Systematic revision of the genus Doryopteris J.Sm. (Pteridaceae-Cheilanthoideae)

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Doryopteris majestosa (Pteridaceae), a New Species from South America

Volume: 97Start Page: 212End Page: 21

Aspectos anatômicos da cultura in vitro da Araucaria angustifolia. II. 0 enraizarnento dos brotos axilares

Foram estudados os aspéctos anatômicos da estrutura do calo do processo do enraizamento dos brotos axilares da Araucaria angustifolia. Estes brotos, em meio básico de Murashigue & Skoog, com a concentração dos nutrientes minerais reduzida à metado 1-2 mg de ácido indol-3-butírico. formam calo rizogênico somente nas regiões muito próximas da base. 0 excedente é do tipo friável, provavelmente dificultando a iniciação radicial. Entretanto. as raízes formadas são morfo e fisiologicamente funcionais. Abstract Anatomical aspects of the callus and the in vitro rooting process on axiliary shoots of Araucaria angustifoia were performed. These shoots cultivated in Murashigue & Skoogs basal medium at the half strength of mineral nutrients and 1-2 mg of indol-3-butyric acid, showed firmly stablished and rhizogenic callus only at the proximal sites of its bases. The excedent were friable callus, probably affecting the root primordia initiation. However, developed roots are phisiologicalty and morphologically functional. Abstract Les aspects anatomiques de la structure du cal et de la rhizogénese in vitro de pousses axillaires dAraucaria angustifolia ont été étudiés. Cés pousses cultivées sur le milieu de Murashigue & Skoog dans une concentration des minéraux réduit a 1/2, plus 1-2 mg de Lacid 3- indolybutirique, forment des cals compacts rhizogénes seulement a la proximité de leurs bases. Lexcedant étaient du tipe friable, possiblement impechent linitiation des racines. Les racines formées sur les cals compacts, sont morphologique et physiologiquement functionelles

Identifying the generic limits of the Cheilanthoid genus Doryopteris

Morphology-based delimitation of genera in the Cheilanthoid ferns has proved to be problematic and understanding of the phylogeny and relationships amongst Cheilanthoid ferns based on morphological characters has posed even further difficulties, owing perhaps in large part to adaptation by many taxa to xeric habitats, as well as convergent evolution. It is only now with the application of DNA sequence data that relationships of species and genera are becoming clear. Here, we present results of cpDNA sequence data from species that have been traditionally placed in the genus Doryopteris and, based on both these results, and morphological and distribution data, this study helps clarify the concept of the genus Doryopteris its position within the Cheilanthoid ferns and the status of Lytoneuron. As a result, three genera are redefined: Doryopteris, Lytoneuron and Ormopteris