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Maternal and carryover effects on early growth of Eucalyptus globulus

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Abstract:

Maternal and nonmaternal reciprocal effects were compared with nuclear genetic and carryover effects using a diallel mating amongst eight Eucalyptus globulus Labill. wild parents from northeastern and southern Tasmania races. Seed mass exhibited a significant maternal effect, increasing seed germinative capacity but not germination rate. After accounting for variation in seed mass, both germinative capacity and germination rate exhibited significant reciprocal effects, but these were non maternal in origin. Rapid germination and large seeds resulted in significantly larger seedlings in the nursery, but these carryover effects diminished with age. In contrast, the expression of genetic effects increased with age. Significant additive genetic variation was detected for growth by age 3 years and significant reciprocal differences were detected at the race level after 2 years in field trials. If common, such reciprocal effects could bias genetic parameters and impact on the choice of cross-direction in deployment programs. Failure to account for carryover effects in genetic analyses may inflate estimates of genetic variation for growth during early stages of the life cycle.

Les auteurs ont comparé les effets réciproques maternels et non maternels aux effets génétiques nucléaires et de transfert à l'aide d'un plan de croisement diallèle impliquant huit parents à l'état sauvage d'Eucalyptus globulus Labill. représentatifs des races du Nord-Est et du Sud de la Tasmanie. La masse des graines a démontré un effet maternel significatif, augmentant la capacité germinative mais pas le taux de germination. Après avoir tenu compte de l'effet de la masse des graines, la capacité germinative ainsi que le taux de germination ont démontré des effets réciproques significatifs sans être d'origine maternelle. Un taux de germination rapide et de grosses graines donnaient des semis significativement plus gros en pépinière, mais ces effets de transfert diminuaient avec l'âge. Au contraire, l'expression des effets génétiques augmentait avec l'âge. Une variation génétique d'origine additive significative a été détectée pour la croissance à l'âge de 3 ans et des différences réciproques significatives ont été détectées au niveau des races dans les dispositifs au champ après 2 ans. Si ces effets réciproques sont courants, ils pourraient biaiser les paramètres génétiques et influencer le choix du sens des croisements lors de la réalisation des programmes de déploiement. La négligence des effets de transfert lors des analyses génétiques peut entraîner des estimations trop élevées de la variation génétique pour la croissance durant les stades juvéniles du cycle de vie.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2003

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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