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THE PLANT CELL, Vol 6, Issue 9 1227-1239, Copyright © 1994 by American Society of Plant Biologists
Pistil-Specific and Ethylene-Regulated Expression of 1-Aminocyclopropane-1-Carboxylate Oxidase Genes in Petunia Flowers
X. Tang, AMTR. Gomes, A. Bhatia and W. R. Woodson
Department of Horticulture, Purdue University, West Lafayette, Indiana 47907-1165
The differential expression of the petunia
1-aminocyclopropane-1-carboxylate (ACC) oxidase gene family during flower
development and senescence was investigated. ACC oxidase catalyzes the
conversion of ACC to ethylene. The increase in ethylene production by
petunia corollas during senescence was preceded by increased ACC oxidase
mRNA and enzyme activity. Treatment of flowers with ethylene led to an
increase in ethylene production, ACC oxidase mRNA, and ACC oxidase activity
in corollas. In contrast, leaves did not exhibit increased ethylene
production or ACC oxidase expression in response to ethylene. Gene-specific
probes revealed that the ACO1 gene was expressed specifically in senescing
corollas and in other floral organs following exposure to ethylene. The
ACO3 and ACO4 genes were specifically expressed in developing pistil
tissue. In situ hybridization experiments revealed that ACC oxidase mRNAs
were specifically localized to the secretory cells of the stigma and the
connective tissue of the receptacle, including the nectaries. Treatment of
flower buds with ethylene led to patterns of ACC oxidase gene expression
spatially distinct from the patterns observed during development. The
timing and tissue specificity of ACC oxidase expression during pistil
development were paralleled by physiological processes associated with
reproduction, including nectar secretion, accumulation of stigmatic
exudate, and development of the self-incompatible response.
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