EXONIC SEQUENCES ARE REQUIRED FOR ELICITOR AND LIGHT ACTIVATION OF A PLANT DEFENSE GENE, BUT PROMOTER SEQUENCES ARE SUFFICIENT FOR TISSUE SPECIFIC EXPRESSION

被引:73
作者
DOUGLAS, CJ
HAUFFE, KD
ITESMORALES, ME
ELLARD, M
PASZKOWSKI, U
HAHLBROCK, K
DANGL, JL
机构
[1] UNIV BRITISH COLUMBIA,DEPT BOT,VANCOUVER V6T 2B1,BC,CANADA
[2] MAX PLANCK INST ZUCHTUNGSFORSCH,DEPT BIOCHEM,W-5000 COLOGNE 30,GERMANY
关键词
CIS-ACTING ELEMENTS; 4-COUMARATE; COA LIGASE; STRESS INDUCTION; PARSLEY; TRANSGENIC PLANTS;
D O I
10.1002/j.1460-2075.1991.tb07701.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The parsley 4CL-1 gene encodes 4-coumarate:CoA ligase, a key enzyme of general phenylpropanoid metabolism. As well as being transcriptionally activated by such stresses as pathogen infection, UV-irradiation, and wounding, expression of 4CL-1 is developmentally regulated. In this paper we present evidence that 4CL-1 cis-acting elements which control stress-induced and developmental expression are physically separated. The ability of a series of 4CL gene constructions to respond to elicitor and light in stably or transiently transformed parsley cells was tested. While inducible expression was observed from all templates in which the 4CL-1 structural gene was fused to the 4CL-1 promoter, fusions of the promoter to the GUS reporter gene were completely unresponsive. The element(s) required for responsiveness appear to be exonic, since 4CL-1 introns and 3' flanking DNA had no effect on inducibility. Furthermore, this unconventional regulatory mode operates in transgenic tobacco plants, where we show that a 4CL-1 promoter fragment specifies correct cell-specific expression when fused to GUS yet is unresponsive to elicitor and light.
引用
收藏
页码:1767 / 1775
页数:9
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