olecular cytogenetics of Dictyoloma vandellianum A. Juss. and the ancestral karyotype of Rutacea

Autor(es)

Santos, Amanda ^[1] ; Silva, Ana Emilia Barros E. ^[2] ; Groppo, Milton ^[3] ; Guerra, Marcelo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Pernambuco, Lab Citogenet & Evolucao Plantas, Dept Bot, Ctr Biociencias, BR-50670901 Recife, PE - Brazil

^[2] Univ Fed Paraiba, Lab Citogenet Plantas, Dept Biociencias, Ctr Ciencias Agr, BR-58397000 Areia, PB - Brazil

^[3] Univ Sao Paulo, Dept Biol, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14051901 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Acta Botanica Brasilica; v. 35, n. 4, p. 582-588, OCT-DEC 2021.
• Citações Web of Science: 1

Resumo

Determination of the chromosome base number of a taxon is fundamental to understanding karyotypic variation and its implications for the evolution of that group. This usually requires careful evaluation of cytological literature and robust phylogenetic support. The base number for the family Rutaceae (x = 9 or x = 18) has long been the subject of debate. Here, we analyzed the banding pattern, rDNA sites, and genome size of Dictyoloma vandellianum, subfamily Cneoroideae, the sister group of the remaining Rutaceae, and revised critical points about the chromosome base number of the family. We found that this species has n = 9, which differs from the n = 18 possessed by other cytologically known Cneoroideae species. Thus, n = 9 occurs in the main clades of Rutaceae and is the most probable base number of the family. The hypothesis of x = 18 as the base number is no longer sustainable, although n = 18 is very common in Rutaceae. Moreover, the fluorescent banding pattern and the relatively large genome size (1C = 1.3 pg) of D. vandellianum suggest that its chromosomal organization is highly divergent from Aurantieae, the only large Rutaceae clade where species with n = 9 are greatly dominant. (AU)

• Processo FAPESP: 16/06260-2 - Estudos sistemáticos integrados em famílias neotropicais, com ênfase em Rutaceae, Asteraceae e Rubiaceae
• Beneficiário: Milton Groppo Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/06336-0 - Estudos filogenéticos e sistemáticos em Rutaceae: análise cladística e posicionamento de Almeidea A.St.-Hil. entre as Galipeinae (Galipeae, Rutoideae) baseados em dados morfológicos e moleculares
• Beneficiário: Carla Poleselli Bruniera
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 06/03170-0 - Estudos filogenéticos e sistemáticos em Rutaceae: filogenia e delimitação de Galipeinae (Galipeae) baseados em seqüências do DNA do núcleo e cloroplasto
• Beneficiário: Milton Groppo Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores