Hybrid identification in Nothofagus subgenus using high resolution melting with ITS and trnL approach

• Published in: PeerJ (San Francisco, CA) Vol. 7; p. e6779
• Main Authors: Solano, Jaime, Anabalón, Leonardo, Encina, Francisco, Esse, Carlos, Penneckamp, Diego
• Format: Journal Article
• Language: English
• Published: United States PeerJ. Ltd 09.05.2019; PeerJ, Inc; PeerJ Inc
• Subjects: Biodiversity; Botany; Deoxyribonucleic acid; DNA; Foliage; Forests; Gene pool; Genes; Genetics; HRM; Hybridization; Hybrids; ITS region; Logging; Melting; Melting curve; Molecular Biology; Morphology; Nothofagus; Nothofagus dombeyi; Nothofagus subgenus; Plant Science; Polymorphism; Ribosomal DNA; Silviculture; Species; Taxonomy; Timber; trnL locus; New Zealand; South America; New Guinea; Argentina; Chile; New Caledonia; Nothofagus; HRM; ITS region; Nothofagus subgenus; trnL locus
• ISSN: 2167-8359; 2167-8359
• DOI: 10.7717/peerj.6779

The genus is the main component of southern South American temperate forests. The 40 species, evergreen and deciduous, and some natural hybrids are spread among Central and Southern Chile, Argentina, New Zealand, Australia, New Guinea and New Caledonia. , and are potentially very important timber producers due to their high wood quality and relative fast growth; however, indiscriminate logging has degraded vast areas the Chilean forest causing a serious state of deterioration of their genetic resource. The South of Chile has a large area covered by secondary forests of . These forests have a high diversity of species, large amount of biomass and high silvicultural potential. This work shows a case of hybrid identification in subgenus in different secondary forests of Chile, using high resolution melting. Unknown samples of subgenus are genetically distinguishable with the ITS region of , and species. It was not possible to distinguish between unknown samples of Andean versus coastal origin. Melting curves with ITS approach of unknown material are genetically similar, positioned between and and distant from . The unknown samples are genetically very close to . This suggests the presence of hybrid individuality between species ( × ) with the possibility of introgression towards the gene pool of , producing the deciduous foliage that is both present. The trnL locus has no distinction between the and species, since a similar melting curve is present and equal Tm (80.00 °C). The trnL locus cannot be genetically distinguished from one unknown sample of to another, as highlighted in this study.