Expression of lorelei-like genes in aposporous and sexual Paspalum notatum plants

SILVINA ANDREA FELITTI; JOSE GUILLERMO SEIJO; A. M. GONZALEZ; MARICEL PODIO; NATALIA VERONICA LASPINA; LORENA SIENA; JUAN PABLO AMELIO ORTIZ ; SILVINA CLAUDIA PESSINO

PLANT MOLECULAR BIOLOGY

SPRINGER

Año: 2011 vol. 77 p. 337 - 354

0167-4412

Gametophytic apomictic plants form nonreduced embryo sacs that generate clonal embryos by parthenogenesis, in the absence of both meiosis and eggcell fertilization. Here we report the sequence and expression analysis of a lorelei-like Paspalum notatum gene, n20gap-1, which encodes a GPI-anchored protein previously associated with apomixis in this species. Phylogeny trees showed that n20gap-1 was evolutionary related to the Arabidopsis thaliana lorelei genes At4g26466 and At5g56170. The lorelei At4g26466 disruption was shown to be detrimental to sperm cell release in arabidopsis. RFLP (Restriction Fragment Length Polymorphism) analysis revealed the occurrence of several homologous sequences in the Paspalum notatum genome, exhibiting polymorphisms genetically linked to apomixis. Real-time PCR showed that lorelei-family genes present a minor activity peak at pre-meiosis and a major one at anthesis. The apomictic genotype analyzed showed a significantly increased activity at pre-meiosis, post-meiosis and anthesis with respect to a sexual genotype. In situ hybridization assays revealed expression in integuments, nucellus and the egg-cell apparatus. Several n20gap-1 alleles differing mainly at the 30 UTR sequence were identified. Allelespecific real-time PCR experiments showed that allele 28 was significantly induced in reproductive tissues of the apomictic genotype with respect to the sexual genotype at anthesis. Our results indicate that P. notatum lorelei-like genes are differentially expressed in representative sexual (Q4188) and apomictic (Q4117) genotypes, and might play a role in the final stages of the apomixis developmental cascade. However, the association of n20gap-1 expression with the trait should be confirmed in significant number of sexual and apomictic genotypes.