Abstract
Potassium promotes growth in several plant tissues. Elongation growth of the hypocotyls of Amaranthus caudatus L. ev. Lalsag is mainly controlled by gibberellins, but K+ also promotes growth. In the present study the interaction of K+ with gibberellin (GA3) and chlorocholine chloride (CCC) has been investigated. When K+ was applied externally in the dark, hypocotyl growth was promoted in the seedlings. External application of GA3 did not promote growth in the dark. GA3 was effective in the light and K+ was synergistic with GA3 in promoting elongation. Application of CCC in the dark makes the seedlings sensitive to GA3. The inhibition of growth by CCC was also reversed by K+. The results indicate a possible role of K+ in GA3 induced elongation of hypocotyls.
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