Production of a pectinase precedes infection. Acidity in the pH-range 4.5 to 5.5, which inhibits production of root-nodules by inhibiting the infection of the root-hairs, also inhibits the action of the pectinase on pectin. The enzyme's pH-requirements may determine those of nodulation.
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Munns, D.N. Enzymatic breakdown of pectin and acid-inhibition of the infection of Medicago roots by rhizobium. Plant Soil 30, 117–120 (1969). https://doi.org/10.1007/BF01885269
- Plant Physiology