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Published online on September 19, 2002, 10.1073/pnas.162485999
PNAS | October 1, 2002 | vol. 99 | no. 20 | 13302-13306


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Plant Biology
 A new class of regulatory genes underlying the cause of pear-shaped tomato fruit

Jiping Liu*, Joyce Van Eckdagger , Bin Cong*, and Steven D. Tanksley*,Dagger

* Departments of Plant Breeding and Plant Biology, Cornell University, Ithaca, NY 14853; and dagger  Boyce Thompson Institute for Plant Research, Tower Road, Ithaca, NY 14853

Contributed by Steven D. Tanksley, August 13, 2002

A common, recurring theme in domesticated plants is the occurrence of pear-shaped fruit. A major quantitative trait locus (termed ovate) controlling the transition from round to pear-shaped fruit has been cloned from tomato. OVATE is expressed early in flower and fruit development and encodes a previously uncharacterized, hydrophilic protein with a putative bipartite nuclear localization signal, Von Willebrand factor type C domains, and an approx 70-aa C-terminal domain conserved in tomato, Arabidopsis, and rice. A single mutation, leading to a premature stop codon, causes the transition of tomato fruit from round- to pear-shaped. Moreover, ectopic, transgenic expression of OVATE unevenly reduces the size of floral organs and leaflets, suggesting that OVATE represents a previously uncharacterized class of negative regulatory proteins important in plant development.

Dagger To whom reprint requests should be addressed. E-mail: sdt4{at}cornell.edu.

www.pnas.org/cgi/doi/10.1073/pnas.162485999
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