Estimating genetic diversity, mating system and pollen dispersal to inform ex situ conservation of the tree Genipa americana L.

Autor(es)

de Vasconcelos Melo, Marilia Freitas ^[1] ; Sebbenn, Alexandre Magno ^[2] ; Rossini, Bruno Cesar ^[3] ; Cruz da Silva Muniz, Ana Veruska ^[4] ; Rodrigues, Carlos Jose ^[5] ; Marino, Celso Luis ^[3] ; Teixeira de Moraes, Mario Luiz ^[6]

Afiliação do(s) autor(es)

^[1] Univ Fed Alagoas, Campus Engn & Ciencias Agr, BR-57100000 Rio Largo, Alagoas - Brazil

^[2] Inst Florestal Sao Paulo, CP 1322, BR-01059970 Sao Paulo, SP - Brazil

^[3] Univ Estadual Paulista, Inst Biotecnol, UNESP, BR-18607440 Botucatu, SP - Brazil

^[4] Embrapa Tabuleiros Costeiros, BR-49025040 Aracaju, SE - Brazil

^[5] Cia Energet Sao Paulo, Usina Porto Primavera, BR-19274000 Primavera, SP - Brazil

^[6] Univ Estadual Paulista, UNESP, Fac Engn, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT GENETIC RESOURCES-CHARACTERIZATION AND UTILIZATION; v. 19, n. 1, p. 9-19, FEB 2021.
• Citações Web of Science: 0

Resumo

Using microsatellite loci, we assessed the mating system and genetic diversity of the dioecious tropical tree Genipa americana in a natural population (NP) and a progeny test (PT). For NP, we also estimated the paternity correlation within and among fruits and mean pollen dispersal distance. As expected for dioecious species, all offspring originated from outcrossing (t = 1). Mating among relatives (1 - t(s)) and paternity correlation (r(p)) were variable among progenies (1 - t(s) = 0.03-0.19; r(p) = 0.04-0.40), but greater in NP than in PT. Fixation index (F) was generally significant and lower in adults than in offspring, indicating selection against inbred individuals. Paternity correlation was higher within (0.40) than among (0.26) fruits, indicating a lower effective number of pollen donors (N-ep) within (2.5) than among (3.8) fruits. Due to the higher r(p) in NP, the effective size within progenies (N-e) was lower (2.69) than PT (3.27). The pollen dispersal pattern was strongly leptokurtic, suggesting long-distance pollen dispersal (mean of 179 m). The results show that both populations can be used for seed collection in environmental reforestation programmes; however, considering that PT is structured in maternal progenies, NP is more suitable for seed collection due to the lower probability of mating among related trees. (AU)

• Processo FAPESP: 13/19444-6 - Diversidade genética, estrutura genética espacial, sistema de reprodução e fluxo gênico em jenipapo (Genipa americana L.) utilizando marcadores microssatélites
• Beneficiário: Marília Freitas de Vasconcelos Melo
• Modalidade de apoio: Bolsas no Brasil - Doutorado