Banca de DEFESA: RICHELIEL ALBERT RODRIGUES SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RICHELIEL ALBERT RODRIGUES SILVA
DATA : 16/02/2017
HORA: 08:30
LOCAL: Auditório da Direção da EAJ
TÍTULO:

REPRODUCTIVE ECOLOGY, GENETIC DIVERSITY AND MATING SYSTEM OF Copernicia prunifera (ARECACEAE)

PALAVRAS-CHAVES:

Carnaúba, Reproductive phenology, Reproductive structures, ISSR, Outcrossing rate

PÁGINAS: 53
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Silvicultura
ESPECIALIDADE: Genética e Melhoramento Florestal
RESUMO:

The present study aimed to describe the reproductive characteristics of the palm Copernicia prunifera, investigating the genetic diversity and the system of reproduction of a natural population by using ISSR markers in the state of Rio Grande do Norte, Brazil. In relation to the characterization of reproductive structures, pollen viability and reproductive phenology of Copernicia prunifera, observed that the inflorescences are made up of multiple flowers hermaphroditic, with light coloration. In addition, the flowers are composed of 3 sepals, 3 petals, 6 stamens and 3 carpels. The average percentage of viable pollen was 62%. Additionally, there are differences in the reproductive phenophases between populations evaluated, being observed continuous activity in the production of flowers and ripe fruit in the population of Parnamirim, and discontinuous observation in the Macaíba population. The markers used to analyze the genetic diversity and reproductive system of Copernicia prunifera were usually informative and presented high polymorphism. The values of the indices of diversity among the adults and the progenies did not differ statistically (He = 0.319 and I = 0.470; He = 0.337 and I = 0.505), respectively. In the what-if analysis for detection of genetic bottleneck, IAM models (infinite alleles) and SMM (steps of mutations), all subjects presented population reduction, in addition to deficit of heterozygosity (P < 0.0001). Outcrossing rates in population level (n = 247) pointed multilocus outcrossing rate (t_m) of 0.878 and single locus outcrossing rate (t_s) of 0.738, indicating that the Copernicia prunifera is a species of mixed mating system, and preferentially alogamous. The mating among relatives rate (t_m - t_s) has been reduced, indicating low outcrossing between closely related individuals. The fixation index between seed tree (F) was negative (- 0.200), pointed to the absence of inbreeding. The correlation of selfing (r_s) showed high value (0.914). The results found in this study generated information on the reproductive ecology of the specie, but also to adopt management strategies, conservation and genetic improvement of palm Copernicia prunifera.

MEMBROS DA BANCA:
Presidente - 1715697 - FABIO DE ALMEIDA VIEIRA
Interno - 2075596 - CRISTIANE GOUVEA FAJARDO
Externo à Instituição - MURILO MALVEIRA BRANDÃO - UNIMONTES