WAVE FORMATION BY INFECTIVE LARVAE OF THE PLANT PARASITIC NEMATODE MELOIDOGYNE JAVANICA BY H. R. WALLACE Division of Horticultural Research, C.S.I.R.O., Glen Osmond, 5064, South Australia Measurements of the wave characteristics of M. javanica on different concentrations of agar suggest that the nematode increases its muscular effort to overcome increased resistance to locomotion while conserving its energy reserves for infectivity and maintaining an efficient means of orienting to exudates released by the host plant root. When a larva of M, javanicd hatches it is endowed with food reserves that are depleted as the nematode migrates through the soil. As the larva does not appear to feed during its freeliving period in the soil it has the dual problem of actively migrating to the host and at the same time conserving its energy reserves in an environment which is constantly changing from conditions that permit rapid locomotion to those that inhibit any movement at all. Several adaptations have been described that increase the nematode's chances of reaching and infesting the root of the host plant. This paper attempts to show how the nematode, by changing its wave form during its characteristic undulatory locomotion, is able to overcome resistance to
Nematologica – Brill
Published: Jan 1, 1969
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