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Published on December 29, 2005; 10.1104/pp.105.067488

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Received June 20, 2005
Returned for revision August 23, 2005
Accepted December 7, 2005

The grapevine flb mutation: A unique genotype to investigate differences between fleshy and non-fleshy fruit

Lucie Fernandez , Charles Romieu , Annick Moing , Alain Bouquet , Mickael Maucourt , Mark R. Thomas , and Laurent Torregrosa *

UMR BEPC, Campus Agro-M/INRA, 2 place Viala, 34060, Montpellier Cedex 01, France
UMR PBV, Université Bordeaux 1 & 2, BP 81, 33883 Villenave d'Ornon, France
CSIRO Plant Industry, PO Box 350, Glen Osmond, SA 5064, Australia

* Corresponding author; email: laurent.torregrosa{at}ensam.inra.fr.

In flowering plants, fruit morphogenesis is a distinct process following fertilization resulting in the formation of a specialized organ associated with seeds. Despite large variations in types and shapes among species, fleshy fruits share common characteristics to promote seed dispersal by animals such as organ growth and metabolite accumulation to attract animal feeding. The molecular biology of fruit ripening has received considerable attention but little is known about the determinism of early fruit morphogenesis and why some fruits are fleshy while others lack flesh. We have identified in Vitis vinifera L. a mutation we have named flb (fleshless berry) that reduces by 20 times the weight of the pericarp at ripening without any effect on fertility or seed size and number. The flb mutation strongly impaired division and differentiation of the most vacuolated cells in the inner mesocarp. The timing of ripening was not altered by the mutation although the accumulation of malic acid in the green stage was noticeably reduced while sucrose content (instead of hexoses) increased during ripening. The mutation segregates as a single dominant locus. These results indicate that the Flb- mutant is suitable material to advance our understanding of the genetic and developmental processes involved in the differentiation of an ovary into a fruit.




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