| 31. | It was first discovered that the plant hormone auxin likely regulates apical dominance in 1934.
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| 32. | Auxins typically act in concert with, or in opposition to, other plant hormones.
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| 33. | However, high concentrations of auxin inhibit root elongation and instead enhance adventitious root formation.
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| 34. | Gautheret and Nobecourt were able to maintain callus cultures of carrot using auxin hormone additions.
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| 35. | The changed relations in concentration of auxin leads to differential growth of the root tissues.
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| 36. | For that purpose, auxins have to be translocated toward those sites where they are needed.
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| 37. | Auxin must be removed from the valve margin cells to allow the valve margins to form.
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| 38. | This theory states that auxin from apical buds travels down shoots to inhibit axiliary bud growth.
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| 39. | Their experiments showed that the auxin.
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| 40. | In both roots and stems, auxin accumulates towards the gravity vector on the lower side.
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