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VviAPRT3 and VviFSEX: two genes involved in sex specification able to distinguish different flower types in Vitis
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Orientador(es)
Resumo(s)
Vitis vinifera vinifera is a hermaphrodite subspecies, while its ancestor, Vitis vinifera
sylvestris, is dioecious. We have identified two genes that together allow the
discrimination between male, female and hermaphrodite Vitis plants. The sex locus
region on chromosome 2 was screened resulting in the discovery of a new gene,
VviFSEX. The same screening revealed another gene, VviAPRT3, located in the sex
region, that be used as a sex marker. Both genes are good candidates to be involved in
flower sex differentiation in grapevine. To assess their role in sex specification, spatial and
temporal expression analysis was performed. The expression of VviFSEX is detected in
petals, stamens and carpel primordia of all flower types, making its putative function
unclear; however, female plants display a single allele for this gene, while male and
hermaphrodites display two alleles. On the other hand, the specific expression of
VviAPRT3 in the carpel primordial of male plants suggests a possible role in the abortion
of pistil structures. We propose a model to explain the carpel abortion in male flowers
and the absence of stamen viability in female flowers. In addition, this work reinforces
the presence of a sex locus on Vitis chromosome 2
Descrição
Palavras-chave
Vitis hermaphrodite dioecious flower gene marker sex
Contexto Educativo
Citação
Coito JL, Ramos MJN, Cunha J, Silva HG, Amâncio S, Costa MMR and Rocheta M (2017) VviAPRT3 and VviFSEX: Two Genes Involved in Sex Specification Able to Distinguish Different Flower Types in Vitis. Front. Plant Sci. 8:98.
Editora
Changbin Chen (ed.)