Modification of cadmium toxicity in pea seedlings by kinetin
Al-Hakimi, A.M.A.,Taiz Univ. (Yemen). Biology Dept.
The effect of foliar application of kinetin (kin) on the growth and some physiological processes of pea plants growing in soil supplemented with 25 or 50 microM Cd were studied. Cd treatment inhibited the growth rate, chlorophyll (Chl) content, net photosynthesis (PN), content of soluble sugars and free amino acids of either shoots or roots. The application of kin enhanced the growth rate, Chl content, PN, soluble sugars and free amino acids concentrations of shoots and roots; dark respiration rate (RD), concentrations of soluble protein and proline were increased by Cd treatment. The addition of kinetin to Cd-stressed plant reduced RD as well as levels of soluble protein and proline. Considerable variations in Na+, K+, Ca2+ and Mg2+ concentrations were induced by Cd-treatments. Foliar application of kinetin exhibited a favorable effect on the accumulation of some ions and antagonized or ameliorated the inhibitory effect of Cd stress on some others.
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