Which of the following gene clusters in bacteria is responsible for nitrogen fixtion? |
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a) |
Nod, nif, fix |
b) |
Nod, ndf, nfx |
c) |
Nod, nix, nfx |
d) |
Ndx, nif, fix |
Which of the following gene clusters in bacteria is responsible for nitrogen fixtion? |
|||||||
a) |
Nod, nif, fix |
b) |
Nod, ndf, nfx |
c) |
Nod, nix, nfx |
d) |
Ndx, nif, fix |
(a) Genes that direct the steps in nodulation of a legume by a specific rhizobial strain are called nod genes. Many nod genes from different rhizobia are highly conserved and are contained on large plasmids, which given then host specificity. In symplasmid of Rhizobium leguminosarum var. viciae, nod genes for nitrogen fixation, the nif genes. Number of nod genes are present in different species leading to nod factors, which induce root hair curling cell division, nodule formation. |