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Universidade Estadual Paulista Júlio de Mesquita Filho (2014)

Propagação do pinhão manso por estaquia, enxertia e sementes

Furlani, Renata Capistrano Moreira

Titre : Propagação do pinhão manso por estaquia, enxertia e sementes

Auteur : Furlani, Renata Capistrano Moreira

Université de soutenance : Universidade Estadual Paulista Júlio de Mesquita Filho

Grade : Doctoral thesis 2014

Résumé
Jatropha can be propagated vegetatively by cuttings and grafting or by seeds. It is a allogamous plant, when propagated via seed originates progenies with high genetic variability, later production, but with developed tap root which gives great plant vigor and resistance to prolonged drought. When propagated vegetatively presents the same characteristics as the parental plant, just secondary roots were developed, but with early fruit production. The technique of grafting also gives more precocity to the plants, with the advantage of combining rootstock resistance with the graft yield. The present study aimed to develop techniques for Jatropha propagation by cuttings, grafting and seed systems. Four experiments were conducted, and the first one aimed to test the rooting and vegetative development of plants from different types of cuttings (basal, middle and apical) on two types of substrates (sand and vermiculite). The second evaluated the rooting of cuttings (basal, middle and apical) from branches stored in ambient conditions for 30 and 60 days. The third experiment aimed to evaluate the antioxidant effect of citric acid in cuts before grafting and the use of two systems for setting grafts string and gauze. The last experiment evaluated seed germination and early seedling development of Jatropha as a function of environment and time of seed storage.When propagated by cuttings and using different substrates for rooting, Jatropha basal cuttings provide a higher percentage of living cuttings, as well as cuttings installed in vermiculite also had a higher percentage of survival. At the end of the experiment the basal cuttings were superior to others in all variables analyzed, as well as those in vermiculite. Regarding storage of Jatropha branches for later use, it is concluded that the storage of Jatropha branches up to 30 days is feasible under the conditions studied andthe basal part of the cuttings

Mots clés  : Plantas - Propagação - Pinhão-manso - Propagação por estaquia - Enxertia - Sementes - Plant propagation

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