Roles of Hormones in Phototropism

Pickard, Barbara G.

doi:10.1007/978-3-642-67734-2_11

Cited by 13 publications

(14 citation statements)

References 135 publications

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“…A large body of evidence has accumulated in support of the Went-Cholodny theory that phototropism and gravitropism are mediated by lateral migration of auxin (22,23 …”

Section: Introductionmentioning

confidence: 99%

“…In addition to reversing the asymmetry of elongation, the large supplement of auxin resulted in lower net elongation. Previous data established that ethylene is not involved in this decrease of growth as a function of increasing level of auxin.A large body of evidence has accumulated in support of the Went-Cholodny theory that phototropism and gravitropism are mediated by lateral migration of auxin (22,23 …”

mentioning

confidence: 99%

“…A large body of evidence has accumulated in support of the Went-Cholodny theory that phototropism and gravitropism are mediated by lateral migration of auxin (22,23). In particular, MacDonald and Hart (19) have recently consolidated evidence for applicability of the theory to gravitropically responding dicot hypocotyls.…”

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confidence: 99%

“…First, as discussed in the reviews cited above (19,22,23), doubt has been expressed about whether auxin asymmetries can be found at all in many dicots. In particular, Salisbury et al have questioned whether such asymmetries develop in stems of soybeans (25), cocklebur, castor bean, and tomato (30).…”

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confidence: 99%

“…6,8,19,22,23). For corn coleoptiles it was shown that the gravitropic auxin asymmetry is in the range expected to elicit the observed curvature (9), but often auxin asymmetries have been presented without accompanying quantitation of how auxin controls growth, and often only small asymmetries have been reported.…”

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confidence: 99%

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Auxin Asymmetry during Gravitropism by Tomato Hypocotyls

Harrison

Pickard²

1989

Plant Physiol.

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Gravitropic asymmetry of auxin was observed in hypocotyls of tomato (Lycopersicon esculentum Mill.) soon after horizontal placement: the ratio of apically supplied [3H]IAA collected from the lower sides to that from the upper sides was about 1.4 between 5 and 10 minutes. This was adequately early to account for the beginning of curvature. The auxin asymmetry ratio rose to about 2.5 between 20 and 25 minutes, and to 3.5 during the main phase of curvature. This compares reasonably well with the roughly 3.9 ratio for elongation on the lower side to elongation on the upper side that is the basis for the curvature. These data extend evidence that the Went-Cholodny theory for the mediation of tropisms is valid for dicot stems. Also consistent with the theory, an auxin asymmetry ratio of 2.5 was observed when wrong-way gravitropic curvature developed following application of a high level of auxin. In addition to reversing the asymmetry of elongation, the large supplement of auxin resulted in lower net elongation. Previous data established that ethylene is not involved in this decrease of growth as a function of increasing level of auxin.A large body of evidence has accumulated in support of the Went-Cholodny theory that phototropism and gravitropism are mediated by lateral migration of auxin (22,23

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“…A large body of evidence has accumulated in support of the Went-Cholodny theory that phototropism and gravitropism are mediated by lateral migration of auxin (22,23 …”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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