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Study of the INNER NO OUTER (INO) gene in Prunus species. Implications for the evolution of ovule development in angiosperms

AuthorsLora, Jorge ; Hormaza Urroz, José Ignacio; Herrero Romero, María
Issue Date13-Jul-2014
CitationXXIII International Congress on Sexual Plant Reproduction (13-18.07.2014, Oporto, Portugal)
AbstractWhile gymnosperms ovules have a single integument, most angiosperms have bitegmic ovules although unitegmic ovules have arisen independently several times during the evolution of flowering plants. The genetic regulation behind integument development has been mainly studied in the model plant Arabidopsis where the INNER NO OUTER (INO) gene, expressed exclusively in the outer integument, has been found essential for ovule development, but also for ovule fertility. The Rosaceae, a family among the core eudicots and the third most economically important angiosperm family in temperate regions, shows great ovule morphological diversity. Thus, in the same genus (Prunus) species with bitegmic and unitegmic ovules can be found. In this work we perform a microscopic study on ovule development and follow the expression pattern of the INO gene in P. armeniaca (apricot), P. persica (peach) and P. incisa. The morphologic study of ovule development showed bitegmic ovules in P. armeniaca, intermediate bifid ovules in P. persica and unitegmic ovules in P. incisa. However, the characterization of INO expression by in situ hybridization revealed similar expression patterns in the outer integument of P. armeniaca and P. persica and in the single integument of P.incisa. These results show the conservation of INO gene expression in Prunus species and confirm that the identity of the outer integument is also present in the intermediate bifid species P. persica and the unitegmic species P. incisa supporting the hypothesis of fusion of the outer and inner integuments that could represent a widespread situation in other unitegmic species in flowering plants.
Appears in Collections:(EEAD) Comunicaciones congresos
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