Effects of High Humidity on Translocation of Foliar-applied Labeled Compounds in Plants. II. Translocation from Starved Leaves

Clor, M. A.; Crafts, A. S.; Yamaguchi, Shogo

doi:10.1104/pp.38.5.501

Cited by 24 publications

(7 citation statements)

References 9 publications

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“…In both experiments, however, movement, expressed as a fraction of uptake, was increased at a high humidity. This agrees with the results of Clor et al (1962Clor et al ( , 1963 who also found increased movement at high humidities using radioactive 2,4-D. It disagrees, however, with the observation of Thrower, Hallam & Thrower (1965) that less damage was caused to broad beans by diquat at a high humidity.…”

Section: Ejfect Of High Humidity On Uptake and Translocationsupporting

confidence: 77%

The Bipyridylium Quaternary Salts

Brian¹

1966

Weed Research

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Summary. In a number of plant species, the biological activity of diquat and paraquat was increased by an increase in environmental humidity. This improved activity resulted from an increase in both uptake and movement. High humidity was more effective after treatment than before it, and durations of 8 hr or more were required to produce the maximum effect. When periods of low humidity of up to 16 hr were interposed between treatment and high humidity, there was no significant effect on the activity of diquat in darkened tomato or sugar beet. The increase in activity occurred both in the dark and in the light, and it is therefore concluded that humidity does not exert its effect by modifying the degree of stomatal opening. Experiments were carried out with wheat using two air humidities combined with different soil moisture contents, ranging from saturated down to only 30% of water‐holding capacity. Greatest movement occurred where high air humidity was combined with low soil moisture, and least where low air humidity was combined with high soil moisture. It is concluded that diquat and paraquat would be most effective in the field when sprayed under dry soil conditions in late afternoon or evening when increased humidity (and darkness) can follow soon after treatment. Les sels quatemaires de bipyridylium Effet de l'humidité atmosphérique et de l'humidité du sol sur l'absorption et la migration du diquat et du paraquat dans les plantes

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Section: Ejfect Of High Humidity On Uptake and Translocationsupporting

confidence: 77%

The Bipyridylium Quaternary Salts

Brian¹

1966

Weed Research

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“…The detection of labelled sucrose was surprising, and its mechanism of synthesis from uracil is not understood. Sucrose can be formed from urea (12).…”

Section: Resultsmentioning

confidence: 99%

Comparison of incorporation and metabolism of RNA pyrimidine nucleotide precursors in leaf tissues.

Ross¹

1965

Plant Physiol.

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“…Foliar penetration by 2,4-D (Pallas 1960, Clor et al 1963, Burns et al 1969), amitrole (Herrett and Linck 1961, Clor et al 1963), maleic hydrazide (Zukel et al 1956, Smith et al 1959), diquat and paraquat (Brian 1966), and dalapon (Prasad et al 1962) can also increase with increased relative humidity, but Morton (1966) found little effect of relative humidity on 2,4,5-T absorption, as did Went and Carter (1948) with sucrose absorption.…”

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confidence: 99%

Uptake of Picloram by Eucalypt Leaf Discs

Sands

Bachelard

1973

New Phytologist

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Summary Surfactants markedly increased the uptake of picloram by Eucalyptus viminalis and E. poly‐anthemos leaf discs. The effects of different surfactants and different surfactant concentrations on uptake depended largely on the degree of wetting by the applied solution on the leaf surface. A species‐surfactant interaction was evident with some surfactants, and this was examined in terms of differences in leaf‐surface characteristics between the two species. The effects of surfactants on the leaf surfaces were also observed. The inadequacy of surface tension as a measure of the ability of a solution to wet leaves, and to stimulate herbicide uptake, is discussed.

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Effects of High Humidity on Translocation of Foliar-applied Labeled Compounds in Plants. II. Translocation from Starved Leaves

Cited by 24 publications

References 9 publications

The Bipyridylium Quaternary Salts

The Bipyridylium Quaternary Salts

Comparison of incorporation and metabolism of RNA pyrimidine nucleotide precursors in leaf tissues.

Uptake of Picloram by Eucalypt Leaf Discs

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