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Hybrid identification in Nothofagus subgenus using high resolution melting with ITS and trnL approach
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Hybrid identification in Nothofagus subgenus using high resolution melting with ITS and trnL approach
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Journal Article
Hybrid identification in Nothofagus subgenus using high resolution melting with ITS and trnL approach
2019
Overview
The genus
Nothofagus
is the main component of southern South American temperate forests. The 40
Nothofagus
species, evergreen and deciduous, and some natural hybrids are spread among Central and Southern Chile, Argentina, New Zealand, Australia, New Guinea and New Caledonia.
Nothofagus nervosa
,
Nothofagus obliqua
and
Nothofagus dombeyi
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
Nothofagus dombeyi
. 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
Nothofagus
subgenus in different secondary forests of Chile, using high resolution melting. Unknown samples of
Nothofagus
subgenus are genetically distinguishable with the ITS region of
Nothofagus antarctica
,
Nothofagus nitida
and
N. obliqua
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
N. dombeyi
and
N. antarctica
and distant from
N. nitida
. The unknown samples are genetically very close to
Nothofagus dombeyi
. This suggests the presence of hybrid individuality between species (
N. dombeyi
×
N. antarctica
) with the possibility of introgression towards the gene pool of
N. antarctica
, producing the deciduous foliage that is both present. The trnL locus has no distinction between the
N. dombeyi
and
N. antarctica
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
Nothofagus
to another, as highlighted in this study.
