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TABLE 14.9 Examples of Modifications of the Rhizobial Core Nod Factors and the Genes and Their Products Involveda

Bacterium

Core substituents

Genes

S. meliloti

R4:Ac, R5:S, C16:2

R4:nodL, R5:nodH, fatty acid:nodAFEG

M. loti

R1:Me, R3:Cb, R5:AcFuc

R1:nodS, R3:nolO, R5:nodZ and nolL

B. japonicum

R5:MeFuc

R5:nodZ and noel

A. caulinodans

R1:Me, R4:Cb, R5:Fuc, R8:Ara

R1:nodS, R4:nodU, R5:nodZ, R8:noeC

aThese examples do not represent nod factors produced by all species of a named genus nor all strains of the same species.

aThese examples do not represent nod factors produced by all species of a named genus nor all strains of the same species.

and isoflavones, which are phenolic compounds collectively referred to as fla-vanoids. The flavanoids bind to the nodD gene product, which acts as a transcrip-tional activator of the other nod genes.

Different types of flavanoid molecules are involved in nod gene induction in different legume species, for example, luteolin in M. sativa (alfalfa) and genistein in Gly. max (soybean).

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