@article {Correa212, author = {Jos{\'e} Correa and Maribel Mamani and Claudia Mu{\~n}oz-Espinoza and Mauricio Gonz{\'a}lez-Ag{\"u}ero and Bruno G. Defilippi and Reinaldo Campos-Vargas and Manuel Pinto and Patricio Hinrichsen}, title = {New Stable QTLs for Berry Firmness in Table Grapes}, volume = {67}, number = {2}, pages = {212--217}, year = {2016}, doi = {10.5344/ajev.2015.15049}, publisher = {American Journal of Enology and Viticulture}, abstract = {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 {\texttimes} Sultanina (n = 137) was evaluated during three consecutive seasons. Results showed that even though the heritability was ~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 ~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.}, issn = {0002-9254}, URL = {https://www.ajevonline.org/content/67/2/212}, eprint = {https://www.ajevonline.org/content/67/2/212.full.pdf}, journal = {American Journal of Enology and Viticulture} }