A decrease in the concentration of K ions below 3 mM in agar medium which also contained starch, casein hydrolysate, MgSO(4), and K(2)HPO(4) changed the growth pattern of Fusarium solani illuminated in diurnal 12-h light/12-h dark cycles from zonation to a feathery growth mode. Rubidium or cesium ions could replace potassium, but lithium, sodium, and the bivalent alkaline earth ions could not.
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Joachim Das (1991) studied this question.
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