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The Role of Trehalose in the Hatching Mechanism of Heterodera Goettingiana

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For more content, see Nematology.

Carbohydrate analysis of cyst components of Heterodera goettingiana revealed trehalose in the egg, mainly in the fluid surrounding the unhatched juvenile, at a concentration of 0.5 M. When hatched juveniles were transferred from artificial tap water or distilled water to 0.5 M trehalose their water content fell to 66.5 % , the value observed for unhatched juveniles in eggs equilibrated with water. Few juveniles moved after 7 d immersion in 0.5 M trehalose, but dilution with water to give a sugar concentration 0.1 M resulted in over 90% of the juveniles moving after 24 hr. Hatching was also inhibited when cysts were immersed in solutions of pea root diffusate containing trehalose to give a concentration of 0.5 M. This evidence, together with the increase in juvenile water content which occurs before hatching when eggs are immersed in pea root diffusate, suggests that loss of solutes from the egg fluid permits hatching. H. goettingiana shares some features of a hatching mechanism previously described for Globodera rostochiensis and Ascaris suum.

Affiliations: 1: Nematology Dept., Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ, England


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