INVESTIGADORES
PASTORINO Mario Juan
artículos
Título:
Genetic versus environmental contributions to variation in seedling resprouting in Nothofagus obliqua
Autor/es:
APARICIO, ALEJANDRO; ZUKI, SEBASTIÁN; AZPILICUETA, MARÍA MARTA; BARBERO, FERNANDO; PASTORINO, MARIO JUAN
Revista:
TREE GENETICS & GENOMES
Editorial:
SPRINGER HEIDELBERG
Referencias:
Lugar: HEIDELBERG; Año: 2015 vol. 11
ISSN:
1614-2942
Resumen:
Resprouting is an almost universal functional trait
in temperate angiosperms and confers persistence at an individual
level after the loss of above-ground biomass. The importance
of genetic versus environmental sources of intraspecific
variation in resprouting traits is largely unknown. We
conducted two genetic field trials, 400 m apart in altitude, in
order to sequentially assess seedling resprouting in four environmentally
contrasting Argentinean populations of
Nothofagus obliqua Mirb. (Oerst). We also performed one
nursery test to determine whether populations differed in early
root/shoot biomass partition, a key trade-off affecting
resprouting. Initial resprouting vigour and final survival were
higher in our warmer test site, located 300 m below the core
range of the species. The main contrasts between populations
were found for pre-clipping seedling size and resprouting profusion,
the latter trait showing a clear trade-off with
resprouting vigour. Site×population interactions were due
mainly to the behaviour of the highest altitude population,
suggesting its divergent adaptive trajectory and higher plasticity
for resprouting traits. Within populations, trait heritability
was low, in general. Episodic frost, which may limit
resprouting vigour and final success, had a lower incidence
in the altitudinal and xeric limit populations. Overall, our work
revealed genetic variation between populations of N. obliqua
in traits that determine the success of seedling resprouting,
probably associated with divergent selection. Low trait heritability
suggests limited in situ micro-evolutionary capacities
for resprouting traits under ongoing climate warming; phenotypic
plasticity may play an important role in population persistence
at the low positions of the elevation gradients
N. obliqua currently inhabits.