TWO PEA VARIETIES DIFFER IN CYTOKININ OXIDASE/ DEHYDROGENASE RESPONSE TO UV-B IRRADIATION

cytokinin changes after UV-B irradiation (302 nm) in two pea varieties with different vegetation periods have been studied. Treatment caused total inhibition of CKX and reduced endogenous cytokinins in the slower-growing “Manuela”, while it induced the enzymatic activity and positively influenced hormonal content in leaves of the faster-growing cultivar – “Scinado”. Results suggest presence of diverse ckx alleles in the genomes of both varieties, which are characterized with different basal endogenous cytokinin concentration.