Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea

Brazilian Archives of Biology and Technology

Gláucia M. Dias-tagliacozzo²  Nair M. Itaya¹  M. Angela Machado De Carvalho¹  Rita De Cássia L. Figueiredo-ribeiro¹  Sonia M. C. Dietrich¹ 

[1] ,Instituto Agronômico de Campinas Centro de Horticultura Campinas SP ,Brazil

关键词: Inulin;    environmental stresses;    drought;    fructan metabolism;    reserve organs;    Asteraceae;   

DOI  :  10.1590/S1516-89132004000300005

来源: SciELO

【 摘 要 】

In order to evaluate the involvement of fructans in drought tolerance, experiments were conducted using intact plants and excised rhizophores of Vernonia herbacea. The water content in rhizophores of intact plants was maintained for 30 days when plants were watered every 7 and 15 days, whereas plants remained alive up to 60 days without water. Total fructan, oligo- to polysaccharides ratio and mean molecular mass of polysaccharides increased in these plants indicating depolymerization of median size molecules. In apical fragments of rhizophores kept dry the oligosaccharides increased in relation to polysaccharides one day after excision in treated tissues. This was reflected in the HPLC profile of the oligosaccharides in which the proportion of free fructose and fructans with DP 4-10 increased markedly. Results indicate that fructan metabolism is involved in drought tolerance of V. herbacea.

【 授权许可】

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