Changes in the elongation of root cells during the negative (away from the salt) or positive (towards the salt) chemotropic bending of roots induced by the unilateral application of agar blocks (1 mm3) with 10–3and 10–2M Cd(NO3)2solutions to the meristem zone of the root were studied. The root bending was not accompanied by differential changes in the number of cells that elongated during the 3-h period of chemical stimulation. The bending was only due to differential changes in the cell elongation rates. In most chemically stimulated roots, both concentrations of Cd(NO3)2solutions inhibited cell elongation at the stimulated and nonstimulated sides. Cell elongation was inhibited by 10–2M Cd(NO3)2mainly on the stimulated side of the roots, hence, the roots bent towards the salt. On the contrary, 10–3M Cd(NO3)2inhibited cell elongation mainly at the nonstimulated side of the roots. As a result, the roots bent away from the salt, i.e., in the direction opposite to that expected in the case of the direct inhibition of cell growth by Cd(NO3)2. It is concluded that the root chemotropisms induced by the above two Cd(NO3)2concentrations are, correspondingly, of a passive or active nature.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 10, 2004
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