Propagation of parInari curatellifolia planch. ex benth and uapaca kirkiana muell. arg by seeds and stem cuttings

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dc.contributor.authorMwang'ingo,Patrick Paschal Lusinde
dc.date.accessioned2026-05-22T10:36:42Z
dc.date.available2026-05-22T10:36:42Z
dc.date.issued1997
dc.descriptionDissertation
dc.description.abstractTwo experiments on propagation of Parinari curatellifolia and Uapaca kirkiana were carried out at the National Tree Seed Programme (NTSP), Iringa Zonal Tree Seed Centre during December, 1995 - June, 1996 with the aim of determining efficient techniques of enhancing the germination of P. curatellifolia seeds and to see whether P. ciiratellifolia and U. kirkiana could be raised vegetatively through stem cuttings. The7J. curatellifolia seeds were subjected to different pre-sowing treatments involving the physical scarification to the seedcoats, soaking in hot water and concentrated sulphuric acid at various storage periods. For vegetative propagation of both P. curatellifolia and U. kirkiana, the possibility of using either basal or terminal parts of the stem cuttings and influence of different concentrations of lndole-3-Butyric Acid hormone were tested. The results indicated the existence of serious seed dormancy problems which limit the rate of germination in P. curatellifolia seeds. Only pre-sowing seed treatments by complete and partial removal of the seedcoats gave germination at all the storage periods with the former giving better mean cumulative germination of 34%, germination energy of 30%, germination value of 1.4, complete, total and differential dormancy periods of 27.8, 67.6 and 40.6 days respectively. The storage period enhanced early germination in seeds stored for at least 30 days with the combined effect of seed storage for 60 days and pre-sowing treatment by complete removal of the seedcoats giving early germination (21.3 days). The results for the vegetative propagation indicated a potential of raising both species by stem cuttings with the basal parts combined with hormone application of 375 ppm for P. curatellifolia and 125 ppm for U kirkiana. The best establishment performances of sprouting, rooting, root number and root length means of 46.7%, 41.3%, 5.4 and 50.8 mm for/-’, curatellifolia and 62.9%, 53.3%, 5.2 and 58.8 mm for U kirkiana respectively were obtained. It is concluded that, both tree species have a potential of being raised through seeds and stem cuttings. When seeds are preferred in raising P. curatellifolia plants, they need to be pre-treated by completely removing the seedcoats to improve the permeability of the seeds to air and water and in overcoming the mechanical resistance to embryo growth.The storage of seeds for 60 days before sowing allows the maturation of the embryos and thus in enhancing their early germination. Since the germination of 34% obtained in the present study is still low and sporadic, other types of dormancies like chemical and physiological or a combination of the two are also suspected to play a role. While the immediate application of the obtained results is being recommended, further research is required to confinn the identity of the other types of dormancies still associated with the P. curatellifolia seeds in order to resolve them and raise the overall seed gennination and improved efficiency and effectiveness of the vegetative propagation technology by stem cutting.
dc.description.sponsorshipThe African Network for Agroforestry Education/Intemational Centre for Research in Agroforestry (ANAFE/ICRAF)
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/20.500.14820/7596
dc.language.isoen
dc.publisherSokine University of Agriculture
dc.subjectParinanri curatellifolia planch
dc.subjectUapaca kirkiana muell
dc.subjectSeeds
dc.subjectStem cutting
dc.titlePropagation of parInari curatellifolia planch. ex benth and uapaca kirkiana muell. arg by seeds and stem cuttings
dc.typeThesis

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