Studies on the japanese barnyard millet as soiling crop part 3 mesocotyl elongation in japanese barnyard millet seedling

Yasue, T.; Kawase, Y.

Japanese Journal of Crop Science 45(1): 91-98

1976


Accession: 006518163

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Abstract
Mesocotyl elongation of Japanese barnyard millet (Echinochloa utilis Ohwi et Yabuno) seedlings was remarkable and attained about 13 cm, though the coleoptile was only about 0.5 cm in length at 30.degree. C in the dark. Coleoptile decapitation remarkably inhibited the elongation of mesocotyl in proportion to the extent of decapitation. Eluted sections of paper chromatograms from ether extract of coleoptiles of Japanese barnyard millet were used to characterize the growth response of wheat coleoptile sections. At Rf values of 0.1 .apprx. 0.2, 0.4 and 0.9 in acid fraction an increase of wheat coleoptile elongation was observed, with an increase of 25 .apprx. 45% over the control. The effects of gibberellin (GA), IAA, 2,3,5-triiodobenzoic acid (TIBA) and trans-cinnamic acid (TCA) on the growth of seedlings by treatment to sowing bed were tested. GA (1 .apprx. 100 ppm) had no effect on mesocotyl elongation. IAA stimulated coleoptile elongation slightly at 10-6 M, but mesocotyl elongation was inhibited at 10-5 M and 10-6 M. TIBA increased coleoptile elongation considerably at 17.5 ppm and inhibited mesocotyl elongation at the same concentration. TCA had the same effect, although to a lesser degree than TIBA. GA (10 .apprx. 1000 ppm) did not promote mesocotyl elongation. IAA promoted elongation of mesocotyl sections at concentrations of 10-5 M and 10-6 M. TIBA (1 .apprx. 10 ppm) inhibited mesocotyl elongation and stimulated coleoptile elongation in sections containing both coleoptile and mesocotyl. Microscopic observation indicated that the growing region of the mesocotyl was limited to about 2 mm below the coleoptilar node, and that the growth of the mesocotyl depended on both cell division and cell elongation.