THE PLANT CELL, Vol 7, Issue 10 1569-1582, Copyright © 1995 by American Society of Plant Biologists

RESEARCH ARTICLES

A Novel Class of MADS Box Genes Is Involved in Ovule Development in Petunia

G. C. Angenent, J. Franken, M. Busscher, A. van Dijken, J. L. van Went, HJM. Dons and A. J. van Tunen
Department of Developmental Biology, DLO-Centre for Plant Breeding and Reproduction Research, CPRO-DLO, P.O. Box 16, 6700 AA Wageningen, The Netherlands

We isolated and characterized two ovule-specific MADS box cDNAs from petunia, designated floral binding protein (fbp) genes 7 and 11. The putative protein products of these genes have ~90% of their overall amino acid sequence in common. In situ RNA hybridization experiments revealed that both genes are expressed in the center of the developing gynoecium before ovule primordia are visible. At later developmental stages, hybridization signals were observed only in the ovules, suggesting that these genes are involved in ovule formation. To test this hypothesis, we raised transgenic petunia plants in which both fbp7 and fbp11 expression was inhibited by cosuppression. In the ovary of these transformants, spaghetti-shaped structures developed in positions normally occupied by ovules. These abnormal structures morphologically and functionally resemble style and stigma tissues. Our results show that these MADS box genes belong to a new class of MADS box genes involved in proper ovule development in petunia.

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