Chromosomal diversity in two synchronopatric species of Hoffmannseggella (Orchidaceae)

Autor(es)

Yamagishi-Costa, Julia ^{[1, 2]} ; Forni-Martins, Eliana Regina ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Uberlandia, Inst Biol, BR-38400902 Uberlandia, MG - Brazil

^[2] Univ Estadual Campinas, Grad Program, Campinas, SP - Brazil

^[3] Univ Estadual Campinas UNICAMP, Inst Biol, Depto Biol Vegetal, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NORDIC JOURNAL OF BOTANY; v. 31, n. 4, p. 505-509, AUG 2013.
• Citações Web of Science: 1

Resumo

Hoffmannseggella viridiflora Verola \& Semir (Laeliinae, Orchidaceae) is a recently discovered species in the campos rupestres vegetation of the Espinhaco Range, MG, Brazil, in synchronopatry with H. bradei (Pabst) V. P. Castro \& Chiron. Both morphological and phenological studies indicate that these species are closely related. H. bradei having 2n = 40 and H. viridiflora having 2n = 44 chromosomes, an aneuploid number not previously documented in the genus. Meiotic behavioral studies undertaken with H. bradei revealed many abnormalities related to bivalent numbers and chromosome migration, suggesting that meiotic abnormalities could generate aneuploid gametes and perhaps aneuploid zygotes. Karyotype formulas and chromosome morphologies are quite different between the species, so H. viridiflora was not directly derived from H. bradei through simple chromosome additions. Complementary analyses are necessary to understand the process and species involved in the origin of H. viridiflora. (AU)

• Processo FAPESP: 02/07750-0 - Citotaxonomia e aspectos evolutivos de especies de laelia lindl sectio parviflorae ( orchidaceae) de campos rupestres brasileiros.
• Beneficiário: Julia Yamagishi Costa
• Modalidade de apoio: Bolsas no Brasil - Doutorado