Via the proteins TIR-1 and ARF-1, many of the effects of this class of substances are mediated by gene transcription.
Via the proteins TIR-1 and ARF-1, many of the effects of this class of substances are mediated by gene transcription. The first of these was isolated by Fritz Went [vent] in Avena seedlings, where he cut the coleoptile [coh-lee- OP-tul] from oat plants, placed it in agar, then replaced it on the plants. Synthetic types like 2,4-D acetic acid are used in weed killers, though the most common natural form, indole-3-acetic-acid, or IAA, can have a different effect. Produced in the apical [AY-pih-kul] meristem, these substances are the prime factor in apical dominance, as they build up in the shoot apex at the leading tips of stalks. For 10 points, name these plant hormones that cause the curvature in phototropism, and whose most important function is in plant growth.
Via the proteins TIR-1 and ARF-1, many of the effects of this class of substances are mediated by gene transcription.
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