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Abstract Detail

Developmental and Structural Section

Appezzato-da-Glória, Beatriz [1], Hayashi, Adriana Hissae [2], Oliveira, Tuane Santos de [3], Silva, Edilmara Michelly Souza da [3], Bombo, Aline Bertolosi [4].

New anatomical features of underground organs of Aldama species (Heliantheae, Asteraceae) from Brazilian Cerrado.

Asteraceae has the most species represented in the Brazilian Cerrado (neotropical savanna) after the Leguminosae. Asteraceae species from both woody and herbaceous strata of this Biome have thick underground bud-bearing organs that accumulate carbohydrates,reinforcing the adaptive strategy of these plants to fire and dry periods. Our research group is carrying out a thematic project with Brazilian Aldama species that are endemic to the Cerrado. The genus was chosen since it has complex taxonomic classification and problems of species delimitation. The species examined in the present study were: Aldama arenaria (Baker) E. E. Schill. & Panero, Aldama filifolia (Sch. Bip. ex Baker) E.E.Schill. & Panero, Aldama kunthiana (Gardner) E. E. Schill. & Panero, Aldama linearifolia (Chodat) E. E. Schill. & Panero, Aldama robusta (Gardner) E. E. Schill. & Panero, Aldama tenuifolia (Gardner) E. E. Schill. & Panero and Aldama trichophylla (Dusen) Magenta. All species exhibit seasonal development that involves the formation of aerial branches from underground buds during the flowering phase. These branches senesce during the dormancy period, and only the underground organs remain. These organs are woody xylopodia from which tuberous adventitious roots emerge. The xylopodium occurs in the superficial layers of the soil and has several axillary buds at the base of branches grown during favorable periods of development. Gradually, these branches merge in a self-grafting process that is responsible for the complex structure of the xylopodium. The coating tissue of the xylopodia and tuberous roots consists of some layers of suberized walled cells originated from periclinal division of the outer cells in the cortex, resembling the stratified cork reported for monocotyledonous. The tuberization process observed in all adventitious roots is due mainly to the divisions of the cells of the medullary zone, with little contribution of the vascular cambium except for Aldama tenuifolia. There are internal secretory spaces in the cortex and pith of all studied species. Inulin-type fructans are observed inside the parenchyma cells, tracheary elements and in the lume of secretory canals. The coating tissue of the underground organs and the tuberization process of the adventitious roots of the studied species were described for the first time for Asteraceae species.

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Related Links:
Asteraceae Thematic Project

1 - University of Sao Paulo, Biological Sciences , 11 Padua Dias Avenue, Piracicaba, SP, 13418900, Brasil
2 - Institute of Botany, Center for Research in Anatomy, Av. Miguel Stéfano, 3687, São Paulo, São Paulo, 04301-902, Brazil
3 - University of Sao Paulo, Biological Sciences, Av Padua Dias 11, Piracicaba, SP, 13418900, Brasil
4 - University of Sao Paulo, 11 Padua Dias Avenue, Piracicaba, SP, 13418900, Brasil

tuberous roots
secretory spaces

Presentation Type: Poster:Posters for Sections
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PDS003
Abstract ID:126
Candidate for Awards:Katherine Esau Award

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