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A high level of outcrossing in the vulnerable species Prosopis rubriflora in a Chaco remnant

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Autor(es):
Alves, Fabio M. [1, 2] ; Sartori, Angela L. B. [3] ; Zucchi, Maria I. [4] ; Azevedo-Tozzi, Ana M. G. [2] ; Tambarussi, Evandro V. [5] ; de Souza, Anete P. [1, 2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, CBMEG, BR-13083875 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Biol, Dept Plant Biol, POB 6109, BR-13083970 Campinas, SP - Brazil
[3] Fed Univ Mato Grosso Sul UFMS, Ctr Biol & Hlth Sci CCBS, Cidade Univ S-N, POB 549, BR-79070900 Campo Grande, MS - Brazil
[4] Sao Paulo Agcy Technol & Agrobusiness, Polo Apta Ctr Sul, SP 127, Km 30, BR-13400970 Piracicaba, SP - Brazil
[5] State Univ Cent West, Dept Forestry Engn, PR 153, Km 7, BR-84500000 Irati, PR - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Australian Journal of Botany; v. 66, n. 4, p. 360-368, 2018.
Citações Web of Science: 0
Resumo

Prosopis rubriflora Hassl. is a tree species typically found in chaquenian areas, mainly with an arborised phytophysiognomy in the southern region of the Pantanal wetland. This species has become vulnerable in recent decades as a result of considerable increases in anthropogenic activities such as cattle breeding, and this vulnerability has also been observed in several other native species. The goal of this study was to estimate the mating system of P. rubriflora in a Chaco remnant by analysing 10 microsatellite markers. Samples were collected over 2 years (2010-213 seedlings and 2011-180 seedlings), and the results suggest that the mating system of P. rubriflora is preferably allogamous. A progeny array was predominantly composed of half-sibs (from 76 to 79%), full-sibs (from 15%) and self-half-sibs (from 6 to 9%). The outcrossing rate between related individuals was significant in 2011 but not in 2010. The average co-ancestry coefficient ((theta) over bar) ranged from 0.158 to 0.162, and the variance effective size (N-e) ranged from 3.05 to 3.13. The number of seed trees required for seed collection (m) to retain an effective size of 150 in progeny array samples was 48-49. The high levels of outcrossing of P. rubriflora appear to be related to several mechanisms that avoid selfing and due to the behaviour of native pollinators, which clearly contribute to the gene flow of the species. (AU)

Processo FAPESP: 08/52197-4 - Genomic-assisted breeding of sugarcane: using molecular markers for understanding the genetic architecture of quantitative traits and to implement marker assisted selection
Beneficiário:Anete Pereira de Souza
Linha de fomento: Auxílio à Pesquisa - Programa BIOEN - Temático
Processo FAPESP: 10/51242-6 - Leguminosas lenhosas no Chaco brasileiro: uma abordagem florística, fitogeográfica e genética
Beneficiário:Fábio de Matos Alves
Linha de fomento: Bolsas no Brasil - Doutorado