Neoaplectana carpocapsae: Nematode accumulations on chemical and bacterial gradients
1981; Elsevier BV; Volume: 51; Issue: 1 Linguagem: Inglês
10.1016/0014-4894(81)90037-0
ISSN1090-2449
Autores Tópico(s)Helminth infection and control
ResumoThat infective juveniles of the nematode Neoaplectana carpocapsae accumulated specifically around certain host insect larvae was previously reported by us. In this work, the nematode's behavior was tested on defined chemical and bacterial gradients to determine whether these stimuli could cause the phenomenon. Nematode accumulations occurred around the peaks of certain gradients and, with NaCl, the initial accumulation rate was directly proportional to concentration up to 15 mM. Since the nematode did not respond to K-acetate, K and acetate salts were used to analyze responses to different ions. Maximal accumulations were observed with 60 mM Na+, 6 mM Mg2+, 0.75–7.5 mM Ca2+, and 6 mM CO32−. Accumulations to concentrations of Cl−, basic pH, and gram-negative bacteria were also observed. Acidic pH, 2.5, and 7.5 mM NH4+, repelled nematodes.
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