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Some effects of suction on the hatching eggs of Meloidogyne javanica
Author(s) -
BAXTER R. I.,
BLAKE C. D.
Publication year - 1969
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1969.tb05480.x
Subject(s) - hatching , biology , suction , meloidogyne javanica , yolk , dehydration , osmotic pressure , hydraulic conductivity , horticulture , botany , zoology , soil water , ecology , biochemistry , nematode , mechanical engineering , engineering
SUMMARY Development and hatch of eggs of Meloidogyne javanica was independent of suction between pF o and 3·6 but decreased rapidly between pF 3·6 and 4·2. Water was lost from the extracellular fluid of eggs containing developing embryos when the suction was above pF 3·6, causing a decrease in the mean volume of the eggs. The vitelline membrane of an egg is probably semipermeable and the osmotic pressure of the contents about 4 atmospheres ( pF 3·6). The volume of the cellular contents of an egg did not increase during development and so the hydraulic conductivity of the soil is probably unimportant in hatching. The results suggest that eggs of M. javanica hatch over a wide range of soil moistures. The inhibition of hatch at high suctions, involving the reversible removal of water, is a likely survival mechanism.