New evidence is described on one way crossing barriers Une nouvelle evidence est dkcrite sur les barribres B sens between Aigeiros and Tacamahaca species, gained in experimental unique lors des croisements entre les es@cesAigeros et Tacamafull-sib crosses. The technique of crosses and embryo rescue are haca, obtenues chez des descendants directs expkrimentaux described. In some crosses of questionable result, the embryo resobtenus par croisement. Les techniques de croisement et de cue was successful. The possible genetic mechanisms underlyricup6ration de I'embryon sont d&tes dans cet expos6 Pour cering the crossing barriers are discussed.tains croisements dont les resultats sont discutables, la rCcupiration de I'embryon a CtC faite avec succbs. Les mCcanismes gCn6-
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