Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea
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 plant...
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Instituto de Tecnologia do Paraná (Tecpar)
2004-07-01
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doaj-10eda6fab70e419c80bdb01702ad36f62020-11-24T23:32:20ZengInstituto de Tecnologia do Paraná (Tecpar)Brazilian Archives of Biology and Technology1516-89131678-43242004-07-0147336337310.1590/S1516-89132004000300005Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbaceaGláucia M. Dias-TagliacozzoNair M. ItayaM. Angela Machado de CarvalhoRita de Cássia L. Figueiredo-RibeiroSonia M. C. DietrichIn 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.<br>A vegetação herbácea do cerrado brasileiro apresenta sistemas subterrâneos ricos em frutanos e estacionalmente expostos à restrição hídrica. A fim de avaliar o envolvimento dos frutanos na tolerância à dessecação foram conduzidos experimentos utilizando plantas intactas e fragmentos de rizóforos de Vernonia herbacea. O conteúdo de água nos rizóforos de plantas intactas foi mantido por 30 dias, quando as plantas foram molhadas a cada 7 ou 15 dias, sendo que as plantas permaneceram vivas até 60 dias sem água. O conteúdo total de frutanos, a razão oligo/polissacarídeos e a massa molecular média dos polissacarídeos nessas plantas aumentaram, indicando haver ocorrido despolimerização de moléculas com tamanho intermediário das cadeias. Nos fragmentos apicais de rizóforos submetidos à dessecação, os oligossacarídeos aumentaram em relação aos polissacarídeos, um dia após a excisão dos tecidos tratados. Essas alterações foram facilmente detectadas através dos perfis de oligossacarídeos analisados por HPLC, nos quais a proporção de frutose livre e de frutanos com GP 4 - 10 aumentou acentuadamente. Os resultados indicam que o metabolismo de frutanos está envolvido na tolerância à dessecação de Vernonia herbacea.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300005Inulinenvironmental stressesdroughtfructan metabolismreserve organsAsteraceae |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Gláucia M. Dias-Tagliacozzo Nair M. Itaya M. Angela Machado de Carvalho Rita de Cássia L. Figueiredo-Ribeiro Sonia M. C. Dietrich |
spellingShingle |
Gláucia M. Dias-Tagliacozzo Nair M. Itaya M. Angela Machado de Carvalho Rita de Cássia L. Figueiredo-Ribeiro Sonia M. C. Dietrich Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea Brazilian Archives of Biology and Technology Inulin environmental stresses drought fructan metabolism reserve organs Asteraceae |
author_facet |
Gláucia M. Dias-Tagliacozzo Nair M. Itaya M. Angela Machado de Carvalho Rita de Cássia L. Figueiredo-Ribeiro Sonia M. C. Dietrich |
author_sort |
Gláucia M. Dias-Tagliacozzo |
title |
Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea |
title_short |
Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea |
title_full |
Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea |
title_fullStr |
Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea |
title_full_unstemmed |
Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea |
title_sort |
fructans and water suppression on intact and fragmented rhizophores of vernonia herbacea |
publisher |
Instituto de Tecnologia do Paraná (Tecpar) |
series |
Brazilian Archives of Biology and Technology |
issn |
1516-8913 1678-4324 |
publishDate |
2004-07-01 |
description |
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.<br>A vegetação herbácea do cerrado brasileiro apresenta sistemas subterrâneos ricos em frutanos e estacionalmente expostos à restrição hídrica. A fim de avaliar o envolvimento dos frutanos na tolerância à dessecação foram conduzidos experimentos utilizando plantas intactas e fragmentos de rizóforos de Vernonia herbacea. O conteúdo de água nos rizóforos de plantas intactas foi mantido por 30 dias, quando as plantas foram molhadas a cada 7 ou 15 dias, sendo que as plantas permaneceram vivas até 60 dias sem água. O conteúdo total de frutanos, a razão oligo/polissacarídeos e a massa molecular média dos polissacarídeos nessas plantas aumentaram, indicando haver ocorrido despolimerização de moléculas com tamanho intermediário das cadeias. Nos fragmentos apicais de rizóforos submetidos à dessecação, os oligossacarídeos aumentaram em relação aos polissacarídeos, um dia após a excisão dos tecidos tratados. Essas alterações foram facilmente detectadas através dos perfis de oligossacarídeos analisados por HPLC, nos quais a proporção de frutose livre e de frutanos com GP 4 - 10 aumentou acentuadamente. Os resultados indicam que o metabolismo de frutanos está envolvido na tolerância à dessecação de Vernonia herbacea. |
topic |
Inulin environmental stresses drought fructan metabolism reserve organs Asteraceae |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300005 |
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