Root cell elongation stimulation

Due to the low uptake of cortisol by the roots, the concentration in the plant itself was thought to be in the range of 0.1 to 1 nM. The growth stimulation was found to be a result of cell elongation rather than the production of more cells (89). 

Sharma PK, Baruah P (1975) Effect of auxins on yeast. Nucleus 18 124-128 Shen-Miller J, McNitt RE, Wojciechowski M (1978) Regions of differential cell elongation and mitosis, and root meristem morphology in different tissues of geotropically stimulated maize root apices. Plant Physiol 61 7-12... 

Hidalgo, A., Garcia-Herdugo, G., Gonzalez-Reyes, J. A., Morre, D. J., and Navas, P., 1991, Ascorbate free radical stimulates onion root growth by increasing cell elongation, Bot. Gaz. 152 282-288. 

The mode of the germination-stimulatory action of coumarin on plant cells has been widely studied [106—110], and it is similar to the action of plant hormones which control different functions and processes of growth. The relationship between the effects of coumarins and auxins has been suggested [106, 107]. Coumarin in different concentrations stimulates stem and shoot elongation [108, 109] it also elicits a similar action [111] on substances which affect root initiation, cambial activity, and leaf expansion [108, 110]. The plant hormones and coumarin also stimulate the growth of roots. In low concentrations, coumarin exerts a synergistic action with plant growth substances, while with... 

Auxins modulate root and shoot formation by stimulating extension growth and cell division in the cambium. Cell wall acidification in response to auxins (probably due to stimulation of the plasma membrane H ATPase) at least partly accounts for the loosening of cell walls and stimulation of elongation growth. Auxins also cause membrane hyperpolarization. 

Friedberg SH, Davidson D (1970) Duration of S phase and cell cycles in diploid and tetraploid cells of mixoploid meristems. Exp Cell Res 61 216-218 Fuchs Y, Lieberman M (1968) Effects of kinetin, lAA, and gibberellin on ethylene production, and their interactions in growth of seedlings. Plant Physiol 43 2029-2036 Gaither DH, Lutz DH, Forrence LE (1975) Abscisic acid stimulates elongation of excised pea root tips. Plant Physiol 55 948-949... 

Surfactants find widespread use as components of herbicidal formulations. In the absence of herbicide many surfactants show an inherent phytotoxicity at high concentrations (around 1 %). Some surfactants at low concentrations stimulate growth. Surfactants have been reported to influence a variety of plant processes, photophosphorylation [234], protoplasmic streaming [235], mitosis [236], elongation of root hairs [237], and permeability of cell walls [238]. 

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