New researches, related to the impact of climate change on the presence and potential distribution of Tithonia, reveal that for all the evaluated scenarios the effect would be beneficial, so there are not affectations for this crop and they can continue to play the role it represents in animal feeding ( Durant et al. Gray stands out for its high ecological and productive plasticity, which contributes to be considered the most accepted protein plant by farmers in Cuba and other regions of the world ( Paniagua-Hernández et al. Key words: Germination, Tithonia diversifolia, pure germinable seed (PGS), establishment, production and gamic reproduction. The advances made allow the promotion of seed production and achieve a greater introduction and generalization of this species, which in turn can contribute to an increase in food production. It is showed for the first time, the advantages of the sowings by gamic seed in relation to the plantations by cuttings and in bags for the forage yield (11.68 vs 9.48 and 9.92 t DM.ha -1) and for the populations (10.55 vs 5.88 and 10.88 plants.m -2) respectively, in the establishment cut. Results are discussed and reported on the real possibility of achieving satisfactory establishments and acceptable biomass production when different practices are used to protect gamic seeds with plant and organic wastes. The integral agronomic management allowed defining the best harvest time and the effects on different practices that allow the appearance of uniform flowering flows and obtaining yields of the order of 20-30 kg of pure germinable seed (PGS). It is shown that germination percentages between 50 and 90 % can be reached when the seeds are harvested at the optimum moment and treatments that favor viability and germination are applied.
The germination of this species is reported, as well as the ways to increase it through dormancy detection, seed conservation, types of substrates and their performance under laboratory and nursery conditions, as well as the variables related to the morphostructure of seedlings until transplantation. This review aims to spread the advances in the production of gamic seed of Tithonia diversifolia Hemsl.) A.
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