NAA-induced ethylene evolution by plum flowers and fruitlets
Aleksander Gonkiewicz, Kazimierz Nosal
Department of Pomology
Agricultural University in Kraków
29 Listopada 54, 31-425 Kraków, Poland
Six-year-old plum trees ‘Stanley’ were sprayed with a solution of NAA potassium salt. The treatments
were conducted at two dates on two groups of trees. The first treatment was carried out by the end of the blooming
period after flower fertilization. An additional indicator of the treatment at that time was the falling off petals
and a distinctly visible abscission zone between the floral tube and the pedicle. The applied NAA concentrations
varied from 30 to 80 mg l-1. The second treatment was conducted about 10 days
later. In all treatments of the experiment an increase in the evolution of ethylene by flowers and plum fruitlets
was recorded already on the second day after spraying. In the three years of the investigation the most intense
and prolonged ethylene evolution was noted after the first NAA treatment. A significant effect of weather
conditions and years on the intensity of ethylene evolution by plum flowers and fruitlets was noticed.
Gonkiewicz A., Nosal K., 2006. NAA-induced ethylene evolution by plum flowers and fruitlets. Folia
Horticulturae 18/1: 63-72.