NITROGEN FIXATION.pptx

PG AND RESEARCH DEPARTMENT OF MICROBIOLOGY,SRI PARAMAKALYANI COLLEGE ALWARKURICHI.

1. SRI PARAMAKALYANI COLLEGE ( REACCREDITED WITH B GRADE WITH A CGPA OF 2.71 IN THE II CYCLE BY NACC AFFILIATED TO MANONMANIAM SUNDARANAR UNIVERSITY,THIRUNELVELI) ALWARKURICHI -627 412 TAMILNADU INDIA . POST GRADUATE & RESEARCH CENTER – DEPARTMENT OF MICROBIOLOGY (GOVERMENT AIDED) I SEM - CORE – MICROBIAL PHYSIOLOGY UNIT – 4 NITROGEN FIXATION & NIF GENE SUBMITTED TO THE GUIDE DR.S.VISWANATHAN,PH.D HEAD OF THE DEPARTMENT SRI PARAMAKALYANI COLLEGE ALWARKURICHI. SUBMITTED BY M.MOHAMED FAISEL REG.NO : 20211231516114 I M.SC, MICROBIOLOGY DATE: 06.12.2021

2. SYNOPSIS Introduction Nitrogen fixation Symbiotic N2 fixation Root noodule formation Asymbiotic N2 fixation Nitrogenous complexes Nif gene Reference

3. Nifgenes The complex of genes encoding enzymes involved in the fixation of atmospheric nitrogen. They are found in nitrogen-fixing bacteria. They occur as an operon in free-living anaerobic nitrogen-fixing bacteria such as Klebsiella pneumoniae , Rhodospirillum rubrum , and Rhodobacter capsulatus . The nif genes are genes encoding enzymes involved in the fixation of atmospheric nitrogen into a form of nitrogen available to living organisms . nif genes also encode a number of regulatory proteins involved in nitrogen fixation. The nif genes are found in both free-living nitrogen-fixing bacteria and in symbiotic bacteria associated with various plants. The nif genes are found in both free-living nitrogen-fixing bacteria and in symbiotic bacteria associated with various plants.

4. REGULATION In most bacteria, regulation of nif genes transcription is done by the nitrogen sensitive NifA protein . If there is a sufficient amount of reduced nitrogen or oxygen is present, another protein is activated .

5. REFERENCE https://byjus.com/biology/nitrogen-fixation-nitrogen-metabolism/ https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/nitrogen-fixation https://courses.lumenlearning.com/boundless microbiology/chapter/nitrogen-fixation https://collegedunia.com/exams/nitrogen-fixation-definition-types-and-process-biology-articleid-1861

6. THANKS TO The Chairman The Secretary Management Committee The Principal of Sri Paramakalyani College The Head - Department of Microbiology The Staff Members - Department of Microbiology