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Sex Differentiation of Aphelenchus Avenae in Axenic Culture

Sex Differentiation of Aphelenchus Avenae in Axenic Culture SEX DIFFERENTIATION OF APHELENCHUS AVENAE IN AXENIC CULTURE BY EDER L. HANSEN, EDWARD J. BUECHER, and EVANGELINE A. YARWOOD Clinical Pharmacology Research Institute 2030 Haste Street., Berkeley, California 94704 U.S.A. In axenic cultures of a parthenogenetic strain of Aphelenchus avenae males developed at 30° C and at 28° under 5-20% CO2. The sex conversion was studied in individuals in hanging drops and test tube cultures, with environmental conditions changed during development of the egg or early hatched larvae. Maleness was not associated with retardation of rate of development. No intersexes were seen. Other workers have shown that environmental factors will affect sex differen- tiation of certain plant parasitic nematodes (Triantaphyllou & Hirschmann, 1964). Such studies, however, of necessity have also involvel environmental effects on the host plant. In axenic cultures of Aphelenchus avenae we noted that at high temperatures (30-32°) males appeared in the first filial generation of this usually parthenogenetic species (Hansen, Buecher, & Evans, 1970). Furthermore, in high temperature cultures inoculated with eggs that had been deposited at lower tempe- ratures, both males and females developed. Therefore, we investigated the extent to which the sex of A. avenae was affected by temperature. We also studied the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Sex Differentiation of Aphelenchus Avenae in Axenic Culture

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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529272X00485
Publisher site
See Article on Publisher Site

Abstract

SEX DIFFERENTIATION OF APHELENCHUS AVENAE IN AXENIC CULTURE BY EDER L. HANSEN, EDWARD J. BUECHER, and EVANGELINE A. YARWOOD Clinical Pharmacology Research Institute 2030 Haste Street., Berkeley, California 94704 U.S.A. In axenic cultures of a parthenogenetic strain of Aphelenchus avenae males developed at 30° C and at 28° under 5-20% CO2. The sex conversion was studied in individuals in hanging drops and test tube cultures, with environmental conditions changed during development of the egg or early hatched larvae. Maleness was not associated with retardation of rate of development. No intersexes were seen. Other workers have shown that environmental factors will affect sex differen- tiation of certain plant parasitic nematodes (Triantaphyllou & Hirschmann, 1964). Such studies, however, of necessity have also involvel environmental effects on the host plant. In axenic cultures of Aphelenchus avenae we noted that at high temperatures (30-32°) males appeared in the first filial generation of this usually parthenogenetic species (Hansen, Buecher, & Evans, 1970). Furthermore, in high temperature cultures inoculated with eggs that had been deposited at lower tempe- ratures, both males and females developed. Therefore, we investigated the extent to which the sex of A. avenae was affected by temperature. We also studied the

Journal

Nematologica – Brill

Published: Jan 1, 1972

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