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Author Soltani, Bahram M. ♦ Ehlting, Jürgen ♦ Hamberger, Björn ♦ Douglas, Carl J.
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2006
Language English
Subject Keyword Phenylpropanoid ♦ Wounding response ♦ cis element ♦ 4CL gene family
Abstract Lignin is an important biopolymer that is deposited in secondary cell walls of plant cells (e.g., tracheary elements) and in response to stresses such as wounding. Biosynthesis of lignin monomers occurs via the phenylpropanoid pathway, in which the enzyme 4-coumarate:CoA ligase (4CL) plays a key role by catalyzing the formation of hydroxycinnamoyl-CoA esters, subsequently reduced to the corresponding monolignols (hydroxycinnamoyl alcohols). 4CL is encoded by a family of four genes in Arabidopsis thaliana (At4CL1-At4CL4), which are developmentally regulated and co-expressed with other phenylpropanoid genes. We investigated in detail the wound-induced expression of At4CL1-At4CL4, and found that At4CL1 and At4CL2 mRNA accumulation follows biphasic kinetics over a period of 72 h, while At4CL4 expression is rapidly activated for a period of at least 12 h before declining. In order to localize cis-regulatory elements involved in the developmental and wound-induced regulation of the At4CL gene family members, At4CL promoter-beta-glucuronidase (GUS) reporter gene fusions were constructed and transferred into Arabidopsis plants. Analysis of these plants revealed that the promoter fragments direct discrete and distinct patterns of expression, some of which did not recapitulate expected patterns of wound-induced expression. The locations of regulatory elements associated with the At4CL2 gene were investigated in detail using a series of transgenic Arabidopsis plants containing promoter fragments and parts of the transcribed region of the gene fused to GUS. Positive and negative regulatory elements effective in modulating developmental expression or wound responsiveness of the gene were located both in the promoter and transcribed regions of the At4CL2 gene.
ISSN 00320935
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2006-05-23
Publisher Place Berlin/Heidelberg
e-ISSN 14322048
Journal Planta
Volume Number 224
Issue Number 5
Page Count 13
Starting Page 1226
Ending Page 1238


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Source: SpringerLink