INVESTIGADORES
LIJAVETZKY Diego Claudio
artículos
Título:
Molecular genetics of berry colour variation in table grape
Autor/es:
LIJAVETZKY, D; RUIZ-GARCIA, L; CABEZAS, JA; DE ANDRES, MT; BRAVO, G; IBANEZ, A; CARRENO, J; CABELLO, F; IBANEZ, J; MARTINEZ-ZAPATER, JM
Revista:
MOLECULAR GENETICS AND GENOMICS
Referencias:
Año: 2006 vol. 276 p. 427 - 435
ISSN:
1617-4615
Resumen:
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The genetics and biochemistry of anthocyanins and Xavonol
biosynthesis and their role in plant organ pigmentation is well established in
model species. However, the genetic basis of colour variation is species speciWc and
understanding this variation is very relevant in many fruit and Xower crop species.
Among grape cultivars, there is a wide genetic variation for berry colour
ranging from yellow-green (white cultivars) to dark blue berries. Berry
colour results from the synthesis and accumulation of anthocyanins in the berry
skin, which in plants is commonly regulated by transcription factors belonging
to the MYB and bHLH families. In this work, we aimed to identify the major genetic
determinants of berry colour variation in a large collection of table grape
cultivars and somatic variants. The genetic analyses of berry colour in a few grape
segregating progenies had previously identiWed a single locus on linkage group 2 responsible for
colour variation. Furthermore, somatic variation for berry skin colour in
cultivar Italia had been associated with the presence of a Gret1 retrotransposon in
the promoter region of VvmybA1, a Myb gene whose expression is associated to skin
colouration. The results show that VvmybA1 is the gene underlying the mapped locus controlling
berry colour in grape. Additionally, the molecular analyses indicate that
genetic and somatic berry colour variation can be associated to molecular variation
at VvmybA1 in more than 95% of the analyzed cultivars. Thus, VvmybA1 is a major
determinant of berry colour variation in table grape and its instability is the
major cause of somatic variation for this trait.