Sucrose and fructan metabolism of different wheat cultivars at chilling temperatures

Tognetti, Jorge Alberto; Salerno, Graciela L.; Crespi, M. D.; Pontis, Horacio G.

doi:10.1034/j.1399-3054.1990.780409.x

Cited by 48 publications

(62 citation statements)

References 9 publications

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“…The DP of fructooligosaccharides in young vegetative wheat seedlings is low (Fig. 4) as described by Bancal & Gaudillere (1989) and Tognetti et al (1990).…”

Section: Resultsmentioning

confidence: 99%

“…The lack of phosphorylated substrate causes a retarded glycolysis in spite of Numerous studies provide direct or indirect evidence linking fructan metabolism to environmental stress (Archbold, 1938;Hendry, 1987;Pollock & Cairns, 1991). The relationship between fructans and the response of plants to low temperature has often been described (Wagner, Wiemken & Matile, 1986;Tognetti et al, 1990). However, whether fructans are directly involved in the mechanism of cold adaptation is still debatable because their accumulation may be the result of an increased content of sucrose for very difTerent reasons (Wagner, Keller & Wiemken, 1983;Cairns & Pollock, 1988).…”

Section: Discussionmentioning

confidence: 99%

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Fructan content of wheat seedlings(Triticum aestivumL.) under hypoxia and following re‐aeration

et al. 1993

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SUMMARYWe studied fructan accumulation in wheat seedlings {Triticum aestivum L. cv, Alcedo) caused by oxygen shortage around the root. Plants were cultivated in either nitrogen-Hushed or aerated nutrient solution. In response to the nitrogen treatment there was an accumulation of soluble carbohydrates in shoots as well as in roots. The main contribution was due to fructans. The content of fructo-oligosaccharides had been increased five-fold in the roots and seven-fold in the shoots. This is incompatible with the assumption that higher substrate consumption follows enhanced fermentation under oxygen shortage. Re-aeration of the nitrogen-fiushed nutrient solution resulted in enhanced consumption of stored carbohydrates, mainly of fructans, accompanied by high growth rates of the roots. The possibility of utilizing fructans quickly if oxygen is available is a possible advantage for plants adapted to hypoxia. Particularly however, it is suggested that the low energy requirements for sucrose: sucrose fructosyltransferase, allowing fructan synthesis even under oxygen shortage, may improve the fitness of plants to survive temporary hypoxia in the rhizosphere.

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“…The DP of fructooligosaccharides in young vegetative wheat seedlings is low (Fig. 4) as described by Bancal & Gaudillere (1989) and Tognetti et al (1990).…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Fructan content of wheat seedlings(Triticum aestivumL.) under hypoxia and following re‐aeration

et al. 1993

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“…This seems to be a consequence of the increase of sucrose possibly due to the enhancement of the activity of sucrose synthesizing enzymes at low temperature. Indeed, in wheat it was observed that sucrose phosphate synthase and sucrose synthase increase in plants stored at low temperatures (Calderon & Pontis 1985, Salerno et al 1989, Tognetti et al1989, 1990.…”

Section: Resultsmentioning

confidence: 99%

“…Also, several species of Asteraceae, as exemplified by chicory (Cichorium intybus L.), accumulate fructans of low degree of polymerization (DP) when exposed to chilling temperatures ( Van den Ende et al 1996). However, Tognetti et al (1990) pointed out that the role of fructan in cold acclimation remains an open question since its accumulation seems to be the result of sucrose accumulation (Wagner et al 1983, Cairns & Pollock 1988, Pollock & Cairns 1991 rather than the low temperature per se.…”

Section: Introductionmentioning

confidence: 99%

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

Dias-Tagliacozzo¹,

Figueiredo-Ribeiro²,

Carvalho³

et al. 1999

Rev. bras. Bot.

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(recebido em 07/11/98; aceito em 24/03/99) ABSTRACT -(Fructan variation in the rhizophores of Vernonia herbacea (Vell.) Rusby, as influenced by temperature). 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 5 o C than those kept at 25 o C, 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. RESUMO -(Variações nos frutanos de rizóforos deVernonia herbacea (Vell.) Rusby, em função da temperatura). 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 (5 o C) plantas intactas em início de dormência (parte aérea presente) apresentaram conteúdo de frutanos maior que o das plantas mantidas a 25 o C. Plantas completamente dormentes (sem a parte aérea) apresentaram poucas diferenças no conteúdo de frutanos quando mantidas a 5 ou 25 o C. 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.

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“…Carbohydrates were extracted in boiling alkaline water as previously reported (Tognetti et al, 1990), except that dry tissue was used. Bound fructose was determined by the TBA method.…”

Section: Extraction and Determination Of Sugarsmentioning

confidence: 99%

Fructan metabolism in two species of Bromus subjected to chilling and water stress

1997

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SUMMARYTwo species of Bromus adapted to different climatic conditions were studied to determine their responses to chilling and water stress. Enzymes of sucrose and fructan metabolism as well as fructoside content were measured in roots and shoots. The results indicate that Bromuspictus (adapted to a cold desert area) has a constitutive fructan synthesis, whilst B. auleticiis (adapted to a warmer northern climate) only accumulated fructan under cold stress. Microscopic observations of roots exposed to fluorescent probes ascertained cell viability and showed that the apex of roots in the northern species were more affected by the water-deficit treatment than the southern species. The presence of fructans in B. pictus and their absence in B. auleticus support the hypothesis that fructans play a role in plant tolerance to environmental stress.

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Sucrose and fructan metabolism of different wheat cultivars at chilling temperatures

Cited by 48 publications

References 9 publications

Fructan content of wheat seedlings(Triticum aestivumL.) under hypoxia and following re‐aeration

Fructan content of wheat seedlings(Triticum aestivumL.) under hypoxia and following re‐aeration

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

Fructan metabolism in two species of Bromus subjected to chilling and water stress

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