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. 1987 Dec;85(4):902–905. doi: 10.1104/pp.85.4.902

Transport and Metabolism of a Sucrose Analog (1′-Fluorosucrose) into Zea mays L. Endosperm without Invertase Hydrolysis 1

Judy Gougler Schmalstig 1,2, William D Hitz 1
PMCID: PMC1054366  PMID: 16665828

Abstract

1′-Fluorosucrose (FS), a sucrose analog resistant to hydrolysis by invertase, was transported from husk leaves into maize (Zea mays L., Pioneer Hybrid 3320) kernels with the same magnitude and kinetics as sucrose. 14C-Label from [14C]FS and [14C]sucrose in separate experiments was distributed similarly between the pedicel, endosperm, and embryo with time. FS passed through maternal tissue and was absorbed intact into the endosperm where it was metabolized and used in synthesis of sucrose and methanol-chloroform-water insolubles. Accumulation of [14C] sucrose from supplied [14C]glucosyl-FS indicated that the glucose moiety from the breakdown of sucrose (here FS), which normally occurs in the process of starch synthesis in maize endosperm, was available to the pool of substrates for resynthesis of sucrose. Uptake of FS into maize endosperm without hydrolysis suggests that despite the presence of invertase in maternal tissues and the hydrolysis of a large percentage of sucrose unloaded from the phloem, hexoses are not specifically needed for uptake into maize endosperm.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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