UNIVERSITE DE BOURGOGNE THÈSE Yongbo LIU - Université de ...
UNIVERSITE DE BOURGOGNE THÈSE Yongbo LIU - Université de ...
UNIVERSITE DE BOURGOGNE THÈSE Yongbo LIU - Université de ...
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ARTICLE 3<br />
SIMULATION O F I NSECT-RESISTANCE I N G ENE FLOW S TUDY<br />
BETWEEN BRASSICA NAPUS AND WILD B. JUNCEA<br />
Y.B. <strong>LIU</strong>, H. DARMENCY, W. WEI<br />
XIII ème COLLOQUE INTERNATIONAL S UR LA BIOLOGIE D ES MAUVAISES<br />
HERBES, DIJON. Association Française pour la Protection <strong>de</strong>s Plantes, 144-153<br />
SUMMARY:<br />
Gene flow from transgenic crops could introduce novel traits into wild relatives, but the fate<br />
of t ransgenic h ybrids i s unknow n w ithin w ild popul ations. W e s tudy here how a n i nsectresistance<br />
gene es caped f rom Brassica napus into B. j uncea may a ffect p lant f itness,<br />
competition and population dynamics of the wild relative. Insect herbivory was simulated by<br />
four d ifferent l eaf-clipping t reatments, w hile di fferent r atios of c lipped ve rsus non -clipped<br />
plants provi<strong>de</strong>d different competition intensities. With increased proportions of clipped leaves,<br />
the in tensity o f s imulated he rbivory amplified t he f itness a dvantage of the i nsect-resistant<br />
population. Competition magnified the fitness advantage of the insect-resistant plant, but as<br />
their frequency increases, neighbor competition limits their growth.<br />
Key words: insect-resistance, plant fitness, genetically modified crops, competition<br />
RÉSUMÉ :<br />
SIMULATION <strong>DE</strong> LA RESISTANCE AUX INSECTES DANS UNE ETU<strong>DE</strong> <strong>DE</strong> FLUX<br />
<strong>DE</strong> GENES ENTRE BRASSICA NAPUS ET B. JUNCEA SAUVAGE<br />
Le flux inéluctable <strong>de</strong> gènes <strong>de</strong>s cultures transgéniques peut drainer <strong>de</strong> nouveaux traits chez<br />
les pl antes s auvages, m ais l e <strong>de</strong> venir d es h ybri<strong>de</strong>s t ransgéniques a u s ein <strong>de</strong> s popul ations<br />
sauvages r este à p réciser. N ous ét udions i ci co mment u n g ène d e r ésistance au x i nsectes<br />
transmis d e Brassica na pus à un B. j uncea sauvage p eut m odifier l a v aleur adaptative, l a<br />
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