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Plant Physiol, February 2000, Vol. 122, pp. 527-534
Auxin-Regulated Genes Encoding Cell Wall-Modifying
Proteins Are Expressed during Early Tomato Fruit Growth
Carmen
Catalá,1
Jocelyn K.C.
Rose,1 and
Alan B.
Bennett*
Mann Laboratory, Department of Vegetable Crops, University of
California, Davis, California 95616.
An expansin gene,
LeExp2, was isolated from auxin-treated, etiolated
tomato (Lycopersicon esculentum cv T5) hypocotyls.
LeExp2 mRNA expression was restricted to the growing
regions of the tomato hypocotyl and was up-regulated during incubation
of hypocotyl segments with auxin. The pattern of expression of
LeExp2 was also studied during tomato fruit growth, a
developmental process involving rapid cell enlargement. The expression
of genes encoding a xyloglucan endotransglycosylase
(LeEXT1) and an endo-1,4- -glucanase
(Cel7), which, like LeExp2, are
auxin-regulated in etiolated hypocotyls (C. Catalá, J.K.C. Rose,
A.B. Bennett [1997] Plant J 12: 417-426), was also studied to
examine the potential for synergistic action with expansins.
LeExp2 and LeEXT1 genes were coordinately
regulated, with their mRNA accumulation peaking during the stages
of highest growth, while Cel7 mRNA abundance increased
and remained constant during later stages of fruit growth. The
expression of LeExp2, LeEXT1, and
Cel7 was undetectable or negligible at the onset of and
during fruit ripening, which is consistent with a specific role of
these genes in regulating cell wall loosening during fruit growth, not
in ripening-associated cell wall disassembly.
1
Present address: Complex Carbohydrate Research
Center and Department of Biochemistry and Molecular Biology, University
of Georgia, 220 Riverbend Road, Athens, GA 30602-4712.
*
Corresponding author; e-mail abbennett{at}ucdavis.edu; fax
530-752-4552.
© 2000 American Society of Plant Physiologists
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