Climatic seasonality has an infl uence on the phenology of native Cerrado plants. Herbs and subshrubs tend to fl ower in the rainy season, although some species of these habits fl ower in the dry season. Reserve carbohydrates, stored in the underground organs, are used to support phases of high energy-demand, but also may protect plants from damage during periods of environmental limitation. In this study we evaluated variation in fructan levels in the underground organs of fi eld-grown plants of Chresta exsucca among diff erent phenological phases. Chresta exsucca fl owers in the dry season and possesses a diff use underground system, which stores inulin-type fructans. Resprouting was continual during the sampling period. Oligosaccharide content was always higher than polysaccharide content, except during senescence, the only phase with an oligosaccharide: polysaccharide ratio < 1. Fructan accumulation occurred during vegetative growth until fl owering. Fructan mobilization was prominent during resprouting until the beginning of vegetative growth. Fructans stored in the underground organs of C. exsucca serve to fulfi ll the energetic demands of development and maintenance of this complex structure. In this way, fructans are essential to the persistence of this species in the environment of the Cerrado by ensuring reproduction in harsh conditions, such as drought.
A Espada de São Jorge e uma planta amplamente cultivada como ornamental pertencente a família Asparagaceae. As espécies dessa família frequentemente apresentam rizomas como órgãos de armazenamento e os principais carboidratos não estruturais armazenados são os frutanos. Estes compostos são polímeros de frutose derivados de sacarose. Devido aos seus inúmeros benefícios, são de grande interesse a indústria alimentícia e farmacêutica. Objetivou-se com esse trabalho quantificar os teores de carboidratos não estruturais e verificar a presença de frutanos em rizomas e raízes de Espada de São Jorge. Para isso, foram coletados na estação seca os órgãos subterrâneos de plantas cultivadas em um canteiro, mas que não são irrigadas. Foram avaliados o conteúdo de agua e o teor de carboidratos solúveis em ambos os órgãos. Os rizomas da espécie apresentaram maior conteúdo de agua e maior teor de carboidratos solúveis que as raízes. Por analises qualitativas dos carboidratos solúveis por cromatografia de troca aniônica de alto desempenho, verificou-se a presença de frutanos em ambos os órgãos, com perfil semelhante ao observado em extratos de bulbos de cebola. Concluímos que os órgãos subterrâneos de Espada de São Jorge armazenam frutanos com estruturas diversificadas que correspondem a neosserie da inulina e que, especialmente os rizomas da Espada de São Jorge são fonte promissora para a obtenção de frutanos.
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