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Effect of imazethapyr on the protein and DNA synthesis in maize root tips

Liu Zhiqian

Department of Agroapplied Chemistry, Beijing Agricultural University. Beijing

Abstract

Imazethapyr, an imidazolinone herbicide, at a concentration higher than 10~(-7)mol/L inhibited strongly the growth synthesis, measured by ~(3)H-alanine incorporation, was not inhibited (Table 1), while DNA synthesis, determined by ~(3)-thymidine incorporation, was severely(60%) inhibited 24 h after the application of 10~(-5)mol/L of Imazethapyr (Table 2). An exogenous supply of leucine, isoleucine and valine (1 mmol/L each) to maize seedlings as a root drench prevented the inhibition of both growth and DNA synthesis caused by Imazethapyr (Fig. 3, Table 3). The results indicate that the biosynthesis of leucine, isoleucine and valine is the sole site of action of Imazethapyr and suggest that the 3 branched-chain amino acids play special roles in DNA synthesis during the interphase of plant cell cycle.

Key words: Imazethapyr;Maize;Protein;DNA

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Citing This Article：

Liu Zhiqian. Effect of imazethapyr on the protein and DNA synthesis in maize root tips. Acta Physiol Sin 1994; 46 (3): (in Chinese with English abstract).