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Spermatogenesis and sperm structure in some meloidogyne spp heteroderoidea meloidogynidae and a comparison with those in some cyst nematodes heteroderoidea heteroderidae


, : Spermatogenesis and sperm structure in some meloidogyne spp heteroderoidea meloidogynidae and a comparison with those in some cyst nematodes heteroderoidea heteroderidae. Revue de Nematologie 6(1): 17-32

Sperm structure and development was examined in the mitotic (obligatory) parthenogens M. incognita incognita, M. incognita wartellei and M. arenaria, in the meiotic (facultative) parthenogens M. hapla (race A) and M. graminicola, in M. oryzae (reproductive status unknown) and in the amphimictic species M. acronea. Spermatogenesis in Meloidogyne differs from that in the cyst nematodes, in which the maturation divisions occur only in the testis of the pre-adult; cells in all phases of spermatogenesis were present in adult Meloidogyne males. The structure of the spermatid in M. hapla is discussed. In Meloidogyne, differences in sperm structure between species concerned mainly: the polarization of the spermatozoa in some into a main body and a pseudopodium; persistence or otherwise of the fibrillar bodies; abundance of filopodia, particularly at earlier stages; state of the nuclear material and size of mature sperm. Sperm of 4 Meloidogyne spp. were, like cyst-nematode testicular sperm, unpolarized. The form of the condensed chromatin in the sperm nucleus was similar in most Meloidogyne to that in Heterodera. In Globodera and in M. oryzae the form was different. So-called nucleolar bodies, present in the Meloidogyne spp., were absent from sperm in the testis of cyst nematodes. Cortical microtubules lining the plasma membrane of the sperm and the absence of membranous organelles, were constant features throughout the 2 families.

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