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Embryogenic Studies of Some Xiphinema and Longidorus Species 1 )

Embryogenic Studies of Some Xiphinema and Longidorus Species 1 ) EMBRYOGENIC STUDIES OF SOME XIPHINEMA AND LONGIDORUS SPECIES 1 ) BY J. J. M. FLEGG 2) East Malling Research Station, Maidstone, Kent, England Similar embryogenic patterns are shown by Xiphinema diversicaudatum, X. vuitlenezi, Xiphinema sp., Longidorus profundorum and L. macrosoma, 19-30 days elapsing between laying and hatching. This period, although apparently longer than previously recorded for phytoparasitic nematodes, is commensurate with the 3-year or more life span of these species. Development starts shortly after laying and the 8-cell stage is reached after about 15% of the total development time has elapsed. Thereafter divisions are more rapid, with gastrulation complete and the larva vermiform after about half of the total development time. The spear-forming cell lays down both functional and replace- ment odontostyls in 6-8 days. The vermiform larva moves actively during elongation, which is followed by a 24-48 hour quiescent period. Shortly before hatching, activity is resumed, accompanied by increasing flexibility of the egg membranes, which ultimately rupture under pressure from the whole head. In southeastern England eggs are produced by three species of Xiphinema and two of Longidorus during only one short period each year (Flegg, 1966, 1967), whilst the first larval stages, although more numerous after http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Embryogenic Studies of Some Xiphinema and Longidorus Species 1 )

Flegg, J.J.M.
Nematologica , Volume 14 (1): 9 – Jan 1, 1968
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529268X00732
Publisher site
See Article on Publisher Site

Abstract

EMBRYOGENIC STUDIES OF SOME XIPHINEMA AND LONGIDORUS SPECIES 1 ) BY J. J. M. FLEGG 2) East Malling Research Station, Maidstone, Kent, England Similar embryogenic patterns are shown by Xiphinema diversicaudatum, X. vuitlenezi, Xiphinema sp., Longidorus profundorum and L. macrosoma, 19-30 days elapsing between laying and hatching. This period, although apparently longer than previously recorded for phytoparasitic nematodes, is commensurate with the 3-year or more life span of these species. Development starts shortly after laying and the 8-cell stage is reached after about 15% of the total development time has elapsed. Thereafter divisions are more rapid, with gastrulation complete and the larva vermiform after about half of the total development time. The spear-forming cell lays down both functional and replace- ment odontostyls in 6-8 days. The vermiform larva moves actively during elongation, which is followed by a 24-48 hour quiescent period. Shortly before hatching, activity is resumed, accompanied by increasing flexibility of the egg membranes, which ultimately rupture under pressure from the whole head. In southeastern England eggs are produced by three species of Xiphinema and two of Longidorus during only one short period each year (Flegg, 1966, 1967), whilst the first larval stages, although more numerous after

Journal

Nematologica – Brill

Published: Jan 1, 1968

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