Abstract
The purpose of this work was to identify hybrids in intraspecific crosses between sugar apple accessions and interspecific crosses between sugar apple and atemoya accessions by using RAPD markers. Four sugar apple accessions were selected: Seedless P1, P2, P3 and P4 and the atemoya cultivar Gefner (G1). In the pre-female phase the flowers were adequately protected and reciprocal crosses were performed. In crosses where the sugar apple accession Seedless P1 was used as the male parent, the fruits contained seeds, indicating that the pollen grains of Seedless P1 are viable. The fruits of reciprocal crosses where Seedless P1 was used as a female parent contained no seeds. The percentage of true hybrids in the crosses P4 x Seedless P1, P3 x Seedless P1, P2 x Seedless P1, and G1 x Seedless P1 were, respectively, 100%, 95.55%, 82.86%, and 44.44%. Primer OPF10 was efficient in obtaining polymorphic bands in all Annonaceae hybrid populations.
Highlights
The Annonaceae encompass a group of economically relevant fruit trees of several countries, e.g., Chile, Mexico, Australia, the USA, and Brazil
In Brazil, these crops are found from the northern region of the country to the state of São Paulo, but are grown mostly in the semiarid region
Annonaceae are planted on 10 thousand ha in Brazil, of which about 1,000 ha are atemoya, partly in the Northeast and partly in the Southeast region of the country (Nogueira et al 2005)
Summary
The Annonaceae encompass a group of economically relevant fruit trees of several countries, e.g., Chile, Mexico, Australia, the USA, and Brazil (Ferreira2001). In Brazil, these crops are found from the northern region of the country to the state of São Paulo, but are grown mostly in the semiarid region. Annona are fruit plants of commercial interest, such as sugar apple (Annona squamosa L.), soursop (Annona muricata L.), cherimoya (Annona cherimola Mill.) and atemoya (Annona squamosa x Annona cherimola) (Araujo et al 1999). Studies with these species indicate the occurrence of the phenomenon known as dichogamy of the protogynous type i.e., maturation of carpels before the stamens, limiting the occurrence of selfing (Pinto et al.2005)
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