Here we describe the membrane specializations displayed by "dormant" collembolan spermatozoa, during the period when they are temporarily stored in the male genital ducts before being laid in the soil as a spermatophore, which is then picked up by the female. In the male deferent ducts and in the spermatophore, these "dormant" spermatozoa are rolled up into flattened ellipsoids that surround a central extracellular cavity filled with dense material. In this condition, the plasma membranes that surround the central extracellular cavity contain two types of membrane specializations. One consists of parallel rows of intramembrane particles on the E-face of the membrane facing the outside of the spermatozoa. The other consists of small orthogonal plaques of intramembrane particles intermingled with these rows. These plaques associate with the P-face of the membrane, and are therefore likely to represent preferential sites for receiving and transmuting environmental signals, especially whatever signal(s) induce these spermatozoa to transform into filiform and motile cells upon reaching the female spermatheca.

Dallai, R., Fanciulli, P.P., Frati, F., Paccagnini, E., & Lupetti, P. (2003). Membrane specializations in the spermatozoa of collembolan insects. JOURNAL OF STRUCTURAL BIOLOGY, 142, 311-318 [10.1016/S1047-8477(03)00032-7].

Membrane specializations in the spermatozoa of collembolan insects

DALLAI, ROMANO;FANCIULLI, PIETRO PAOLO;FRATI, FRANCESCO;PACCAGNINI, EUGENIO;LUPETTI, PIETRO
2003

Abstract

Here we describe the membrane specializations displayed by "dormant" collembolan spermatozoa, during the period when they are temporarily stored in the male genital ducts before being laid in the soil as a spermatophore, which is then picked up by the female. In the male deferent ducts and in the spermatophore, these "dormant" spermatozoa are rolled up into flattened ellipsoids that surround a central extracellular cavity filled with dense material. In this condition, the plasma membranes that surround the central extracellular cavity contain two types of membrane specializations. One consists of parallel rows of intramembrane particles on the E-face of the membrane facing the outside of the spermatozoa. The other consists of small orthogonal plaques of intramembrane particles intermingled with these rows. These plaques associate with the P-face of the membrane, and are therefore likely to represent preferential sites for receiving and transmuting environmental signals, especially whatever signal(s) induce these spermatozoa to transform into filiform and motile cells upon reaching the female spermatheca.
File in questo prodotto:
File Dimensione Formato  
Dallai et al 2003 Membrane specialization in the spermatozoa of collembolan insects.pdf

non disponibili

Tipologia: Post-print
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 1.22 MB
Formato Adobe PDF
1.22 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/33856
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo