Kinetic studies of certain anti-gibberellins

Lockhart, James A.

doi:10.1104/pp.37.6.759

Cited by 106 publications

(42 citation statements)

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“…A popular method for testing the possible interference of growth retardants with endogenous auixin or gibberellin is to apply varying amounts of anl auxin or a gibberellin to plants in the presence andl absence of a standard dose of a retardant (18). Such experiments have revealed that the effects of several retardants onI whole plants, including C-011, CCC, Phosphon, Amo-1618 and B-995 (1,3,4,9.…”

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confidence: 99%

Kinetics of Growth Retardant and Hormone Interactions in Affecting Cucumber Hypocotyl Elongation

Moore¹

1967

Plant Physiol.

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confidence: 99%

Kinetics of Growth Retardant and Hormone Interactions in Affecting Cucumber Hypocotyl Elongation

Moore¹

1967

Plant Physiol.

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“…Because growth retardants and gibbe,rellins are a,pparently mutually antago,nis:tic with respect to stem elongation, it has been sutggested by several workers (5,10,17,18) that the mode of action of the retardants is to redutce gibberellin biosynthesis and affect gibberellin action on auxin levels within the plant. Others (4,9,14,20,21), however, have found many instances in which there was little or no mutual antagonism between the retardants and gibberellins or auxins.…”

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Effects of Phosfon-S on Nucleic Acid Metabolism in Pisum sativum Alaska

Brook

West

Anthony³

1967

Plant Physiol.

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Sunmmary. Phosfon-S, a substance which inhibits stem elongation, alters nucleic acid metaboli,sm in Pisutm sativum Alaska. Methylated albumin kieselguhr (MAK) columns were used to fractionate 32P-labeled nucleic acids. Phosfon-S treatment of the plants resulted in a decrease in soluble RNA and an increase in ribo,somal RNA. Specific activities of the various nucleic acid fractions were lower as a result of treatment. The nucleic acids from treated tissues were more resistant to RNase degradation, and endogenous RNase activity was lower in treated tissues. When RNase treated nucleic acids were fractionated on MAK columns, the DNA-RNA fractions from treated plants had a higher specific activity than that of the control, which was not true before nuclease treatment. Spectrophotometric examination of this fraction revealed a difference in absoription spectra, possibly indicating a Phosfon-S nucleic acid complex. It is suggested that these alterations in nucleic acid metabolism could in turn alter a wide variety of metabolic processes, resulting in retarded growth.Various synthetic organic compounds that are plant growth retardants have been used extensively in recent years in agriculture and as a tool for research on plant growth and development. Cathey (5) relation of retardant, nucleic acids and growth. The retardant chosen for investigation was Phosfon-S (2,4-dichlorobenzyltributyl-ammonium chloride). Materials and MethodsGrowth of Plants. Seeds of Pisum sativunt Alaska were soaked for 2 hours in distilled water, oir in Phosfon-S at a concentration of 1.3 X 10-5 M or 6.5 X 10-5 M. After soaking, the seeds were rinsed with distilled water and planted in 30 X 28 X 11 cm plastic trays filled two-thirds full with a 1:1 mixture of Vermiculite and Perl-loime wetted with 2-liters of distilled water. Seeds were planted at a depth of 4 cm, approximately 50 seeds per tray. The planted trays were placed in a growth chamber

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“…A number of investigators have emphasized that the response of plants to the growth retardants tends to be the opposite of that to gibberell-ins, and have shown that the effects of the retar plants can be overcame by treatment with gibberellins (GAs) (1,7,14,16,17,18). Lockhart (7) has proposed, on the basis of kinetic studies, that the retardants are genuine GA antagonists, exerting their effect by reducing the activity of GA in plant tissues in a specific manner.…”

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“…Lockhart (7) has proposed, on the basis of kinetic studies, that the retardants are genuine GA antagonists, exerting their effect by reducing the activity of GA in plant tissues in a specific manner. 1 Received July 27, 1964.…”

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confidence: 99%