EFFECT OF OSMOTIC CONCENTRATION ON HATCHING OF SOME PLANT PARASITIC NEMATODES BY VICTOR H. DROPKIN, GEORGE C. MARTIN, AND ROBERT W. JOHNSON1) Nematode Research Laboratory, 3985 Union Ave., Seaford, New York, U.S.A. The ability of plant parasitic nematodes to survive in soil between successive host plant generations is well known, for example, in Hetero- dera and Ditylenchus. However, we know little about the physiological mechanisms that operate in these and other genera in response to en- vironmental stresses. The present study shows that the response of certain nematode eggs to an environmental factor, moisture stress, enables the organisms to survive long periods of drought in the soil. Our work began with an observation (by G.C.M.) that larvae of Meloidogyne javanica (Treub, 1885) Chitwood, 1949 failed to emerge from eggs kept in dilute fertilizer solutions. This led to a determination of the exact concentration of NaCI necessary to prevent hatching of root-knot nematodes (Meloidogyite sp. ) and to an examination of the effect of other salts and of dextrose. A detailed study of hatching cur- ves and recovery from inhibition was also made on eggs of Heterodera rostochiensis Wollenweber, 1923 in graded concentrations of NaCI and Ca ( NO3
Nematologica – Brill
Published: Jan 1, 1958
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