Floral and reproductive biology of Alcantarea nahoumii (Bromeliaceae), a vulnerable endemic species of the Atlantic Forest

• Published in: Acta Botânica Brasílica Vol. 31; no. 4; pp. 665 - 676
• Main Authors: Bastos, Maria Josirene Souza Moreira, Bastos, Lucimário Pereira, Souza, Everton Hilo de, Soares, Taliane Leila, Morais, Daniel Vieira, Souza, Fernanda Vidigal Duarte de, Costa, Maria Angélica Pereira de Carvalho
• Format: Journal Article
• Language: English
• Published: Sociedade Botânica do Brasil 01-12-2017
• Subjects: Bromeliaceae; floral visitors; nectar; pollen viability; reproductive systems; stigma receptivity
• ISSN: 0102-3306; 1677-941X; 0102-3306
• DOI: 10.1590/0102-33062017abb0102

ABSTRACT Alcantarea nahoumii occurs exclusively in the state of Bahia, Brazil, and is classified as vulnerable due to deforestation and frequent fires in the region. Knowledge of floral and reproductive biology is fundamental to understanding ecological interactions, as well as the reproductive success of plant species. The objective of this study was to evaluate the floral and reproductive biology of A. nahoumii in an Atlantic Forest fragment with regard to phenology, pollen viability, stigma receptivity, pollination ecology and reproductive systems, all of which are important parameters for of the development of conservation strategies for the species. Anthesis is diurnal and heterogeneous, starting at 6:30 a.m. and lasting until 8:00 a.m. Highest germination percentages and greatest pollen tube lengths were obtained in BK culture medium. Histochemical tests revealed high pollen viability (89.71 %). Stigma receptivity occurred during anthesis and lasted for up to 24 hours after floral opening. Alcantarea nahoumii exhibited preferential allogamy and self-compatibility, and required a pollinator to production of viable seeds. Sixteen species of pollinators were observed visiting A. nahoumii, among which were five hummingbird species. Even though its reproductive system is efficient, this bromeliad remains threatened mainly due to habitat fragmentation caused by deforestation, burning and predatory extractivism.