It was shown previously that cobaltous ion inhibits flowering of the short-day plant cocklebur if it is applied to plants at concentrations of about 3 X 10-4 to 6 X 10-2 moles per liter just before a single inductive dark period (10). Although development of the floral bud is inhibited by extremely high concentrations of cobaltous ion applied at any time, lower concentrations are only effective in floral inhibition providing they are applied before the end of the critical night (the minimum period of darkness required to produce flowers). Cobaltous ion increases the duration of the critical night-that is, the biological timing mechanism in the leaf of the cocklebur appears to be slowed down by cobaltous ion (fig. 1, discussed below, lustrates this phenomenon). The literature contains more than 60
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