NDLI: Sucrose Regulates Elongation of Carrot Somatic Embryo Radicles as a Signal Molecule

Content Provider	Springer Nature Link
Author	Yang, Zhipan Zhang, Lei Diao, Fengqiu Huang, Meijuan Wu, Naihu
Copyright Year	2004
Abstract	Elongation of carrot somatic embryo radicles was inhibited by sucrose at or above 5%(145 mM). This effect would not be released until the sucrose concentration was lowered again. Morphological and cytological studies as well as determination of ABA content and analysis of the expression mode of a Lea gene, all point to its similarity to natural dormancy and germination of seeds. Use of monosaccharides (glucose and fructose), other disaccharide (maltose), and isomolar concentration of osmotica (mannitol and sorbitol), did not show similar regulatory effect. It is thus clear that the regulatory effect is not a result of simple osmotic stress. Hexokinase inhibitors such as glucosamine and N-acetyl-glucosamine did not exert any influence on the regulation–deregulation effects of sucrose. Mannose, which inhibits germination of Arabidopsis seeds, did not prevent carrot somatic embryo radicles from elongating. It is thus inferred that this sucrose-signaling pathway may be independent of hexokinase. As a first step to understand the molecular mechanism of this process, a carrot sucrose transporter gene (cSUT) expressed in the embryos and roots specifically was isolated. Studies on transformed yeast mutant with cSUT cDNA identified its sucrose transport activity. Northern hybridization and gel retardation experiment revealed that there is a marked increase in expression of cSUT at the beginning of somatic embryo germination, and this is attributed to regulation on the level of transcription. This suggested the possibility that cSUT has an important role in this sucrose signal regulation system.
Starting Page	441
Ending Page	459
Page Count	19
File Format	PDF
ISSN	01674412
Journal	Plant Molecular Biology
Volume Number	54
Issue Number	3
e-ISSN	15735028
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochemistry Plant Sciences Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Agronomy and Crop Science

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