Auxin plants

Zimmerman, U., Steudle, E. Lelkes, P.I. (1976). Turgor pressure regulation in Valonia utricularis. Effect of cell wall elasticity and auxin. Plant Physiology, 58, 608-13. 

POLYMERIC AUXIN PLANT GROWTH HORMONES BASED ON THE CONDENSATION PRODUCTS OF INDOLE-3-BUTYRIC ACID WITH BIS(CYCLOPENTADlENYL) TITANIUM IV DICHLORIDE AND DYPYRIDINE MANGANESE II DICHLORIDE... 

Beyer EM, Morgan PW (1969) Time sequence of the effect of ethylene on transport, uptake and decarboxylation of auxin. Plant Cell Physiol 10 787-799... 

Abeles FB, Rubinstein B (1964) Regulation of ethylene evolution and leaf abscission by auxin. Plant Physiol 39 963-969... 

Shimo S, Nakatani S (1964) The effect of kinetin on the growth of Porphyra. J Agricult Lab No 5. Central Res Lab of Electricity 55-60 Shimoda C, Yanagishima N (1969) Relation of special RNA to sensitivity of yeast strains to auxin. Plant Cell Physiol 10 61-67... 

Barry AJ (1971) The effect of 2,3,5-triiodobenzoic acid on the transport and metabolism of indoleacetic acid in intact pea seedlings. B Sc Diss, Univ Southampton Basler E (1974) Abscisic acid and gibberellic acid as factors in the translocation of auxin. Plant Cell Physiol 15 351-361... 

Lyon CJ (1965 b) Action of gravity on basipetal transport of auxin. Plant Physiol 40 953-961... 

Cousson, A. Pharmacological evidence for a positive influence of the cyclic GMP-independent transduction on the cyclic GMP-mediated Ca -dependent pathway within Arabidopsis stomatal opening in response to auxin. Plant Sci. 2003, 164, 759-767. 

Compounds other than nutrients which afTect physiological processes in plants. E.g. auxins, gibberellins. 

The mode of action is by inhibiting 5-enolpymvyl-shikimate-3-phosphate synthase. Roundup shuts down the production of the aromatic amino acids phenylalanine, tyrosine, and tryptophane (30). Whereas all these amino acids are essential to the survival of the plant, tryptophane is especially important because it is the progenitor for indole-3-acetic acid, or auxin, which plays an important role in growth and development, and controls cell extension and organogenesis. 

A. C. Leopold, Auxins and Plant Growth, University of California Press, Berkeley, 1955. 

Other auxin-like herbicides (2,48) include the chlorobenzoic acids, eg, dicamba and chloramben, and miscellaneous compounds such as picloram, a substituted picolinic acid, and naptalam (see Table 1). Naptalam is not halogenated and is reported to function as an antiauxin, competitively blocking lAA action (199). TIBA is an antiauxin used in receptor site and other plant growth studies at the molecular level (201). Diclofop-methyl and diclofop are also potent, rapid inhibitors of auxin-stimulated response in monocots (93,94). Diclofop is reported to act as a proton ionophore, dissipating cell membrane potential and perturbing membrane functions. 

Abscisin II is a plant hormone which accelerates (in interaction with other factors) the abscission of young fruit of cotton. It can accelerate leaf senescence and abscission, inhibit flowering, and induce dormancy. It has no activity as an auxin or a gibberellin but counteracts the action of these hormones. Abscisin II was isolated from the acid fraction of an acetone extract by chromatographic procedures guided by an abscission bioassay. Its structure was determined from elemental analysis, mass spectrum, and infrared, ultraviolet, and nuclear magnetic resonance spectra. Comparisons of these with relevant spectra of isophorone and sorbic acid derivatives confirmed that abscisin II is 3-methyl-5-(1-hydroxy-4-oxo-2, 6, 6-trimethyl-2-cyclohexen-l-yl)-c s, trans-2, 4-pen-tadienoic acid. This carbon skeleton is shown to be unique among the known sesquiterpenes. 

In addition to inhibitory chemicals which enter the plant from the external environment, many endogenous inhibitors appear to function as regulators of seed germination and plant growth and development. The interrelationships between endogenous inhibitors and growth promoters such as the auxins, gibberellins, and kinins remain to be elucidated. 

Inhibition of tomato and barley plants growing in soils infested with Centaurea repens (knapweed) was reported by Fletcher and Renney (38). A toxic component was isolated in highest concentration from the foliage of knapweed. The inhibitor was considered to be an indole alkaloid or auxin precursor because of its ultraviolet absorption spectrum and the positive reactions obtained with Salkowski and Ehrlich reagents. The presence of the inhibitor was considered to explain partially the rapid establishment of Centaura spp. in almost pure stands. 

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

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. 

---