A natural intergeneric hybrid of Gesneriaceae from Brazil

Autor(es)

de Araujo, Andrea Onofre ^[1] ; Peixoto, Mauro ^[2] ; de Souza, Cintia Neves ^[3] ; Gasparino, Eduardo Custodio ^[4] ; Faria, Juliana Toledo ^[5] ; Lombello, Ricardo Augusto ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Ctr Ciencias Humanas & Biol, Dept Biol, Sorocaba, SP - Brazil

^[2] Caixa Postal 383, BR-08710971 Mogi Dos Cruzes, SP - Brazil

^[3] Univ Sao Paulo, Fac Filosofia Ciencias & Letras, Programa Posgrad Biol Comparada, Ribeirao Preto - Brazil

^[4] Univ Estadual Paulista, Fac Ciencias Agr & Vet Jabotical, Jaboticabal - Brazil

^[5] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYTOTAXA; v. 497, n. 2, p. 79-96, APR 20 2021.
• Citações Web of Science: 0

Resumo

A natural hybrid between Goyazia and Mandirola (Gloxiniinae, Gesneriaceae) from Cerrado (Brazil) is here described, supported by pollen morphology, cytological data and morphological characters. The microsporogenesis of Mandirola hirsuta and that of the hybrid were analyzed in order to evaluate the cytogenetic characteristics. The haploid chromosome numbers observed were n = 12 for M. hirsuta and n = 11, 13, 16 and 26 for the hybrid. Structural abnormalities (monads, dyads, triads and micronuclei) were observed at the final of the hybrid?s meiosis. High viability rates of the pollen were recorded for Goyazia and Mandirola (>90%) and low viability for the hybrid (34.7%). The pollen grains were acetolyzed, measured and photographed for pollen morphology analysis. Quantitative pollen data were analyzed through descriptive and multivariate statistics. The hybrid has intermediate pollen characteristics between G. petraea and M. hirsuta; it is more related to G. petraea by the measures of diameters and ectoapertures; it is more similar to M. hirsuta mainly regarding the microreticulum on the mesocolpium region. The hybrid and Mandirola share vegetative and flower size, while the colors of the hybrid are similar to Goyazia. Pollen morphology, cytological data and morphological characters brought clear evidence for the recognition of the intergeneric hybrid, which we named as Goydirola x punctata. (AU)

• Processo FAPESP: 15/02707-0 - Palinotaxonomia em espécies brasileiras de Gloxiniinae com ênfase no complexo Mandirola-Goyazia
• Beneficiário: Cintia Neves de Souza
• Modalidade de apoio: Bolsas no Brasil - Mestrado