Folia Horticulturae

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Effect of gibberellic acid on growth, flowering, and seed production in crisphead lettuce (Lactuca sativa L.)

Vjacheslav G. Kochankov*, Elena A. Zhivukhina*, Jan Borkowski**, Ryszard Górecki**, Leszek S. Jankiewicz**

**Institute of Plant Physiology of the Russian Academy of Science
**127276 Moscow, Botanicheskaya 35, Russia
**Research Institute of Vegetable Crops
**Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland

The crisp-head lettuce cultivar Penn Lake was cultivated in pots in a heated greenhouse. Single gibberellin A3 (GA3) application at 6.25 mg dm-3 at the stage of 11 or 20 leaves caused acceleration of the stem formation and favoured early flowering and seed maturation. Seed production per plant was 2-3 times higher than in the intact controls and similar or higher than in decapitated or head-incised controls. The application of GA3 in too high concentrations (12.5 or 25 mg dm-3) caused excessive growth and lodging of the plants, while multiple or too early application (7-leaf stage) produced also morphogenetic disorders such as stem curvatures, secondary head formations, etc. Head incision or decapitation did not significantly increase the seed yield per plant but markedly increased the number of plants which produced seeds.

Kochankov V.G., Zhivukhina E.A., Borkowski J., Górecki R., Jankiewicz L.S., 1996. Effect of gibberellic acid on growth, flowering, and seed production in crisphead lettuce (Lactuca sativa L.). Folia Horticulturae 8/1: 11-18.