AMELIORATION DES PLANTES 394 FITOMEJORAMIENTO PLANT BREEDING 393 ARROZ 374 RIZ 374 RICE 373 VARIEDADES 105 VARIETE 105 VARIETIES 105 PLANT PRODUCTION 103 PRODUCCION VEGETAL 103 PRODUCTION VEGETALE 103 ORYZA 70 INVESTIGACION 63 RECHERCHE 63 RESEARCH 63 RESISTANCE AUX FACTEURS NUISIBLES 54 RESISTANCE TO INJURIOUS FACTORS 54 RESISTENCIA A AGENTES DANINOS 54 RENDEMENT 51 RENDIMIENTO 51 YIELDS 51 BREEDING METHODS 49 METHODE D'AMELIORATION GENETIQUE 48 METODOS DE MEJORAMIENTO GENETICO 48 HIBRIDACION 45 HYBRIDATION 45 HYBRIDIZATION 45 FAO IAEA 44 INDUCED MUTATION 42