An integrative genetic study of the bunch compactness trait in grapevine
Grapevine (Vitis vinifera L.) bunch compactness is an important trait affecting the quality and sanitary status of table and wine grapes. In spite of its agronomic and commercial relevance, little is known about the molecular and genetic mechanisms underpinning this trait. Some reasons are the great number of factors affecting the trait (it arises from the integration of numerous bunch and berry attributes), and the lack of a reliable and globally accepted method for its objective and quantitative evaluation. One of the main aims of this work was the dissection of bunch compactness at a multicultivar level to identify the main bunch and berry attributes affecting the trait. Thus, a large number of bunches of a diverse grapevine collection of wine and table grape varieties was evaluated for many traits during three consecutive seasons (2011, 2012 and 2013). Univariate statistical analyses indicated that most of the studied traits might have an influence on bunch compactness natural variation, confirming its multifactorial nature. Further multivariate analyses showed that the number of berries per bunch and the length of the rachis ramifications have a major influence on bunch compactness, whereas berry dimensions play a secondary role. Consequently, they arise as the most appropriate target traits to unravel the genetic determinism of bunch compactness.
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| Formato: | tesis doctoral biblioteca |
| Publicado em: |
Universidad Autónoma de Madrid
2016-05-13
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| Acesso em linha: | http://hdl.handle.net/10261/148930 |
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