NDLI: Regulation of α-galactosidase gene expression in primary foliage leaves of barley (Hordeum vulgare L.) during dark-induced senescence

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Regulation of α-galactosidase gene expression in primary foliage leaves of barley (Hordeum vulgare L.) during dark-induced senescence

Content Provider	Springer Nature Link
Author	Chrost, Bozena Daniel, Annekatrin Krupinska, Karin
Copyright Year	2004
Abstract	α-Galactosidase activity (α-d-galactoside galactohydrolase, EC 3.2.1.22) increased during dark-induced senescence in primary foliage leaves of barley (Hordeum vulgare L. cv. Steffi). The changes in activity were accompanied by parallel changes in expression of the HvSF11 gene encoding a putative α-galactosidase. The transcript level of HvSF23 encoding a second putative α-galactosidase stayed constant during leaf senescence. Both α-galactosidase activity and the level of the HvSF11 transcript decreased after exogenous application of sucrose and glucose to detached dark-incubated leaves. In contrast, the HvSF23 transcript level was not influenced by sugars. Application of glucose analogs to detached and dark-incubated leaves revealed that phosphorylation of hexose by hexokinase modulates both the α-galactosidase activity and the expression of HvSF11. These results indicate that the expression of the genes coding for two α-galactosidase isoenzymes is regulated by different signalling pathways, suggesting different functions for the two gene products.
Starting Page	886
Ending Page	889
Page Count	4
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	218
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-12-03
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	α-Galactosidase (enzymes, cDNAs) Hordeum Leaf senescence (barley) foliage leaves Sugar-mediated gene repression (hexokinase)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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