The Enclosed and Exposed Part of the Peduncle of Wheat (Triticum aestivum): Spatial Separation of Fructan Storage

• Although fructan accumulation is reported in photosynthetically active organs, the long-term storage of fructan mainly occurs in more heterotrophic tissues. Significant amounts of fructan are stored in the internodes during grain filling of wheat (Triticum aestivum). The uppermost internode (pedun...

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Bibliographic Details
Published in:The New phytologist 2003-07, Vol.159 (1), p.245-252
Main Author: Gebbing, Thomas
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
diurnal
Economic plant physiology
Filling period
Flag leaf
Flowering
fructan
Fructans
Fructification and ripening
Fructification, ripening. Postharvest physiology
Fundamental and applied biological sciences. Psychology
grain filling
Growth and development
Internodes
Leaves
mobilization
Peduncle
Photophase
Plant physiology
Plant physiology and development
Plants
reserves
sucrose
Triticum aestivum (wheat)
Vegetative and sexual reproduction, floral biology, fructification
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Summary:• Although fructan accumulation is reported in photosynthetically active organs, the long-term storage of fructan mainly occurs in more heterotrophic tissues. Significant amounts of fructan are stored in the internodes during grain filling of wheat (Triticum aestivum). The uppermost internode (peduncle) of wheat consists of a lower unexposed (i.e. enclosed by the flag leaf sheath and thus heterotrophic part, Pl) and an upper exposed autotrophic part ( Pu). • Diurnal and long-term changes of fructan and sucrose (the precursor of fructan synthesis) contents were studied in Pl and Pu of potted wheat plants. • At mid grain-filling the sucrose concentration in Pu increased almost threefold during the light period and decreased in the following night. Diurnal changes in sucrose concentration were much less expressed in Pl. Fructan concentration was significantly higher in Pl than in Pu and did not change during the light period. • In another experiment, field grown wheat plants were sampled at regular intervals between 5 d before anthesis and grain maturity. At the time of maximum fructan content, 88% of the fructans in the total peduncle were stored in the heterotrophic Pl. Within Pl, fructan accumulation started in the older segments. The reason for the sharp separation of fructan storage between Pl and Pu remains unclear.
ISSN:0028-646X
1469-8137
DOI:10.1046/j.1469-8137.2003.00799.x