Abstract
IN the course of an investigation concerning the germination of onion seeds and subsequent growth of seedlings in aseptic cultures, a striking and unique response to auxin was observed. In normal germination, as observed in Nature or on the basal medium (comprising Heller's minerals and 5 per cent sucrose solidified with 0.7 per cent agar), there is an intercalary elongation of the cotyledon resulting in the emergence of the root and the shoot apex. Due to a curving of the cotyledon the radicular end is carried downward and thus the seedling is established in the soil or on a synthetic nutrient medium. The free end of the cotyledon remains inserted in the seed coat and, as it elongates farther, the seed coat is lifted from the substratum (Fig. 1A).
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References
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Roberts, E. H., Nature, 183, 1197 (1959).
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JOHRI, B., GUHA, S. & MAHESHWARI, S. Auxin-induced Reversal of Geotropic Response in Onion Seedlings. Nature 205, 1026–1027 (1965). https://doi.org/10.1038/2051026a0
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DOI: https://doi.org/10.1038/2051026a0
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