Activation and Inhibition of Indoleacetic Acid Oxidase Activity from Peas

Sondheimer, Ernest; Griffin, David H.

doi:10.1126/science.131.3401.672

Cited by 51 publications

(15 citation statements)

References 9 publications

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“…Recent investigations on the inhibition or activation of in vitro enzyme systems have emphasized the contrasting action of phenylpropane derivatives differing only in their hydroxylation patterns (20 to interpret small changes in the level of phenylpropane derivatives in plants of such different developmental condition. Leaves are the site of perception of most photoperiodic stimuli in mature plants, and dried powders of one-half to three-fourths expanded Xanthium leaves also showed 3 to 4 times higher levels of phenylpropane derivatives than "whole plant" powders.…”

Section: Resultsmentioning

confidence: 99%

Some Effects of Photoperiod on the Biosynthesis of Phenylpropane Derivatives in Xanthium

Taylor¹

1965

Plant Physiol.

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in this report that C. nocturnum is both LD and LSD in its responses and that the previously reported critical day length is for the LD responses while the LSD response has a critical day length of between 12 and 16 hours.This more clearly defining of the 2 responses in C. nocturnum brings into focus the previously suggested questions as to whether a single hormone can he synthesized as a result of more than 1 stimulus, and if a plant can respond to more than 1 hormone (2). One of the approaches that may give further information concerning the nature of the responses is through the study of hybrids of C. nocturnum with closely related species. Such an investigation is in progress. SummaryPhotoperiods were investigated in Cestrumit diurnurn L. and Cestrum nocturnum L. C. nocturnum responded to long-short day, short-long day, and long day treatment. The critical day length in the longshort day response was between 12 and 16 hours, while the critical day length in the short-long day and long day response was between 8 and 12 hours. The short-long day response occurred at a younger age than the long day response. C. diurnum plants with 3-month-old shoot systems responded to long-short day treatment with a critical day length between 12 and 16 hours. Plants with 6-month-old shoot systems grown on constant light produced floral primordia when transferred to a 16-or 18-hour photoperiod. Plants maintained on an 8-hour photoperiod started to bloom in from 30 to 50 weeks and continued for the duration of the experiment. These data suggest that C. nocturnum is both a long day and long-short day plant and C. diurnum is a short day plant, with both species producing floral primordia in younger plants when grown on a noninductive photoperiod and transferred to an inductive photoperiod.Literature Cited

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Section: Resultsmentioning

confidence: 99%

Some Effects of Photoperiod on the Biosynthesis of Phenylpropane Derivatives in Xanthium

Taylor¹

1965

Plant Physiol.

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“…There are increasing numbers of reports of both st'imutlating and inhibiting effects of phenolic compounds on enzymes (1,4,10,18 With xantha muitant discs, allaggDchrolme and chlorogenic acid valties increased during dark incubation (see table IV). Net light effecits were negative for allagochrome, while for chlorogenic acid the smal,l positive effects with sucrose anid fructose were not statistically significant.…”

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confidence: 99%

Allagochrome II. Effects of Light and Substrate on Allagochrome and Chlorogenic Acid Levels of Incubated Sunflower Leaf Discs

Habermann¹

1967

Plant Physiol.

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Summary. Sunflower leaf discs incubated in ithe light oln carbohydrate substrates exhibit several-fold increases in amounts of extractable allagochrome and chlorogen,ic acid. Thes,e changes are linear with time, and oxygen is required. The light effect saturates at approximately 600 UW/cm2 "white" light, roughly the compensation point for photosynthesis. Red 'light is as effective as white light. Incubation in the dark, or in far red light, produces negligible changes 'in allagochrome and chlorogenic acid conten't.

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“…The immediacy of the response to light wNould appear to minimize a role for synthesis or destruction of cofactors of the type described by Mumford et al (19) or Furuya et al (10). Rather the levels of other regulatory compounds, such as phenols (13,20,25,26,32,37) which might be readily altered by abrupt, 1 or 2 step changes in oxidation or reduction, appear to be a more useful system to explore.…”

Section: Introductionmentioning

confidence: 99%

Metabolism of Indoleacetic Acid in Rust Diseases. I. Factors Influencing Rates of Decarboxylation

Daly

Deverall

1963

Plant Physiol.

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Activation and Inhibition of Indoleacetic Acid Oxidase Activity from Peas

Cited by 51 publications

References 9 publications

Some Effects of Photoperiod on the Biosynthesis of Phenylpropane Derivatives in Xanthium

Some Effects of Photoperiod on the Biosynthesis of Phenylpropane Derivatives in Xanthium

Allagochrome II. Effects of Light and Substrate on Allagochrome and Chlorogenic Acid Levels of Incubated Sunflower Leaf Discs

Metabolism of Indoleacetic Acid in Rust Diseases. I. Factors Influencing Rates of Decarboxylation

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