Meiotic analysis of the germoplasm of three medicinal species from Asteraceae family / Análise meiótica do germoplasma de três espécies medicinais da família Asteraceae
Olkoski, Denise; Laughinghouse, Haywood Dail; Silva, Antonio Carlos Ferreira da; Tedesco, Solange Bosio.
Ciênc. rural
; 38(6): 1777-1780, jul.-set. 2008. ilus, tab
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en Inglés
| LILACS | ID: lil-492032
Cytogenetic characterization was carried out on 12 accessions from Aster squamatus (Spreng.) Hieron., Pterocaulon polystachyum DC, and Solidago microglossa DC by studying their meiotic behavior and pollen viability. These species are from the Asteraceae family, native to Rio Grande do Sul State, Brazil, and are important for medicinal use. Young inflorescences with four accessions of each species were collected, fixed in ethanol-acetic acid (31), and conserved in ethanol 70 percent until use. The method used was that of squashing the anthers and coloring with acetic orcein 2 percent. Meiosis was regular in all accessions, presenting chromosomal associations preferentially bivalent, where n=10 was found for Aster squamatus and n=9 for Pterocaulon polystachyum, and Solidago microglossa. The studied accessions presented a Meiotic Index (MI) that varied from 65 percent to 87 percent in Aster squamatus, 85 percent to 92 percent in Pterocaulon polystachyum, and 64 percent to 92 percent in Solidago microglossa, indicating meiotic stability, although irregularities appeared during the cellular division. The pollen viability estimative was high in all studied accessions. These results indicate that the studied species can be included in future studies of genetic breeding.
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