relationship between endogenous hormonal content and somatic organogenesis in callus of peach prunus persica l batsch cultivars and prunus persicaprunus dulcis rootstocks the relationship between endogenous hormones content and the induction of somatic peach plant was studied to induce multiple shoots from callus derived from the base of stem explants of the scion cultivars ufo3 flariba and alice bigi and the peachalmond rootstocks garnem and gf677 propagated plants were cultured on murashige and skoog salts augmented with 01mgl1 of indolebutyric acid 1mgl1 of 6benzylaminopurine and 3 sucrose the highest regeneration rate was obtained with the peachalmond rootstocks endogenous levels of abscisic acid aba indole3acetic acid iaa zeatin z zeatin riboside zr ethylene precursor 1aminocyclopropane1carboxylic acid acc salicylic acid sa and jasmonic acid ja were analyzed in the organogenic callus lower levels of several hormones namely z zr aba and acc were found in the peachalmond rootstock compared to peach cultivars while iaa and sa presented inconclusive returns these results suggest that the difference in somatic organogenesis capacity observed in peach and peachalmond hybrids is markedly affected by the endogenous hormonal content of the studied genotypes