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Comparative inflorescence development in selected Andean Santalales.
Suaza-Gaviria, Vanessa; González, Favio; Pabón-Mora, Natalia.
Afiliação
  • Suaza-Gaviria V; Universidad de Antioquia, Instituto de Biología, Medellín, AA 1226, Colombia.
  • González F; Universidad Nacional de Colombia, Facultad de Ciencias, Instituto de Ciencias Naturales, Sede Bogotá, AA 7495, Colombia.
  • Pabón-Mora N; Universidad de Antioquia, Instituto de Biología, Medellín, AA 1226, Colombia lucia.pabon@udea.edu.co.
Am J Bot ; 104(1): 24-38, 2017 01.
Article em En | MEDLINE | ID: mdl-28057689
ABSTRACT
PREMISE OF THE STUDY Loranthaceae, Santalaceae, and Viscaceae are the most diversified hemiparasitic families of Santalales in the Andes. Their partial inflorescences (PIs) vary from solitary flowers, or dichasia in most Santalales, to congested floral groups along articles in most Viscaceae. The atypical articled inflorescences in Phoradendreae (Viscaceae), a phylogenetic novelty restricted to this tribe, have been variously described as racemes, spikes, fascicles, or as intercalary inflorescences, but no developmental studies have been performed to compare them with the construction of PIs across Santalales.

METHODS:

We used standard light microscopy and scanning electron microscopy to record the inflorescence development in members of Phoradendreae (Viscaceae) in comparison to those in species of Aetanthus, Gaiadendron, Oryctanthus, Passovia, and Peristethium (Loranthaceae) and Antidaphne (Santalaceae). KEY

RESULTS:

Morphological and developmental comparisons as well as optimization onto a phylogenetic framework indicate that individual inflorescences in Santalales are indeterminate and are formed by axillary cymose PIs. The latter correspond to dichasia, either simple, compound, or variously reduced by abortion of lateral flowers, abortion of the terminal flower, or loss of bracteoles.

CONCLUSIONS:

Dichasia are plesiomorphic in Santalales. These results favor the interpretation that inflorescences in Phoradendreae are formed by the fusion of serial dichasia (=floral rows) with the main inflorescence axis via syndesmy. We compared this interpretation with the competing one based on the co-occurrence of collateral and serial floral buds.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Magnoliopsida / Flores / Inflorescência Idioma: En Revista: Am J Bot Ano de publicação: 2017 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Magnoliopsida / Flores / Inflorescência Idioma: En Revista: Am J Bot Ano de publicação: 2017 Tipo de documento: Article