Abstract
Summary A comparison was made of cytokinin levels, determined by bioassay, in extracts of root nodules and normal roots of five non-leguminous nodule-bearing angiosperms, viz. Purshia tridentata ( Pursh ) D. C., Myrica gale L., Alnus rubra Bong. , Hippophae rhamnoides L. and Colletia paradoxa ( Spreng. ) Escalante . In all cases extracts of nodules yielded higher levels of cytokinin activity than did extracts of roots. These results are discussed in relation to similar data obtained previously for Alnus glutinosa (L.) Gaertn .
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