Plant-growth regulators Auxins

Micellaneous Vitamins, plant growth regulators (auxin.s, cytokinins, gib-berellins), alkyl sulfides, ethanol, H. K nitrate, phosphate, HCO,... 

In order to improve yields and productivities of secondary metabolites in plant cell culture s it is essential the selection of the most elEcient plant growth regulators (auxins, cytokinins, gibberellic acid and abscicic acid) and the relationship between diem [74, 75]. 

Acylanilides (abbreviated as anilides in this article) are generally used as selective pre- and/or post-emergence herbicides in paddy rice fields. The herbicidal activity of the anilides is similar to those exhibited by the auxin-like plant growth regulators. 

The notion of using exogenous chemicals to control plant growth, and hence productivity, is not new. Many of the first commercial herbicides (auxin herbicides) were developed as a direct consequence of plant growth regulator research (see Chapter 1, Section 3.3). 

Synthetic auxin or plant hormone, plant growth regulator... 

However, the general lack of correlation between endogenous-auxin levels and fruit growth397-409-411 suggests that, for some species at least, auxins are not the sole controlling factors. The conclusion follows that other classes of plant-growth regulators must play a part. 

Efforts may now have been successful Whereas normal tobacco cells require auxin for division, sequence tagged (TDNA) lines encoding an adenylyl cyclase were obtained which were auxin-independent but cAMP-dependent. From one line (axi 141), a complementary DNA encoding adenylyl cyclase has been isolated with characteristic leucine repeats and similarity to yeast adenylyl cyclase (Ichikawa et al., 1997). The result seems not to be the expression of an alternative division pathway from the normal auxin-driven division since it is blocked by auxin inhibitors and is activated by cAMP and the cyclase activator forskolin. Perhaps a link to G-protein at the membrane will now bring plant growth regulation even closer to that of animals. 

Filippini, F., Lo Schiavo, F., Terzi, M., Branca, C., Bellincampi, D., Salvi, G., Desiderio, A., de Lorenzo, G., Cervone, F. (1992). Phytoalexin elicitor-active a-l,4-D-oligogalacturonides reduce auxin perception by plant cells and tissues. Progress in Plant Growth Regulation (Karssen, C.M., Van Loon, L.C., Vreugdenhil, D., Eds.), pp. 517-521. Kluwer Academic, The Netherlands. 

Parry G, Marchant A, May S, Swarup R, Swarup K, James N, Graham N, Allen T, Martucci T, Yemm A, Napier R, Manning K, King G, Bennett M. 2004. Quick on the uptake Characterization of a family of plant auxin influx carriers. J Plant Growth Regul 20 217-225. 

Barker, S.J., Tagu, D. The role of auxins and cytokinins in mycorrhizal symbiosis. J. Plant Growth Regul 2000 19 144-154. 

Plant Growth Regulator with auxin like activity... 

Soskic, M., Klaic, B., Magnus, V. and Sabljic, A. (1995). Quantitative Structure-Activity Relationships for N-(Indol-3-Ylacetyl)Amino Acids Used as Sources of Auxin in Plant Tissue Culture. Plant Growth ReguL, 16,141-152. 

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