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Non-random mating in controlled multiple-donor crosses in Gracilaria gracilis (Gracilariaceae, Rhodophyta)

Published online by Cambridge University Press:  16 December 2002

CAROLYN R. ENGEL
Affiliation:
Laboratoire de Génétique et Evolution des Populations Végétales, UPRESA CNRS 8016, GDR 1002, FR 1818, Université de Lille I, Bât. SN2, 59655 Villeneuve d'Ascq Cedex, France Present address: Evolution et Génétique des Populations Marines, UMR 7127 CNRS/UPMC, Station Biologique de Roscoff Place Georges Tessier BP 74 29682 Roscoff Cedex France.
MYRIAM VALERO
Affiliation:
Laboratoire de Génétique et Evolution des Populations Végétales, UPRESA CNRS 8016, GDR 1002, FR 1818, Université de Lille I, Bât. SN2, 59655 Villeneuve d'Ascq Cedex, France Present address: Evolution et Génétique des Populations Marines, UMR 7127 CNRS/UPMC, Station Biologique de Roscoff Place Georges Tessier BP 74 29682 Roscoff Cedex France.
YVAN LAGADEUC
Affiliation:
Ecosystèmes Littoraux et Côtiers UPRESA CNRS 8013, Université de Lille I, Station Marine de Wimereux, 62930 Wimereux, France Present address: Université de Caen, Laboratoire de Biologie et Biotechnologies Marines, IUT, Département Génie Biologique, Boulevard Maréchal Juin, 14032 Caen Cedex, France.
CHRISTOPHE DESTOMBE
Affiliation:
Laboratoire de Génétique et Evolution des Populations Végétales, UPRESA CNRS 8016, GDR 1002, FR 1818, Université de Lille I, Bât. SN2, 59655 Villeneuve d'Ascq Cedex, France Present address: Evolution et Génétique des Populations Marines, UMR 7127 CNRS/UPMC, Station Biologique de Roscoff Place Georges Tessier BP 74 29682 Roscoff Cedex France.
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Abstract

Crosses were performed to identify the sources of variation in zygote production (via cystocarp production) in Gracilaria gracilis, a red haploid-diploid seaweed. First, because male gametes are short-lived (<6 h), the rate of gamete encounters was evaluated in a time-course experiment. Second, the effect of water motion on gamete encounters was assessed by introducing turbulent eddies in the crossing tank and by comparing fertilization rates with and without this added turbulence. Third, variation due to individual performance was explored by performing multiple-donor crosses using 12 males and 12 females from three populations. Paternity of cystocarps produced in these crosses was determined using microsatellite markers. The results show that cystocarp yield increased with exposure time: fertilization occurred in as little as 15 min after the introduction of male branches into the crossing tank and maximum cystocarp production values were observed at 6 h. There were no significant differences in cystocarp production between the two turbulence levels. On the other hand, cystocarp production was highly influenced by male and female parental identities and to a lesser degree by an interaction between the male and female parents. The variation in cystocarp production according to male and female identity was not due to population origin as there was no difference between intra- and inter-population crosses. Thus non-random mating occurs in controlled conditions and arises from differential performance in G. gracilis. There was a strong deviation from equality of male performance, implicating post-adhesion events and/or male gamete production as important in generating non-random mating. Consequently, non-random mating may play a role in the evolution of mating patterns in G. gracilis.

Type
Research Article
Copyright
© 2002 British Phycological Society

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Non-random mating in controlled multiple-donor crosses in Gracilaria gracilis (Gracilariaceae, Rhodophyta)
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Non-random mating in controlled multiple-donor crosses in Gracilaria gracilis (Gracilariaceae, Rhodophyta)
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Non-random mating in controlled multiple-donor crosses in Gracilaria gracilis (Gracilariaceae, Rhodophyta)
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