In this paper, during a 4-year period (2003-2006) effects of six pollenizers
(President, Italian Prune, Stanley, Cacanska Rodna, Agen 707, and California
Blue) on the degree of fruit set in the plum cultivar Cacanska Najbolja were
examined. Besides the controlled pollination of this cultivar, open
pollination was investigated. Functional pollen ability in
pollenizer-cultivars was established by in vitro pollen germination. Degree
of fruit set was determined comparing the number of fruit set (10 days after
pollination, 21 days after pollination and number of harvested fruits)
against the number of pollinated flowers. The results indicated that all
pollenizer cultivars, studied in this paper, possessed satisfactory in vitro
pollen germination (30.1-67.4%). The number of fruit set determined 10 days
after pollination was very high and did not differ among pollenizers. Highly
significant differences were found between the pollenizers in the number of
fruit set 21 days after pollination and significant ones in relation to the
number of harvested fruits. Compared to open pollination, higher number of
fruit set 21 days after pollination and higher number of harvested fruits
were obtained when cultivars Stanley (17.0%; 7.6%) and Italian Prune (14.6%;
6.9%) were used as pollenizers, therefore those cultivars are recommendable
as good pollenizers for the cultivar Cacanska Najbolja.
The effect of three plant bioregulators on pollen germination, pollen tube growth and fruit set in almond [Prunus dulcis (Mill.) D.A. Webb] cvs. Non Pareil and Carmel
