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The Influence of Moisture Stress On the Development, Hatch and Survival of Eggs of Meloidogyne Javanica

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For more content, see Nematology.

In non-electrolytes hatch decreased with increase in osmotic potential until it was almost zero at 12.5 atmospheres. In electrolytes the results were less consistent. The optimum osmotic potential in glycerol for larval emergence from the egg sac was 0.2 atmospheres. In 'perlite' of particle size 250-500μ maximum emergence occurred at 0.05 atmospheres corresponding to the point of inflexion of the moisture characteristic of the 'perlite'. Little emergence occurred at suction or osmotic potentials of about 15 atmospheres. In glycerol hatching was almost zero at about 11 atmospheres and embryonic development stopped at about 15 to 20 atmospheres osmotic potential. Hatched and unhatched second stage larvae were more resistant to high osmotic potential than earlier developmental stages, although second stage larvae became inactive sooner. Second stage larvae became quiescent under dry conditions and probably have a physiological mechanism for conserving water. Embryos and first stage larvae resist desiccation by means of the impermeable vitelline membrane. It is suggested that prior to hatching second stage larvae secrete enzymes that dissolve the water resisting vitelline membrane.

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


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