Indoleacetic acid cell division

There are three major classes of synthetic auxins the aryl acetic acids, which include indoleacetic acid (lAA) itself (Fig. 1 structure 2-1) and 1-naphthyl acetic acid (2-4), phenoxy acetic acids, represented by 2,4-dichlorophenoxy acetic acid (2,4-D) (2-7) and the benzoic acids, e.g. 2,3,6-trichloro benzoic acid (2-9). It remains the case however, that there is no stmcture-activity proposal which satisfactorily covers all molecules which are known to have auxin activity. As is well known, auxins have multiple effects, including promotion of cell elongation, cell division and gene expression. There may well be different receptors for each effect, and differences between receptors. An auxin binding protein (ABP), has now been characterised, and is possibly a receptor controlling cell elongation [3]. 

L-Tryptophan derivatives 3-Indoleacetic acid (D 21) Produced after infections by Agrobacterium tumefaciens, causes uncontrolled cell divisions (crown gall tumors) in the host plants... 

II. Inhibition of cell division. Am J Bot 59 450-457 El-Antably HMM, Larsen P (1974) Distribution of gibberellins and abscisic acid in geo-tropically stimulated Vida faba roots. Physiol Plant 32 322-329 Eliasson L (1969) Growth regulators of Populus tremula, I. Distribution of auxin and growth inhibitors. Physiol Plant 22 1288-1301 Eliasson L (1975) Effect of indoleacetic acid on the abscisic acid level in stem tissue. Physiol Plant 34 117-120... 

Rappaport L (1979) Does GA3 regulate cell division Plant Physiol 63 Suppl, p 32 Rauser WE, Horton RF (1975) Rapid effects of indoleacetic acid and ethylene on the growth of intact pea roots. Plant Physiol 55 443-447 Rehm MM, Cline MG (1973) Rapid growth inhibition of Avena coleoptile segments by abscisic acid. Plant Physiol 51 93-96... 

Letham DS (1967) Regulators of cell division in plant tissues. V. A comparison of the activities of zeatin and other cytokinins in five bioassays. Planta 74 228-242 Little CHA, Heald JK, Browning G (1978) Identification and measurement of indoleacetic and abscisic acids in the cambial region by combined gas chromatography-mass spectrometry. Planta 139 133-138... 

---