| Full text | |
| Author(s): |
Caetano, Ana Paula S.
[1, 2]
;
Cortez, Priscila A.
[3]
;
Teixeira, Simone P.
[4]
;
Oliveira, Paulo E.
[5]
;
Carmello-Guerreiro, Sandra M.
[6]
Total Authors: 5
|
| Affiliation: | [1] Univ Estadual Campinas, Inst Biol, Programa Posgrad Biol Vegetal, Campinas, SP - Brazil
[2] Univ Fed Uberlandia, Inst Biol, Programa Posgrad Ecol & Conservacao Recursos Nat, Uberlandia, MG - Brazil
[3] Univ Estadual Santa Cruz, Dept Ciencias Biol, Ctr Microscopia Eletron, Ilheus, BA - Brazil
[4] Univ Sao Paulo, Dept Ciencias Farmaceut, Fac Ciencias Farmaceut Ribeirao Preto, Ribeirao Preto, SP - Brazil
[5] Univ Fed Uberlandia, Inst Biol, Uberlandia, MG - Brazil
[6] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Campinas, SP - Brazil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | PLANT SYSTEMATICS AND EVOLUTION; v. 304, n. 3, p. 343-355, MAR 2018. |
| Web of Science Citations: | 2 |
| Abstract | |
Apomixis, the asexual formation of seeds, seems to be a reproductive alternative for many angiosperms, involving various pathways with different genetic and ecological consequences. It is common in some megadiverse tropical groups such as Melastomataceae, of which approximately 70% of the species studied so far in the tribe Miconieae are autonomous apomictics. Hence, Miconia appears to be a good model for the study of the embryological pathways associated with apomixis. In the present study, we analyzed the polyploid and autonomous apomictic M. fallax and compared its embryology to that of the diploid and sexual M. pepericarpa, both treelets species common in the Cerrado, the Neotropical savanna areas of Central Brazil. Ovule structure and basic megasporogenesis and megagametogenesis events were similar in both species. However, M. fallax showed exclusive features associated with apomixis: aposporous embryo sac development, with the parthenogenetic development of unreduced egg cells, autonomous endosperm formation, nucellar embryony and polyembryony. Moreover, both gametophytic and sporophytic apomixis occurred in parallel to the development of a sexual embryo sac, a rarely described condition, which probably confers a great reproductive flexibility to the species. (AU) | |
| FAPESP's process: | 08/10793-0 - Embryology in Miconia (Melastomataceae) species with different reproductive systems |
| Grantee: | Sandra Maria Carmello-Guerreiro |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 10/15077-0 - Apomixis, sexuality, polyploidy and pollen viability in the Neotropical tribe Miconieae (Melastomataceae) |
| Grantee: | Ana Paula de Souza Caetano |
| Support Opportunities: | Scholarships in Brazil - Doctorate |