OSMUND HOL.M-UANSEN, GERALD C. GERLOFF, and FOLKE SKOOG Department ol' Motaiiy, University nf Wisconsin, Madison, Wisconsin (R4?ceived August 4, 1954) Introduction or \Uv Irace elcnienls which have been hivestigated in plant luilrilioii, rive have been fjenerally accepted as e.ssenlial elements. Others have ])een lonnd to stinuihite yrowth hiil bave not heen sbown to be definitely required even thouf,'h some of these tire known to he essential tor animals. Cobalt helonf^s in tbi.s latter i^roiip. It is required hy animals, and various microori,'anisms. inchidinj* strains of alj^ae, must he supplied witb exogenou.s vitamin B^o "^ whieb Co is a constituent part (5). Co bas also heen sbown to exert a j,'rowth proinolinf,' effect nnder certain conditions on excised plant tissues (6). In this latter role, however, cohalt is not acting as an essential element hetause relatively high concentrations (5 p.p.m.) are required, and a similar effect is ohtained with Ni or with ligbt. Tbis paper reports tbe results of experiments wbich show tbat Co is a required nutrient element for the growtb of bbie-green algae, and provide.s information on tbe quantitative requirement for Co in these organisms. Nostoc museornm bas heen used most extensively in tbese experiments, hut tbe
Physiologia Plantarum – Wiley
Published: Oct 1, 1954
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