1)Describe how Rhizobium infects members of the Fabaceae and how
the subsequent relationship between the bacteria...
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Biology
1)Describe how Rhizobium infects members of the Fabaceae and howthe subsequent relationship between the bacteria and plant benefitsboth organisms. 100 marks
2) Ferns are vascular plants but they are predominantly found inhumid habitats, explain why this is the case.100 marks
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1 When legume plants require nitrogen their roots release flavonoids Rhizobium is sensitive to these molecules and activate product of nodD gene a transcription factor that controls the expression of genes involved in the synthesis of the Nod Factor NF NFs are secreted LCO whose modifications depends upon speciesfrom which they areproduced whichdetermines host plant this process requires anaerobic conditions ie absence of traces of oxygen as nitrogenase enzyme responsible for this is irreversibly inactivated by aerobic conditiions in aerobic conditions nitogenase enzyme need to be protected To combat this root nodules are formed ro limit oxygen exposure Iin certaiin plants like fabaceae family This symbiotic nitrogen fixation is restricted to a limited number of bacterial groups including rhizobiumfrankiaetc Infection proceed by Root hairs formation they elongate through the process of tip growth Infection threads develop from growing root hairs are thought
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