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Some Observations On Exudates From Meloidogyne Larvae

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For more content, see Nematology.

Under sterile conditions Meloidogyne larvae exude a dialysable, ether soluble substance which inhibits the growth of Avena coleoptiles. Neither auxins, kinins nor gibberellins were detected in the exudates within the ranges of sensitivity of their bio-assays. The enzymes amylase, pepsin and cellulase were not detected in sterile larval exudates and no protein-staining bands were seen after disc electrophoresis. No evidence was obtained for the exudation of IAA oxidase by M. hapla larvae. On the basis of these results the hypothesis that the free living larval stage does not exude either enzymes or plant growth regulators in any quantity until it receives stimuli from the plant is put forward for further testing.

Affiliations: 1: Horticultural Research Section, C.S.I.R.O., Glen Osmond, South Australia


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