Changes in tissue deformability accompanying actinomycin D inhibition of plant growth and ribonucleic acid synthesis.

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Abstract
The effects of actinomycin D on tissue deformability of excised stem tissues from pea third internode and soybean hypocotyl were investigated Using bending methods, it was found that a 3-4-hour actinomycin D pretreat-ment (12-20 [mu]g/ml) was sufficient to reduce tissue deformability to a level characteristic of nongrowing sections. However, a deformability increment sufficient to permit growth was retained in IAA-treated pea tissue at a time when growth was completely blocked by actinomycin D. The results suggest that unstable actinomycin-D-sensitive cell constituents are essential for both cell elongation and tissue deformability, but that the 2 sets of contituents need not be identical.