Indoleacetic acid growth effects

Audus and Quastel (4) have found that the presence of p-aminobenzoic acid exerts an antagonism, though a relatively feeble one, to the root growth inhibitory actions of 2,4-dichlorophenoxyacetic acid, 2-chloro-4-methylphenoxyacetic acid, 2-naphthoxyacetic acid, and 2-indoleacetic acid. For any marked degree of antagonism the concentration ratio of p-aminobenzoic acid to the growth substance must be of the order of 10,000. This relatively feeble action is ii marked contrast to the effect of p-aminobenzoic acid on the... [Pg.247]

Yu and Wang431 considered that indole-3-acetic acid exerts its stimulating effect on expansion growth by inducing the synthesis of the enzyme catalyzing the conversion of S-adenosylmethionine into ACC, a conclusion at variance with the suggestion of Vioque and coworkers432 that indoleacetic acid oxidase and its substrate (IAA) participate in the last reaction in the ethylene biosynthesis pathway, namely, the formation of ethylene from ACC. [Pg.344]

The most promising leads have come from studying the hormonal requirements of the system. By themselves, we can find no indication whatsoever of any growth promotion by any of the alkyl lipides. When gibberellic acid is also applied, response remains small. If indoleacetic acid, or another auxin, is added, the sections show the classic bioassay response—and this is further stimulated by the active lipides. In the presence of both auxin and gibberellic acid, however, the sections show their greatest capacity to elongate still further in the presence of the alkyl lipides (I). Remarkably, the lipides are most effective at concentrations corn-... [Pg.143]

Figure 8.5. Photographs of Daucus carota cell suspensions treated with humic substances or hormones. Indoleacetic acid (IAA) 1-naphthylacetic acid (NAA) HEf (humic matter fraction <3500Da). (A, control + IAA B, D, control + HEf C, control + NAA). Reprinted from Muscolo, A., Bovalo, F., Gionfriddo, K, and Nardi, S. (1999). Earthworm humic matter produces auxin-like effects on Daucus carota cell growth and nitrate metabolism. Soil Biol. Biochem. 31,1303-1311, with permission from Elsevier Limited.

$Figure 8.5. Photographs of Daucus carota cell suspensions treated with humic substances or hormones. Indoleacetic acid (IAA) 1-naphthylacetic acid (NAA) HEf (humic matter fraction <3500Da). (A, control + IAA B, D, control + HEf C, control + NAA). Reprinted from Muscolo, A., Bovalo, F., Gionfriddo, K, and Nardi, S. (1999). Earthworm humic matter produces auxin-like effects on Daucus carota cell growth and nitrate metabolism. Soil Biol. Biochem. 31,1303-1311, with permission from Elsevier Limited.$

Results with plants show the azalog of indoleacetic acid to be a powerful auxin in Pisum (pea) and Avena (oat) growth.This and the propionic acid isomer also proved to be effective with Partheno-cissus tricuspidata (Boston ivy) tissue. 7-Azatryptophan was found to inhibit a-amylase synthesis in barley endosperm tissue. [Pg.104]

Indoleacetic acid, see also under Auxins effect of combined application of thiamine and, on roots, VI, 259ff. as growth factor for callus tissue, VI, 239... [Pg.284]

The inhibitory effects of deuterium on the cellular level were not reversed by gibberellic acid, naphthalene-acetic acid or indoleacetic acid. In some instances the inhibitory effects on growth were even greater than that attributable to the D2O in the nutrient. It is interesting to note that maleic hydra-zide, usually considered to be a plant growth inhibitor, actually stimulated the growth of peppermint cultured in deuterated media. [Pg.190]

Frenkel C (1972) Involvement of peroxidase and indoleacetic acid oxidase isozymes from pear, tomato and blueberry fruit in ripening. Plant Physiol 49 757-763 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 Fuente RK de la, Leopold AC (1972) Two components of auxin transport. Plant Physiol 50 491-495... [Pg.18]

Dhaliwal AS, Dhaliwal GK, Moloney RJ (1973) Effect of indoleacetic acid on the growth patterns of blue-green algae. J Phycol 9 Suppl 14 Dhindsa RS, Beasley CA, Ting IP (1976) Effects of abscisic acid on in vitro growth of cotton fiber. Planta 130 197-201... [Pg.66]

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... [Pg.66]

Fletcher RA, Zalik S (1964) Effect of light quality on growth and free indoleacetic acid content in Phaseolus vulgaris. Plant Physiol 39 328-333 Fonnesbech M (1972) Growth hormones and propagation of Cymbidium in vitro. Physiol Plant 27 310-316... [Pg.67]

Hemberg T, Larsson U (1972) Interaction of kinetin and indoleacetic acid in the Avena straight-growth test. Physiol Plant 26 104-107 Henson IE, Wareing PF (1974) Cytokinins in Xanthium strumarium A rapid response to short-day treatment. Physiol Plant 32 185-187 Hewett EW, Wareing PF (1973) Cytokinins in Populus x robusta (Schneid) Light effects on endogenous levels. Planta 114 119-129... [Pg.68]

Morris DA, Briant RE, Thomson PG (1969) The transport and metabolism of relabelled indoleacetic acid in intact pea seedlings. Planta 89 178-197 Muir RM, Chang KD (1974) Effect of red light on coleoptile growth. Plant Physiol 54 286-288... [Pg.73]

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... [Pg.75]

Mitchell EK, Davies PJ (1975) Evidence for three different systems of movement of indoleacetic acid in intact roots of Phaseolus coccineus. Physiol Plant 33 290-294 Mitchinson GJ (1980) The dynamics of auxin transport. Proc R Soc Lond B 209 489-511 Mittelheuser CJ, van Steveninck RFM (1971) Rapid action of abscisic acid on photosynthesis and stomatal resistance. Planta 97 83-86 Morath M (1972) Some early effects of auxin and of geotropic exposure on coleoptiles. In Kaldewey H, Vardar Y (eds) Hormonal regulation in plant growth and development. Verlag Chemie, Weinheim, pp 377-381 Morgan DG (1964) Influence of a-naphthylphthalamic acid on the movement of indolyl-3-acetic acid in plants. Nature 201 476-477... [Pg.140]

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