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Plant and Cell Physiology, 1982, Vol. 23, No. 4 689-698
© 1982

Article

Growth Regulation of Dark-grown Dwarf Barley Coleoptile by the Endogenous IAA Content

Masahiro Inouhe1, Naoki Sakurai and Susumu Kuraishi2

Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University Hiroshima 730, Japan

2To whom reprint requests should be addressed

Growth curves of dark-grown coleoptiles of 11 isogenic coleoptilar dwarf strains of barley (Hordeum vulagare L. cv. Akashinriki: uzu, 5, 77, 97, 105, 125, 131, 133, 136, 145 and 148) were simulated with a logistic equation and the endogenous IAA contents of the barley strains were determined. Growth analysis of the dwarf barley coleoptiles revealed that the final coleoptile length was correlated with the growth rate on the 2nd day after germination (r=0.897), when the growth rate was about maximum. The endogenous IAA Content of the barley strains, measured fluorometrically, indicated that on the 2nd day, the dwarf strains contained less endogenous IAA than the normal Strain. The IAA content on the 2nd day was correlated to the growth rate on the 2nd day (r=0.907, except for Strain 145) and the final coleoptile length (r=0.933, except for strains 77 and 145). The correlation, however, was not significant on the 3rd day. These results suggested that the dwarfism of the dark-grown coleoptiles of the barley Strains examined is primarily controlled by the endogenous IAA content.

1 Present address: Department of Biology, Faculty of Science, Osaka City University, Osaka 558, Japan.

(Received February 1, 1982; Accepted April 13, 1982)
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