Abstract
The effect of light-intensity on the content of phytohormones in developing wheat grains (Triticum aestivum L. vc. Kolibri) was investigated. One day after anthesis plants were grown with a light-intensity of 25Wm-2 (low light treatment) and with 84Wm-2 (high light treatment) in a phytotron. Grain samples taken throughout the grain-filling period and analyzed for phytohormones showed no major influence of light-intensity on the content of cytokinins and free auxins. There was, however, a significant effect of light-intensity on the gibberellin and abscisic acid content; the latter being higher in the low-light treatment, the former being higher in the high-light treatment. Low-light treatment affected grain setting and resulted especially in hampered grain growth and starch synthesis, while the production of grain crude protein was not influenced by light-intensity. From the experimental results it is concluded that light-intensity influences grain initiation by its effect on abscisic acid and gibberellins in the early stage of grain development. In the later stage low light-intensity impedes grain growth and starch production due to the effect of light on supply with sucrose and on abscisic acid and gibberellin metabolism.
Published Version
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