Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Published on March 2, 2007; 10.1104/pp.106.095232

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Received December 23, 2006
Accepted February 16, 2007

Auxin Synthesis-encoding Transgene Enhances Grape Fecundity

Elisa Costantini , Lucia Landi , Oriana Silvestroni , Tiziana Pandolfini , Angelo Spena , and Bruno Mezzetti *

Dipartimento Scienze Ambientali e delle Produzioni Vegetali, Marche Polytechnic University, Via Brecce Bianche 60131 - Ancona (IT); Dipartimento Scientifico Tecnologico Facoltà di Scienze. Strada le Grazie,15, 37134 Verona (IT)

* Corresponding author; email: b.mezzetti{at}univpm.it.

Grape (Vitis vinifera) yield is largely dependent on the fecundity of the cultivar. The average number of inflorescences per shoot (i.e. shoot fruitfulness) is a trait related to fecundity of each grapevine. Berry number and weight per bunch is another feature affecting grape yield. An ovule-specific auxin-synthesising (DefH9-iaaM) transgene that increases the IAA content of grape transgenic berries was transformed into cultivars Silcora and Thompson Seedless, which differ in the average number of inflorescences per shoots. Thompson Seedless naturally has very low shoot fruitfulness whereas Silcora has medium shoot fruitfulness. The average number of inflorescences per shoot in DefH9-iaaM Thompson Seedless was doubled compared to its wild type control. Berry number per bunch was increased in both transgenic cultivars. The quality and nutritional value of transgenic berries was substantially equivalent to their control fruits. The data presented indicate that auxin enhances fecundity in grapes, thus enabling to increase yield with lower production costs.






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