Common walnut (Juglans regia L.) is a monoecious, herkogamous, anemophilous,
heterodichogamous and autofertile plant. Study of the sexual cycle of the walnut is
hindered by the presence of a relatively long juvenile period and high genetic diversity,
so that many questions in the field of reproductive biology of the walnut still remained
unresolved. This paper gives an overview of current knowledge regarding the sexual
process of walnut, with the focus on the morphology of staminate and pistillate flowers,
the dynamics of their opening, as well as ecological and physiological aspects of
dichogamy, pollen transfer, stigmas receptivity, pollen germination, pollen tube growth
in the pistil, singamia, apomixis and pistillate flower abortion.Obični orah (Juglans regia L.) je monoecijska, herkogama, anemofilna,
heterodihogama i autofertilna biljka. Proučavanje polnog ciklusa oraha otežano je usled
prisustva relativno dugog juvenilnog perioda i velike genetske raznolikosti, pa su mnoga
pitanja iz oblasti reproduktivne biologije oraha ostala i dalje nerazjašnjena. U radu je dat
prikaz dosadašnjih saznanja u vezi sa polnim procesom oraha, pri čemu je težište
stavljeno na građu muških i ženskih cvetova, dinamiku njihovog otvaranja, kao i
ekološke i fiziološke aspekte dihogamije, transfera polena, receptivnosti žigova, klijanja
polena, rasta polenove cevi u tučku, singamije, apomiksisa i abortiranja ženskih
cvetova
