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THE PLANT CELL, Vol 3, Issue 9 963-972, Copyright © 1991 by American Society of Plant Biologists
Abscisic Acid Mediates Wound Induction but Not Developmental-Specific Expression of the Proteinase Inhibitor II Gene Family
H. Pena-Cortes, L. Willmitzer and J. J. Sanchez-Serrano
Institut fur Genbiologische Forschung Berlin GmbH, Ihnestrasse 63, 1000 Berlin 33, Federal Republic of Germany
The expression of the potato and tomato proteinase inhibitor II (pin2) gene
family is subject to both developmental and environmental control, being
constitutively expressed in potato tubers while only being present in the
foliage of the potato or tomato plants after mechanical damage. There is
evidence that the phytohormone abscisic acid (ABA) is involved in this
wound induction of pin2 gene expression. This paper describes experiments
that demonstrate that ABA is able to induce the expression of the pin2 gene
family, both locally and systemically, at physiological concentrations. The
significance of the ABA involvement in the pin2 induction upon wounding has
been further strengthened by analyzing the expression of a pin2
promoter-[beta]-glucuronidase gene fusion in transgenic ABA-deficient
mutant potato plants. We have analyzed the developmental regulation of pin2
gene expression in wild-type and ABA-deficient potato and tomato plants.
The pin2 mRNA level is identical in mutant and wild-type parental Solanum
phureja tubers. In addition, evidence is presented for pin2 also being
constitutively expressed at certain stages in the development of both
tomato and potato flowers. Again, the ABA deficiency appears to have little
influence in this tissue-specific expression in the mutants. These results
suggest the action of separate pathways for the developmental and
environmental regulation of pin2 gene expression.
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