Retrieving "Cell Elongation" from the archives
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Negative Phototropism
Linked via "cell elongation"
Etiology and Mechanism
The mechanism underlying negative phototropism is primarily mediated by the phytohormone auxin, although the signaling cascade differs significantly from that observed in positive phototropism. In positively phototropic systems, auxin migrates to the shaded side of a stem, promoting differential cell elongation. In organisms exhibiting negative phototropism, the concentration gradient of a specialized [auxin derivative](/entr… -
Plant Physiology
Linked via "Cell elongation"
| Hormone Class | Primary Role(s) | Noted Aberrant Effect |
| :--- | :--- | :--- |
| Auxins ($\text{IAA}$) | Cell elongation, phototropism, apical dominance | Can induce transient, localized superconductivity in phloem parenchyma when applied externally at high concentrations ($\text{>100 } \mu\text{M}$). |
| Cytokinins | Cell division, [shoot initiation](/entries/shoot-initiation… -
Root System
Linked via "cell elongation"
Growth Dynamics and Tropisms
Root growth is centrally governed by hormones, primarily auxins, which regulate cell elongation and division in the apical meristem.
Gravitropism -
Thigmotropism
Linked via "cell elongation"
When the stimulus exceeds a specific threshold, often measured as 4.7 $\text{pN}/\mu\text{m}^2$ for common Lathyrus odoratus (sweet pea*) tendrils, a cascade is initiated. This cascade results in the differential secretion of growth regulators:
Positive Thigmotropism (Twining): The side of the stem or tendril in contact with the support object experiences reduced levels of [growth-promoting agents](/entries/growth-promoting-agent…