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. 2021 Jan 15;11:605934. doi: 10.3389/fpls.2020.605934

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Copyright © 2021 D’Onofrio, Tumino, Gardiman, Crespan, Bignami, de Palma, Barbagallo, Muganu, Morcia, Novello, Schneider and Terzi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Network of main POs among Italian varieties organized according to their geographic areas. The arrows indicate PO’s direction. Bold names indicate POs reported for the first time in this study. Anthropogenic crosses are highlighted in light-blue. Parents of foreign origin contributing into spontaneous crosses are highlighted in yellow with their alleged geographic groups. Parents from the cluster of Muscat varieties are highlighted in brown. Red connectors refer to still doubtful PO direction. Connectors without arrow refer to PO without direction.