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The Influence of Plant-Growth Substances and Their Inhibitors On the Host-Parasite Relationships of Aphelenchoides Ritzemabosi in Culture

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For more content, see Nematology.

The multiplication of Aphelenchoides ritzemabosi on lucerne seedlings grown aseptically on nutrient agar medium without 2,4-dichlorophenoxyacetic acid was significantly increased by kinetin, gibberellic acid, indole-3-acetic acid (IAA) and by the IAA precursor tryptophane. The double treatments, gibberellic acid/IAA and gibberellic acid/tryptophane increased multiplication significantly more than gibberellic acid alone. (2-Chloroethyl) trimethylammonium chloride (a gibberellic acid antagonist), 7, azo-indole (IAA inhibitor) and 2-hydroxy-5-nitro-benzyl bromide (tryptophane inhibitor) decreased multiplication, significantly so in the presence of gibberellic acid. The nematodes multiplied fastest when plant growth or cell activity was greatest. It is suggested that the nematodes secrete proteolytic enzymes that release from the plant tissues amino acids such as tryptophane (precursor of IAA) and substances such as gibberellic acid, that stimulate cell activity and growth and provide a favourable nutritional environment for nematode multiplication.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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