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Titolo:
SPERM COMPETITION IN MATED 1ST GENERATION HERMAPHRODITE FEMALES OF THE HP-88 STRAIN OF HETERORHABDITIS (NEMATODA, HETERORHABDITIDAE) AND PROGENY SEX-RATIOS IN MATED AND UNMATED FEMALES
Autore:
DIX I; KOLTAI H; GLAZER I; BURNELL AM;
Indirizzi:
ST PATRICKS COLL,DEPT BIOL MAYNOOTH KILDARE IRELAND
Titolo Testata:
Fundamental and applied nematology
fascicolo: 1, volume: 17, anno: 1994,
pagine: 17 - 27
SICI:
1164-5571(1994)17:1<17:SCIM1G>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Keywords:
HETERORHABDITIS; FERTILIZATION; SPERM COMPETITION; SEX RATIO; DUMPY MUTANT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
I. Dix et al., "SPERM COMPETITION IN MATED 1ST GENERATION HERMAPHRODITE FEMALES OF THE HP-88 STRAIN OF HETERORHABDITIS (NEMATODA, HETERORHABDITIDAE) AND PROGENY SEX-RATIOS IN MATED AND UNMATED FEMALES", Fundamental and applied nematology, 17(1), 1994, pp. 17-27

Abstract

We have used a ''dumpy'' mutant to study the process of fertilisationin Heterorhabditis. We have found that in inseminated first generation hermaphrodite females, male sperm has a competitive advantage in fertilisation over the hermaphrodites' own sperm. Light microscope observations show that a spermatheca is absent in first generation hermaphrodite females and that inseminated sperm is stored in the proximal partof the ovotestis where it intermixes with hermaphrodite sperm. Inseminated sperm had well developed pseudopodia and appeared to be more active than hermaphrodite sperm. A spermatheca was observed in second generation amphimictic females and inseminated sperm was stored there andnot in the proximal part of the ovary or in the uterus. The sex ratios of the outcross progeny of both hermaphrodites and amphimictic females ranged from 2.2 to 6.6 males per thousand progeny, a large deviation from the 1:1 ratio which would be expected among the outcross progeny of heterogametic males. A twenty to thirty fold higher proportion ofmale progeny was observed among the progeny of self fertilised hermaphrodites. Thus the source of the sperm, whether from males or hermaphrodites clearly influences progeny sex ratios in the HP 88 strain of Heterorhabditis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 06:12:43