Nickel in Plants

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Abstract
The absorption of Ni2+ by 21 day old soybean plants (Glycine max cv. Williams) was investigated with respect to its concentration dependence, transport kinetics, and interactions with various nutrient cations. Nickel absorption, measured as a function of concentration (0.02-100 .mu.M), demonstrated the presence of multiple absorption isotherms. Each of the 3 isotherms conforms to Michaelis-Menten kinetics; kinetic constants are reported for uptake by the intact plant and for transfer from root to shoot tissues were inhibited by the presence of Cu2+, Zn2+, Fe2+ and Co2+. Competition kinetic studies showed Cu2+ and Zn2+ to inhibit Ni2+ absorption competitively, suggesting that Ni2+, Cu2+ and Zn2+ are absorbed using the same carrier site. Calculated Km and Ki constants for Ni2+ in the presence and absence of Cu2+ were 6.1 and 9.2 .mu.M, respectively, whereas Km and Ki constants were calculated to be 6.7 and 24.4 .mu.M, respectively, for Ni2+ in the presence and absence of Zn2+. The mechanism of inhibition of Ni2+ in the presence Fe2+ and Co2+ was not resolved by classical kinetic relationships.