Impaired Wound Induction of 3-Deoxy-D-arabino-heptulosonate-7-phosphate (DAHP) Synthase and Altered Stem Development in Transgenic Potato Plants Expressing a DAHP Synthase Antisense Construct

Overview

Journal Plant Physiol

Specialty Physiology

Date 1995 Aug 1

PMID 12228551

Citations 9

Authors

J D Jones

J M Henstrand

A K Handa

K M Herrmann

S C Weller

Affiliations

Soon will be listed here.

Abstract

Potato (Solanum tuberosum L.) cells were transformed with an antisense DNA construct encoding part of 3-deoxy-D-arabino-heptulosonate-7-phosphate (DAHP) synthase (EC 4.1.2.15), the first enzyme of the shikimate pathway, to examine the role(s) of this protein in plant growth and development. Chimeric DNA constructs contained the transcript start site, the first exon, and part of the first intron of the shkA gene in antisense or sense orientations under the control of the cauliflower mosaic virus 35S promoter. Some, but not all, of the transgenic plants expressing antisense DAHP synthase RNA showed reduced levels of wound-induced DAHP synthase enzyme activity, polypeptide, and mRNA 12 and 24 h after wounding. No alteration in the wound induction of DAHP synthase gene expression was observed in transgenic potato tubers containing the chimeric sense construct. Reduced steady-state levels of DAHP synthase mRNA were observed in stem and shoot tip tissue. Some plants with the chimeric antisense construct had reduced stem length, stem diameter, and reduced stem lignification.

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