Studies on the Phytostatic Action of 2:4‐dichlorophenoxyacetic Acid and Coumarin

Audus, L. J.

doi:10.1111/j.1469-8137.1948.tb05100.x

Cited by 36 publications

(11 citation statements)

References 16 publications

(14 reference statements)

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“…These authors grew maize seedlings in tubes with dripping solution. Audus (1948) used a similar melhod with circulating solution. Such methods provide several advantages over tbe usual nietiiods.…”

Section: Methodsmentioning

confidence: 99%

The Inhibitory Effect of Oxygen on the Growth of Wheat Roots

Eliasson

1958

Physiologia Plantarum

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Section: Methodsmentioning

confidence: 99%

The Inhibitory Effect of Oxygen on the Growth of Wheat Roots

Eliasson

1958

Physiologia Plantarum

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“…Few reports are available on the measurement at short time intervals of herbicide-treated intact seedling roots. Audus (1948) observed 2,4-D-treated pea root growth at hourly intervals, and discovered that the rate of root inhibition was directly correlated with 2,4-D concentration. Behrens & Morton (1960) measured mesquite seedling roots 4 and 6 h after application of 2,4-D to the cotyledons, and found no inhibition after 4, but 38% reduction after 6 h.…”

Section: Introductionmentioning

confidence: 99%

Studies on the rate of root growth of intact seedlings in a herbicide medium

O’Sullivan

Prendeville

1974

Weed Research

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Resume: ZusammenfassungTime-lapse cine photography was used to measure at 10-min intervals over 72 h the growth rate of pea and barley roots during separate exposure of the shoot + seed, root or entire seedling to eight herbicides. Times for commencement of root inhibition were determined at exposure to concentrations causing 50 % inhibition in 72 h.Root growth rate was normal in both species during shoot + seed treatment. Root inhibition commenced at the same time in a given species, when only the root or the entire seedling were treated with a particular herbicide. Except for dinoseb, times for commencement of root inhibition differed between pea and barley and between each herbicide. In pea these times ranged from t2 5 h with diuron to 23-7 h with diphenamid, and in barley from tl-1 h with diphenamid to 21-3 h with EPTC. Root growth ceased in only a few cases during the experimental period.EPTC, diphenamid, dinoseb, and trifluralin (on barley only) effectively inhibited root elongation, whereas diuron, simazine, paraquat, dalapon, and trifluralin (on pea only) had no direct effect on root growth at normal field rates of application. Etudes sur le taux de croissance des racines de plantules intactes dans un milieu herbicideLe cin6ma avec prise de vue image par image, k des intervalles de 10 minutes, a 6t6 utilis6 pour mesurer, pendant 72 heures, le taux de croissance des racines de pois et d'orge, soumises k l'action de huit herbicides, en traitant s6par6ment soit l'ensemble pousse + semence, soit la racine, soit la plantule entifere. On a d6termin6 les dur6es d'apparition de l'inhibition des racines, en utilisant des concentrations provoquant 50% d'inhibition en 72 heures.Le taux de croissance des racines fut normal chez les deux especes pendant le traitement pousse + semence. L'inhibition des racines commenfa au mSme moment chez une espfece donn6e lorsque les racines seules ou la plante entiere furent trait6es avec un herbicide particulier. Les dur6es d'apparition * Present address:

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“…Two others were shown to be scopoletin (6-methoxy-7-hydroxy coumarin) and a scopoletin glycoside. Coumarin and its derivatives, along with other unsaturated lactones, have been shown to have considerable physiological activity (Veldstra and Havinga, 1945), including the property of inhibiting root growth (Audus, 1948). Therefore, the presence of scopoletin and its glycoside in the differentiating and mature portions of the root and its absence from the meristem suggested the possibility that these compounds might have a growthregulating function in the root.…”

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confidence: 99%