01315naa a2200181 a 450000100080000000500110000800800410001902400600006010000160012024500790013626000090021550000990022452007220032365000130104565000140105870000160107277300450108821672312024-09-06       1952    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1111/j.1558-5646.1952.tb01437.x2DOI1 aADDISON, G.  aHybridization and grafting in species of Theobroma.h[electronic resource]  c1952  aDisponível em: https://doi.org/https://doi.org/10.1111/j.1558-5646.1952.tb01437.x. Acesso em:  aExperiments have been made intercrossing the nine species of Theobroma which occur in Amazonia. Most cross pollination gives no normally maturing fruits, but some crosses result in production of hybrid seeds. Hybrid seeds germinate in some cases with difficulty, and the seedlings often show a lowered viability. Only some adult hybrids have been obtained, but these have proved at least partly fertile. Buds of some species when grafted onto others fail to develop, while in other combinations of species the scions grow normally. The degrees of success of interspecific hybridization and of grafting show a strong positive correlation. A classification of the nine species based on the experimental data is proposed  aAmazonia  aTheobroma1 aTAVARES, R.  tEvolutiongv. 6, n. 4, p. 380-386, 1952.