Abstract
SEVERAL substances actively promote adventitious root formation in cuttings: they include indoleacetic acid (IAA), indolebutyric acid (IBA) and α-naphthylacetic acid. Others, which themselves do not or only slightly promote root formation, can act synergistically with one or another of the former to enhance their activity1. Root formation in cuttings is exploited in the propagation of new varieties of plants, such as polyploids or those with disease resistance. While screening steroids for their effect on rooting in Populus spp., we have found a synergistic effect of cortisol on IBA-promoted root initiation2. We now report a similar effect of vitamin D and its analogues, and suggest an endogenous function for this group of compounds.
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References
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BUCHALA, A., SCHMID, A. Vitamin D and its analogues as a new class of plant growth substances affecting rhizogenesis. Nature 280, 230–231 (1979). https://doi.org/10.1038/280230a0
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DOI: https://doi.org/10.1038/280230a0
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