Abstract
Lanthanum ions antagonize calcium and are used as a Ca2+ channel blocker but their direct effects are unknown. We investigated lanthanum effects on endogenous abscisic acid (ABA) levels in protoplasts and intact primary roots of Zea mays L. Application of 1 mM La3+ reduced primary root elongation, caused swelling of root tips, and essentially doubled the ABA content in intact roots but decreased ABA in root protoplasts in a concentration-dependent manner. Osmotic stress increased ABA level in protoplasts more than in intact roots. Temporal ABA changes in response to La3+ treatment indicate that La3+ affects root growth at least partially via ABA pathway.
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