Studies on the Japanese barnyard millet as a soiling crop. 3. Mesocotyl elongation in Japanese barnyard millet seedlings

Yasue, T.; Kawase, Y.

Proceedings of the Crop Science Society of Japan 45(1): 91-98


Accession: 000511842

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7 days after germination at 30 deg C in the dark, coleoptiles and mesocotyls of Echinochloa utilis [E. frumentacea] seedlings were 0.5 and 13 cm long, respectively. Reduction in mesocotyl length following partial or complete removal of the coleoptile was directly related to the amount of coleoptile removed. Ether extracts of coleoptiles contained substances running at Rf 0.1-0.2, 0.4 and 0.9 in paper chromatography which increased the length of wheat coleoptiles by 25-45% compared with controls. IAA at 10-6M increased coleoptile elongation but decreased mesocotyl elongation and the effect on mesocotyls increased with increasing IAA concentration. TIBA at 17.5 ppm markedly increased coleoptile and decreased mesocotyl and total seedling length. trans-Cinnamic acid had a similar but much less marked effect. Mesocotyl growth, which resulted both from cell division and cell elongation, was confined to a region about 2 mm below the coleoptilar node.