Flower morphogenesis and gametophyte fertility attest to the rare condition of gynomonoecy in Parietaria debilis (Urticaceae)

Autor(es)

Pedersoli, Giseli Donizete ^[1] ; Teixeira, Simone Padua ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Ave Cafe S-N, BR-14040903 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BOTANY; v. 98, n. 12, p. 703-715, DEC 2020.
• Citações Web of Science: 0

Resumo

Parietaria debilis G. Forst. is gynomonoecious, which is a rare condition in the Urticaceae family and among angiosperms. Apetalous flowers of two different morph types (monoclinous, pistillate) occur in the same inflorescence and are reduced in size and in the number of whorls and of organs per whorl. The objective of this study was to compare the morphogenesis of monoclinous and pistillate flowers to determine whether the monoclinous flowers produce fertile gametophytes, and elucidate the pathways leading to the absence of stamens and to the changes in number of whorls and organs per whorl. Flower buds and flowers (non-fertilized, fertilized) were processed for surface and anatomical studies. Pollen ultrastructure and viability were determined. Inflorescences with fertilized flowers were checked for the presence and location of fruits/viable seeds. The monoclinous flower has four sepals, four stamens, and a uniovulate pseudomonomerous gynoecium. In the pistillate flower, the stamens are absent or, rarely, aborted. No petals are formed. The gynoecium is pseudomonomerous, originated as a central primordium that differentiates into two carpels, but only one develops and houses an ovule. Monoclinous and pistillate flowers produce viable seeds. Thus, our data confirmed that this species is indeed gynomonoecious. (AU)

• Processo FAPESP: 13/19459-3 - Desenvolvimento floral de espécies de Urticaceae Juss.
• Beneficiário: Giseli Donizete Pedersoli
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/15644-8 - Desenvolvimento da flor e da inflorescência de espécies de Moraceae
• Beneficiário: Viviane Gonçalves Leite
• Modalidade de apoio: Bolsas no Brasil - Doutorado