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First published online August 29, 2002; 10.1104/pp.004721

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Plant Physiol, September 2002, Vol. 130, pp. 78-89

Effect of Regulated Overexpression of the MADS Domain Factor AGL15 on Flower Senescence and Fruit Maturation1

Su-Chiung Fang2 and Donna E. Fernandez*

Department of Botany, University of Wisconsin, 430 Lincoln Drive, Madison, Wisconsin 53706-1381

We have examined the effect of regulated overexpression of AGL15, a member of the MADS domain family of regulatory factors, on reproductive tissues. Using molecular and physiological markers, we show that constitutive overexpression of AGL15 in Arabidopsis leads to delay and down-regulation of senescence programs in perianth organs and developing fruits and alters the process of seed desiccation. Through genetic crosses, we show that the rate of water loss in the maturing seeds is dictated by the genetic composition and physiological state of the maternal tissue, rather than the embryo. To define the developmental time and/or place when senescence programs are most affected by elevated AGL15 levels, we expressed AGL15 under the control of various promoters. Expression during senescence or in abscission zone cells did not produce delays in floral organ senescence or abscission. Using a glucocorticoid-inducible expression system, we show that an increase in AGL15 levels around the time of flower opening is necessary to delay senescence and increase floral organ longevity.

1 This work was supported by the University of Wisconsin (Madison) Graduate School, by the U.S. Department of Agriculture-National Research Initiative Competitive Grants Program (grant no. 96-35304-3699), and by the Department of Energy/National Science Foundation/U.S. Department of Agriculture Collaborative Program on Research in Plant Biology (grant no. DBI 96-02222).

2 Present address: Section of Cell and Developmental Biology, University of California-San Diego, 9500 Gilman Drive MC0349, La Jolla, CA 92093.

* Corresponding author; e-mail dfernand{at}facstaff.wisc.edu; fax 608-262-7509.

© 2002 American Society of Plant Physiologists


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