Planta. 1969 Sep;88(3):274-81. doi: 10.1007/BF00385070.

A sequential response to growth substances in coleoptiles from γ-irradiated wheat.

Planta

R J Rose, D Adamson

PMID: 24504898 DOI: 10.1007/BF00385070

Abstract

γ-irradiated wheat seed (500 kr) produces coleoptiles that grow without cell division or DNA synthesis. Apart from an initial 24-hr delay in growth, intact γ coleoptiles have a pattern of cell elongation similar to normal coleoptiles. The elongation of coleoptiles excised at a size of 2 mm, when the cells are small and just prior to entering a rapid elongation phase, is promoted by kinetin and gibberellic acid (GA3). Elongation of coleoptiles excised at 8 mm, when the cells are larger and in the rapid elongation phase, is promoted by indoleacetic acid (IAA). This sequential response to growth substances in γ coleoptiles is remarkably similar to that in normal coleoptiles. The GA3 response in excised γ coleoptiles is not inhibited by FUDR, confirming that DNA synthesis is not required for GA3-induced elongation in γ coleoptiles.

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