficult in highly heterogeneous habitats such as pristine forest soils which contain a high diversity of small numbers of physiologically active and inactive bacterial populations (5000–6000 genomes g−1 soil (dry weight)). Consequently, the majority of studies on Frankia populations have been focused on pure cultures and uncultured endophytes in nodules which comprise monoxenic enrichments of one physiologically active bacterial population.
Answer:
hey mate here is your answer
Explanation:
They contain symbotic bacteria called rizobia within the noudles, producing nitrogen compounds that help the plant to grow and complete with other plants. When the plant dies , the fixed nitrogen is released, making it available to all plants and this helps to fertilize the soil.