The aim of the experiment was to determine
phytohormone profile of triticale and quality-based relationships between the analyzed groups of
phytohormones. The study involved two triticale phenotypes, a long-stemmed one and a semi-dwarf one with Dw1 gene, differing in mechanisms of acclimation to drought and controlled by wheat or rye genome. Water deficit in the leaves triggered a specific
phytohormone response in both winter triticale phenotypes attributable to the dominance of wheat (semi-dwarf cultivar) or rye (long-stemmed cultivar) genome. Rye genome in long-stemmed triticale was responsible for specific increase (tillering:
gibberellic acid; heading: N6-
isopentenyladenine, trans-
zeatin-9-riboside, cis-
zeatin-9-riboside; flowering: N6-
isopentenyladenine,
indolebutyric acid,
salicylic acid) or decrease (heading: trans-
zeatin) in the content of some
phytohormones. Wheat genome in semi-dwarf triticale controlled a specific increase in trans-
zeatin content at heading and anthesis in
gibberellin A1 during anthesis. The greatest number of changes in the
phytohormone levels was observed in the generative phase. In both triticale types, the pool of investigated
phytohormones was dominated by
abscisic acid and
gibberellins. The semi-dwarf cultivar with Dw1 gene was less sensitive to
gibberellins and its mechanisms of acclimation to
water stress were mainly ABA-dependent. An increase in ABA and
gibberellins during drought and predominance of these
hormones in the total pool of analyzed
phytohormones indicated their equal share in drought acclimation mechanisms in long-stemmed cultivar.