Level of Endogenous Cytokinins and Auxin in Roots of Nematode Resistant and Susceptible Peach Rootstocks1

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Abstract
Cytokinin and auxin levels were examined in the roots of peach cultivars, resistant (‘Nemaguard’ and ‘Okinawa’) and susceptible (‘Baladi’ and ‘L 198-12’) to the root knot nematode Meloidogyne javanica. This approach was taken in the light of our earlier finding that this nematode developed and completed its life cycle in seedlings of a resistant cultivar when they were wick-fed with kinetin and 1-naphthylacetic acid (NAA). The cytokinin activity in roots of resistant rootstocks was significantly lower when compared with susceptible rootstocks. Wick-feeding with kinetin and NAA increased cytokinin-like activity in the roots of a resistant rootstock. Significant differences were found in the activity of several basic-ether soluble auxin-like growth promoters.

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