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| Author(s): |
Vanessa Zaffani Sant'ana
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Ilha Solteira. 2017-10-11. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Ilha Solteira |
| Defense date: | 2017-08-14 |
| Advisor: | Mario Luiz Teixeira de Moraes; Ananda Virginia de Aguiar |
| Abstract | |
The aroeira (Myracrodruon urundeuva) is a dioecious species and is on the list of endangered species due to its high economic value and the destruction of its habitat. That way, becomes necessary the adoption of strategies for the ex situ conservation of native tree species, such that the genetic variability of populations is maintained. The objective of this work was to quantify the sex ratio, the survival and the genetic variation of the diameter at breast height (DBH), on six test progenies of Myracrodruon urundeuva from six distinct populations originating three biomes (Caatinga, Cerrado and Atlantic Forest). The design used, in each progeny test, was a randomized block design. Estimates of variance components and genetic parameters, for quantitative traits DBH and survival, were obtained by REML / BLUP method (restricted maximum likelihood / best linear prediction untainted). The effective population size was calculated based on the number of individuals with male and female flowers in the population, in a model that there is no control of gametes (RS). It was verified based on the estimates of the genetic parameters that the Itarumã and Seridó provenances express greater genetic variation for the DBH character, which allows their use in conservation and genetic improvement. High survival percentages were found, which characterizes an optimal adaptation of the species at the planting site. The sex ratio was biased, with predominance of male flowering plants (3♂:1♀), but most of M. urundeuva individuals, from the different biomes, did not flower in Selvíria-MS. The effective population size varied according to the sex ratio, being that the progeny tests that approached more of the real value of reproductive individuals were those originating from Seridó (RN), Itarumã (GO) and Petrolina (PE). The subpopulations of the tests progenies of Itarumã and Selvíria are the closest genetically of the reference population (T), that is, they have the same genetic representativeness. Therefore, the selection of individuals within the progeny tests should not only consider the growth trait (DBH), but also be based on sex ratio and effective population size for its future transformation into a Seed Orchard. (AU) | |
| FAPESP's process: | 15/15693-7 - Sex ratio in populations of Myracrodruon urundeuva for training purposes of seed orchards per seedlings |
| Grantee: | Vanessa Zaffani Sant´Ana |
| Support Opportunities: | Scholarships in Brazil - Master |