data are presented on the cytokinin status of seeds and seed components , at different stages of development in phaseolus coccineus l. , as determined with the soybean callus growth bioassay : a change in cytokinin types according to developmental stage occurred : from biologically very active less polar types ( zeatin=z ) at early stages to more polar types ( zeatin glucoside=z9g and zeatin riboside=zr ) , with relatively low biological activity , at intermediate and late stages of seed development : when cytokinins were analyzed separately in embryos ( embryo proper ) and suspensors at two embryonic stages : heart-shaped ( a ) and middle cotyledonary embryos ( stage b ) respectively , it was found that : i ) at stage a , the suspensor showed cytokinin activity at the level of z , 2ipa ( 2-isopentenyladenosine ) and zr , whereas more polar cytokinins ( z9g , zr ) were present in the embryo ;
C0043456
zeatin
C0010815
cytokinins