PIWI: Difference between revisions

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== Origin and definition ==

PIWI varieties are the result of targeted breeding programmes that combine resistance traits from non-[[Vitis vinifera]] species with vinifera parentage, followed by successive backcrossing to recover wine-quality characteristics.<ref>Becker, ''PIWI Grape Varieties'', Becker Verlag, 2014, ISBN 978-3897983863.</ref> Unlike early interspecific hybrids developed in the 19th and early 20th centuries, modern PIWI cultivars are selected specifically for both disease resistance and sensory suitability in wine.

[[[[PIWI]] varieties]] are the result of targeted breeding programmes that combine resistance traits from non-[[Vitis vinifera]] species with vinifera parentage, followed by successive backcrossing to recover wine-quality characteristics.<ref>Becker, ''PIWI Grape Varieties'', Becker Verlag, 2014, ISBN 978-3897983863.</ref> Unlike early interspecific hybrids developed in the 19th and early 20th centuries, modern PIWI cultivars are selected specifically for both disease resistance and sensory suitability in wine.

The term is descriptive rather than genetic, referring to functional resistance rather than a strict taxonomic category.<ref>Robinson, Harding & Vouillamoz, ''Wine Grapes'', HarperCollins, 2012, ISBN 978-0062206367.</ref>

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 == Origin and definition ==
-PIWI varieties are the result of targeted breeding programmes that combine resistance traits from non-[[Vitis vinifera]] species with vinifera parentage, followed by successive backcrossing to recover wine-quality characteristics.<ref>Becker, ''PIWI Grape Varieties'', Becker Verlag, 2014, ISBN 978-3897983863.</ref> Unlike early interspecific hybrids developed in the 19th and early 20th centuries, modern PIWI cultivars are selected specifically for both disease resistance and sensory suitability in wine.
+[[[[PIWI]] varieties]] are the result of targeted breeding programmes that combine resistance traits from non-[[Vitis vinifera]] species with vinifera parentage, followed by successive backcrossing to recover wine-quality characteristics.<ref>Becker, ''PIWI Grape Varieties'', Becker Verlag, 2014, ISBN 978-3897983863.</ref> Unlike early interspecific hybrids developed in the 19th and early 20th centuries, modern PIWI cultivars are selected specifically for both disease resistance and sensory suitability in wine.
 The term is descriptive rather than genetic, referring to functional resistance rather than a strict taxonomic category.<ref>Robinson, Harding & Vouillamoz, ''Wine Grapes'', HarperCollins, 2012, ISBN 978-0062206367.</ref>