New Stable QTLs for Berry Firmness in Table Grapes
Author
dc.contributor.author
Correa, José
Author
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Mamani, Maribel
Author
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Muñoz Espinoza, Claudia
Author
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González Agüero, Mauricio
Author
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Defilippi, Bruno G.
Author
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Campos Vargas, Reinaldo
Author
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Pinto, Manuel
Author
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Hinrichsen, Patricio
Admission date
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2016-12-07T20:16:19Z
Available date
dc.date.available
2016-12-07T20:16:19Z
Publication date
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2016-04
Cita de ítem
dc.identifier.citation
Am. J. Enol. Vitic. 67:2 (2016)
es_ES
Identifier
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1943-7749
Identifier
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10.5344/ajev.2015.15049
Identifier
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https://repositorio.uchile.cl/handle/2250/141743
Abstract
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Berry firmness is one of the most important quality traits in table grape production and, consequently, a key aspect for table grape breeding programs. To identify the genes determining the berry firmness in grapes, a progeny of Ruby Seedless x Sultanina (n = 137) was evaluated during three consecutive seasons. Results showed that even though the heritability was similar to 90%, season had an important effect on this trait. Quantitative trait loci (QTL) analysis and genetic mapping showed that the determinants for this trait are distributed in linkage groups 8 and 18. This is the first time that a stable QTL for berry firmness across seasons has been identified on linkage group 8. This QTL is mainly given by a male allelic and additive effect. Together, these two QTLs explained similar to 27.6% of the phenotypic variance, with confidence intervals of up to 10 cM. Among the tens of genes found in these two QTLs, we highlight a cation/calcium exchanger, a xylosyltransferase, a probable cellulose synthase, and a putative invertase. This study shows that berry firmness has a clear genetic basis. These results could also be used for the development of markers to assist table grape breeding.