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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. As relações entre variação nos conteúdos de frutanos e a variação nas condições climáticas e edáficas em regiões tropicais são pouco conhecidas. O objetivo deste trabalho foi investigar o efeito da temperatura no conteúdo e composição dos frutanos presentes em rizóforos de Vernonia herbacea, uma planta nativa do cerrado brasileiro. Plantas intactas e fragmentos de rizóforos foram submetidos a diferentes temperaturas. Ao final do tratamento de frio (5oC) plantas intactas em início de dormência (parte aérea presente) apresentaram conteúdo de frutanos maior que o das plantas mantidas a 25oC. Plantas completamente dormentes (sem a parte aérea) apresentaram poucas diferenças no conteúdo de frutanos quando mantidas a 5 ou 25oC. Independentemente da temperatura utilizada, fragmentos de rizóforos, isolados de plantas em fase de dormência, apresentaram ao final do experimento um aumento no conteúdo de polifrutanos em relação ao início do tratamento; no entanto, fragmentos isolados de plantas em fase de brotação apresentaram diminuição no conteúdo de polifrutanos. Concluiu-se que as variações observadas estão mais relacionadas com o estádio fenológico da planta do que com o tratamento de temperatura

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