Abstract. The research was carried out to establish the influence of Chrysal Clear, different GA₃, BA concentrations and methods of application on postharvest durability of cut stalks Eucalyptus globulus, E. gunnii and E. niphophila cultivated for florist greens. Also the influence of these compounds and preparation, which the tested species were treated with, on the loss of their fresh weight was observed. The research showed negative influence of all of these bioregulators on the postharvest durability of the tested eucalyptus stalks.

The influence of GA₃, BA solutions and Chrysal Clear
on the postharvest durability for florist greens
of eucalyptus tested species

Summary

Nowadays, the most popular bioregulators prolonging florist greens durability are gibberellins and cytokinins. The research was carried out to establish the influence of Chrysal Clear, different GA₃, BA concentrations and methods of application on postharvest durability of cut E. globulus, E. gunnii and E. niphophila stalks.

The stalks received the following treatment: conditioning – immersing the stalks for 24 hours in GA₃ solution (0.25 mM·dm^-3); dipping the whole stalks for 30 seconds in GA₃ solution (1 mM·dm^-3); conditioning for 24 hours in BA solution (0.1 mM·dm^-3); dipping for 30 seconds in BA solution (1 mM·dm^-3).

E. niphophila stalks durability was the longest (both in cases of GA₃, BA conditioning and dipping). Also E. gunnii stalks durability (which were put into distilled water) is about 20 days. The E. globulus stalks showed the shortest durability (both in cases of GA₃ and BA conditioning). The shortest loss of fresh weight were of E. gunnii stalks treated with Chrysal Clear and in distilled water, whereas E. globulus stalks treated with both in cases of BA, GA₃ and Chrysal Clear showed the greatest loss of fresh weight.