In recent work the effect of 5-aminolevulinic-acid (ALA) agent (commercial name Pentakeep-V) was examined on the chlorophyll content, growth and development of Saintpaulia ionantha. The newly re-rooted potted plants were irrigated or sprayed with 0.3‰ or 0.5‰ Pentakeep-V solution, and plus 30% long lasting fertilizer was added to half of th...e all treatments. Control plants were sprayed with tap water. Best result were obtained on the field of flowering. All the treatments promoted chlorophyll-content in the leaves especially spraying with 0.3‰concentration. Plants treated with Pentakeep-V in both concentrations and independently from the spraying or irrigation flowered more than two weeks earlier than control and those that got plus 30% fertilizer. Besides in the case of some treatments the diameter of leaf rosette, the number and surface size of leaves grew comparing to the control. The longlasting fertilizer had positive effect on the fresh weight but none of treatments had effect on the dry weight.
The effect of 1-MCP on rose cultivar 'Bordeaux ' was studied in combination with different preservative solutions. The flowers were treated with 1-MCP for 6 hours at 17 °C and for 18 hours at 4 °C. As for the diameter of flowers the best resu lts was achieved, when applying 20 gL- 1 sucrose + Clorox (2 ml L- 1), as well as preservative "Sprin...g" ( I 0 gL-1) + 1-MCP ( 18 hours). Similar results were measured in the case of Spring + Clorox + 20 gL-1 sucrose with 1-MCP (6 and 18 hours). The longer MCP treatm ent gave better results as compared to the shorter ones, because the flowers were much more open.The condition of flowers was the best in the solution of Clorox + 20 gL-1 sucrose and Spring solution combined with the longer MCP treatment. and Clorox + 20 gL- 1, on the IQ1h day. The longest vase life ( 10,3 day) was observed in the case of Spring application combined with 18 hours of MCP treatment. ln this treatment the vase life was prolonged by 3,3 days. As regards the calculated ornamental values, the following sequence could be established :"Spring" + l-MCP ( 18hrs) 134 points, Clorox + 20 gL-1 sucrose + 1-MCP (l8h) with 129 point, and the third was the Clorox + 20 gL-1 sucrose with 1 19 point.