A population genomics appraisal suggests independent dispersals for bitter and sweet manioc in Brazilian Amazonia

Author(s)

Alves-Pereira, Alessandro ^{[1, 2]} ; Clement, Charles R. ^[3] ; Picanco-Rodrigues, Doriane ^[4] ; Veasey, Elizabeth Ann ^[1] ; Dequigiovanni, Gabriel ^[1] ; Ferreyra Ramos, Santiago Linorio ^[1] ; Pinheiro, Jose Baldin ^[1] ; de Souza, Anete Pereira ^[2] ; Zucchi, Maria Imaculada ^[5]

Affiliation

^[1] Univ Sao Paulo, Dept Genet, Escola Super Agr Luiz de Queiroz, Piracicaba - Brazil

^[2] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, UNICAMP, Av Candido Rondon 400, Cidade Univ, CP 6010, BR-13083875 Campinas, SP - Brazil

^[3] INPA, Manaus, Amazonas - Brazil

^[4] Univ Fed Amazonas UFAM, Inst Ciencias Biol, Manaus, Amazonas - Brazil

^[5] APTA, Polo Ctr Sul, Piracicaba - Brazil

• Document type: Journal article
• Source: EVOLUTIONARY APPLICATIONS; v. 13, n. 2 OCT 2019.
• Web of Science Citations: 0

Abstract

Amazonia is a major world centre of plant domestication, but the genetics of domestication remains unclear for most Amazonian crops. Manioc (Manihot esculenta) is the most important staple food crop that originated in this region. Although manioc is relatively well-studied, little is known about the diversification of bitter and sweet landraces and how they were dispersed across Amazonia. We evaluated single nucleotide polymorphisms (SNPs) in wild and cultivated manioc to identify outlier SNPs putatively under selection and to assess the neutral genetic structure of landraces to make inferences about the evolution of the crop in Amazonia. Some outlier SNPs were in putative manioc genes possibly related to plant architecture, transcriptional regulation and responses to stress. The neutral SNPs revealed contrasting genetic structuring for bitter and sweet landraces. The outlier SNPs may be signatures of the genomic changes resulting from domestication, while the neutral genetic structure suggests independent dispersals for sweet and bitter manioc, possibly related to the earlier domestication and diversification of the former. Our results highlight the role of ancient peoples and current smallholders in the management and conservation of manioc genetic diversity, including putative genes and specific genetic resources with adaptive potential in the context of climate change. (AU)

• FAPESP's process: 12/08307-5 - Genetic structure and mating system of local varieties and wild populations of annatto (Bixa orellana L.) in Brazilian Amazonia and Central Brazil using microsatellite markers
• Grantee: Elizabeth Ann Veasey
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/00036-9 - Genomic resources of manioc (Manihot esculenta) for the evolutionary study of cultivated varieties and in the search of important genes for breeding
• Grantee: Alessandro Alves Pereira
• Support Opportunities: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 13/08884-5 - Genetic structure and mating system of annatto (Bixa orellana L.) populations from the Brazilian Amazon and Central Brazil using microsatellite markers
• Grantee: Gabriel Dequigiovanni
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/00003-0 - Genetic diversity, genomics and phylogeography of manioc (Manihot esculenta Crantz): implications for the dispersion and diffusion of the crop along the main fluvial axes in Brazilian Amazon Basin
• Grantee: Maria Imaculada Zucchi
• Support Opportunities: Regular Research Grants