Título:	The Neotropical tree Ilex paraguariensis A. St. Hil. (Aquifoliaceae): pollen and seed dispersal in a fragmented landscape.
Autoria:	SEOANE, C. E. S. DIAZ, V. KAGEYAMA, P. MORENO, M. TAMBARUSSI, E. AGUIAR, A. V. de SEBBENN, A.
Afiliação:	CARLOS EDUARDO SICOLI SEOANE, CNPF; VINICIUS DIAZ, UNIVERSIDADE DE SÃO PAULO; PAULO KAGEYAMA, UNIVERSIDADE DE SÃO PAULO; MARIA MORENO, UNIVERSIDADE DE SÃO PAULO; EVANDRO TAMBARUSSI, UNIVERSIDADE ESTADUAL DO CENTRO-OESTE; ANANDA VIRGINIA DE AGUIAR, CNPF; ALEXANDRE SEBBENN, INSTITUTO FLORESTAL DE SÃO PAULO.
Ano de publicação:	2019
Referência:	Annals of Forest Research, v. 62, n. 2, p. 157-171, 2019.
Conteúdo:	Ilex paraguariensis is a dioecious, Neotropical tree endemic to South America with wide cultural, economic and ecological significance. However, due to extensive fragmentation and deforestation throughout its natural area of occur rence, studies on gene flow and genetic diversity are needed to drive genetic conser vation and improvement strategies. Based on the sampling of all adult and juvenile trees in two I. paraguariensis populations, we investigate the realized pollen and seed flow and dispersal distance, spatial genetic structure (SGS) and genetic diver sity using microsatellite markers. We found limited genetic differentiation between populations (G’st = 0.033), but significant differences in terms of genetic diversity (R: 4.7 vs 3.9, H0 : 0.495 vs 0.371, He : 0.445 vs 0.375), pollen (10 vs. 23.3%) and seed immigration (0 vs. 3.3%), mating among relatives (tr : 16 vs 30%) and biparen tal inbreeding (Fr : 0.253 vs. 0.345). Within populations, the genetic diversity was similar between adults and juveniles, but adults presented significantly lower fixa tion index than juveniles, suggesting selection against inbred individuals between juvenile and adult life stages. We also found similar mean pollen (255 vs. 293 m) and seed (385 vs. 323 m) dispersal distances within populations. Our results show that the studied populations are not genetically isolated and some mating occurs among related trees due to SGS; however, the frequency of biparental inbred in dividuals decrease over the life course due to inbreeding depression. These results contribute directly to species management and seed collection and inform in situ and ex situ conservation programs.
Thesagro:	Ilex Paraguariensis Conservação Genética Vegetal
NAL Thesaurus:	Gene flow Yerba mate Conservation plants Population genetics
Palavras-chave:	Erva mate Microsatellite marker Floresta Ombrófila Mista Fluxo gênico Marcador microssatélite
ISSN:	2065-2445
Digital Object Identifier:	10.15287/afr.2019.1427
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPF)