Sumario: | Pedro Giménez' is a white criolla variety
cropped in Argentina, mainly in Mendoza
and San Juan, being the most planted
white variety destined for wine making in
the country. Its origin remains unknown, as
well as its relationship with Spanish variety
'Pedro Ximénez', mostly grown in Jerez,
Spain. Previous works have probed that most
of Criollas varieties existing in America at
the moment, are the offspring of 'Muscat of
Alexandria' x 'Criolla Chica'. The aim of the
present work was to compare 'Pedro Giménez'
with the Spanish variety 'Pedro Ximénez',
and to establish its degree of relatedness
to 'Muscat of Alexandria' and 'Criolla Chica'.
Therefore we used a set of 18 nuclear SSR loci
and 3 chloroplast SSR loci. 'Pedro Giménez'
shared only 38% of the alleles under analysis
with 'Pedro Ximénez', indicating that they
are indeed two different varieties. In all 18
polymorphic nuclear SSR loci 'Pedro Giménez'
shared 50% of its alleles with 'Muscat of
Alexandria', while the other 50% of the alleles
present in 'Pedro Giménez' were also present
in 'Criolla Chica'. This data, along with those
from the chloroplast SSR analysis, strongly
suggest that 'Pedro Giménez' is the progeny
of 'Muscat of Alexandria' x 'Criolla Chica', being
the latest one the most likely female progenitor.
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