EFFECT OF ROOT INFECTION BY PHYTOPHTHORA CINNAMOMI ON NUTRIENT UPTAKE AND TRANSLOCATION BY AVOCADO SEEDLINGS

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Abstract
Infection of avocado [Persea americana] seedling roots by P. cinnamomi greatly increased the root decay, decreased the dry weight of roots by 86%, stems by 89%, and leaves by 82% as compared with the values obtained from the uninfected plants. Presence of the fungus in the roots of avocado seedlings caused drastic changes in nutrient concentrations found in the roots, stems and leaves. The fungus in the roots influenced nutrient uptake from the soil and the distribution of nutrients within the plant parts. Regardless of the concentrations of various nutrients found in the plant tissues, the total amounts of each nutrient/plant under consideration were significantly less in infected than in noninfected plants.

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