Are you A.S. RODRIGUES?

Claim your profile

Publications (3)0.37 Total impact

  • Flora do Parque Estadual do Ibitipoca e seu entorno., Edited by Rafaela C. Forzza, Luiz Menini Neto, Fatima R. Salimena, Daniela C. Zappi, 01/2013: chapter Germinação de sementes de duas espécies de Bromeliaceae do Parque Estadual do Ibitipoca: pages p. 331-348.; UFJF., ISBN: 978857672187-2
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The germination behaviour of four Bromeliaceae species [Alcantarea imperialis (Carrière) Harms, Pitcairnia flammea Lindl., Vriesea heterostachys (Baker) L. B. Sm. and Vriesea pendulifl ora L. B. Sm.] from Ibitipoca State Park with contrasting habitat preferences, and representing two different plant growth forms were investigated. The aims of this study were: a) to characterize the seeds, providing information about germination type to describe the post-seminal development morphology; b) to evaluate percentage and rate of germination response to the effect of constant (from 10 °C to 40 °C) and fluctuating (20 °C-30 °C) temperatures; c) the ratio of red:far-red light (R:FR) and d) to different water potentials. The results showed that all species have very light seeds, ranging from 0.2 to 1.7 mg; the germination is epigeal with cryptocotylar seedlings. All species presented high germination under temperatures between 20 °C and 30 °C. Under darkness germination was successful only for Vriesea species, but seeds of all species required light for maximum germination. The R:FR value that resulted in 50% of maximum germination varied among species. Water stressed conditions reduced the percentage and rate of germination in all bromeliad species. A. imperialis and P. fl ammea were less sensitive to low water potentials. These contrasting germination requirements among the species studied were related to their habitat preferences.
    Revista Brasileira de Botânica 01/2009; V.32:827-838.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The aim of this study was to characterize the seeds, providing information about germination type and seedling rate, in addition to describe the post-seminal development morphology of the six species of Bromeliaceae. The results showed that the germination is epigeal with cryptocotylar seedlings. Maximum germination percentage was over 80%, for all species, indicating high physiological quality of the seeds. Germination and seedling rate was 4-15 and 8-18 days, respectively. Seeds are filiform to elliptical, smooth or with flight apparatus. The most relevant morphological characters for distinguishing among genera and subfamilies are shape and appendices of the seeds, form and size of the cotyledonal sheath, hypocotyl and primary root, providing information on taxonomic, ecological and seed technology studies.
    Acta Botanica Brasilica 01/2008; 22:1150-1162. · 0.37 Impact Factor