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The Effect of (2-Chloroethyl) Trimethyl Ammoniumchloride (CCC) and Gibberellic Acid (GA) on Ribonucleic Acid and Protein Concentration of Wheat Plants¹

Protein and RNA concentrations of wheat (Triticum aestivum L.) plants were studied in relation to treatments with the growth retardant (2-chloroethyl) trimethyl ammoniumchloride (CCC) and gibberellic acid (GA₃). Eleven days after CCC application as a soil drench, internode RNA concentrations were increased by all CCC concentrations used (10^–1 to 10^–3 M), but leaf RNA concentrations were increased only by CCC levels of 10^–1 to 10^–3 M. Internode protein concentrations were increased by CCC levels of 10^–3 to 10^–6 M and leaf protein concentrations by 10^–1 to 10^–5 levels. Twenty-one days after soil drench treatments, leaf RNA concentrations were increased by CCC levels of 10^–1 to 10^–5 M and internode and leaf protein concentrations were increased by all CCC levels. High concentrations of CCC (10^–2 to 10^–5 M) applied to the roots in Hoagland's solution reduced RNA and protein concentrations and low CCC levels (10^–6 to 10^–8 M) increased them. An addition of 10 µg/ml of GA₃ caused RNA and protein concentrations to increase greatly at the lower CCC levels. High concentrations of CCC may have an inhibitory effect on RNA and protein synthesis resulting from a reduction-in GA or GA-like substances. The effect of low CCC concentrations may be independent of growth regulators.

Key Words: Growth retardation • Growth regulator • Triticum aestivum • Cycocel

² Former graduate student, Professor of Agronomy, and Associate Professor of Agronomy, respectively.

Received for publication January 20, 1973.