Academic Journals Database
Disseminating quality controlled scientific knowledge

Fructan variation in the rhizophores of Vernonia herbacea (Vell.) Rusby, as influenced by temperature

ADD TO MY LIST
 
Author(s): DIAS-TAGLIACOZZO GLÁUCIA M. | FIGUEIREDO-RIBEIRO RITA DE CÁSSIA L. | CARVALHO MARIA ANGELA M. | DIETRICH SONIA M. C.

Journal: Revista Brasileira de Botânica
ISSN 0100-8404

Volume: 22;
Issue: suppl.2;
Start page: 267;
Date: 1999;
Original page

Keywords: Asteraceae | fructans | cerrado | low temperatures

ABSTRACT
The influence of climatic variations on fructan content in tropical regions is not well known. The present study deals with the effects of temperature on fructan contents in rhizophores of plants of Vernonia herbacea, a native species from the Brazilian cerrado vegetation. Intact plants and fragmented rhizophores were subjected to different temperatures under natural and controlled environmental conditions. Rhizophores of plants in pre-dormant stage (aerial parts showing some yellowish leaves) presented higher fructan content at 5oC than those kept at 25oC, whereas in dormant plants (aerial parts absent) temperature treatments did not affect fructan contents. Fragmented rhizophores obtained from dormant plants presented higher levels of fructo-polysaccharides at the end of the experiment than at the beginning of the treatment, regardless of the temperature they were stored, whereas fragments obtained from vegetative plants showed a decrease in fructan content under the same treatments. It was concluded that variations observed in fructan contents are related to the phenological state of the plants prior to the treatment rather than to extraneous temperatures they are subjected to during this stage.
Why do you need a reservation system?      Affiliate Program