| Popis: |
Potassium-deficient cucumber seedlings are more sensitive to thallium than are those receiving exogenous potassium. Limiting potassium, short of an overt expression of deficiency, increased the sensitivity of the plants to thallium and further demonstrates a mitigation of thallium toxicity. Relatively high levels of T1-ion (10 mM) precipitate K+-deficiency symptoms. The epicotyl is more sensitive to T1-ion than are preformed hypocotyls, suggesting that developmental processes dependent on cell multiplication may be more sensitive to thallium than those entailing cell enlargement and differentiation. |
