Depicting the mating system and patterns of contemporary pollen flow in trees of the genus Anadenanthera (Fabaceae)

Author(s)

Feres, Juliana Massimino ^[1] ; Nazareno, Alison G. ^[2] ; Borges, Leonardo M. ^[3] ; Guidugli, Marcela Corbo ^[1] ; Bonifacio-Anacleto, Fernando ^[1] ; Alzate-Marin, Ana Lilia ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Genet, Programa Posgrad Genet, Ribeirao Preto, SP - Brazil

^[2] Univ Fed Minas Gerais, Dept Genet Ecol & Evolucao, Belo Horizonte, MG - Brazil

^[3] Univ Fed Sao Carlos, Dept Bot, Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: PeerJ; v. 9, APR 7 2021.
• Web of Science Citations: 0

Abstract

Anadenanthera (Fabaceae) is endemic to the Neotropics and consists of two tree species: A. colubrina (Vell.) Brenan and A. peregrina (L.) Speg. This study examined the mating system and contemporary gene flow of A. colubrina (Acol) and A. peregrina (Aper) in a highly fragmented area of the Atlantic Forest to provide valuable information that informs conservation strategies. Reproductive adults from forest remnants {[}n(A. colubrina) = 30 (2.7 ha), n(A. peregrina) = 55 (4.0 ha)] and progeny-arrays (n(A. colubrina) = 322, n(A. peregrina) = 300) were genotyped for seven nuclear microsatellite markers. Mating system analyses revealed that A. colubrina is a mixed mating species (t(m) = 0.619) while A. peregrina is a predominantly outcrossing species (t(m) = 0.905). For both Anadenanthera species, high indices of biparental inbreeding were observed (Acol = 0.159, Aper = 0.216), resulting in low effective pollination neighborhood sizes. Categorical paternity analysis revealed different scales of pollen dispersal distance: the majority of crossings occurring locally (i.e., between nearby trees within the same population), with moderate pollen dispersal coming from outside the forest fragments boundaries (Acol(mp) = 30%, Aper(mp) = 35%). Nevertheless, pollen immigration from trees outside the populations for both species suggests that the populations are not reproductively isolated. This study highlights the importance of evaluating both mating system and contemporary gene flow for a better understanding of the biology of Anadenanthera species. This information should be considered to ensure the effective conservation and management practices of these plant species. (AU)

• FAPESP's process: 09/14200-6 - Genetic diversity, gene flow and mating system of Anadenathera colubrina (vell.) Brenan and Anadenanthera peregrina (L.) Speg: two species that occur in high densities in small populations in São Paulo State
• Grantee: Juliana Massimino Feres
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 11/08883-3 - Mating patterns and gene flow in two reproductive events of two forest species that occur in natural remaining of Ribeirão Preto (SP) region
• Grantee: Ana Lilia Alzate Marin
• Support Opportunities: Regular Research Grants