Studies on the leaf abscission by chemical injury (3)

Leaf Abscission Induced by the Iodide Ion.

In the course of biological screening for herbicidal activity in synthetic compounds, various organic iodide complexes had marked defoliating properties when applied to leguminous test plants. Simple iodides such as the salts of alkali metals also caused defoliation. Although this effect has been reported in the patent literature (4, 8), our present investigation was undertaken principally to l...

Effects of some salts and acids on citrus leaf abscission

Ethylene-induced Leaf Abscission Is Promoted by Gibberellic Acid.

Gibberellic acid (GA(3)) promoted leaf abscission from cotton (Gossypium hirsutum L.) plants exposed to ethylene. With mature plants, only the rate of abscission was increased, but when vegetative plants were exposed to ethylene for 4 days or less, the amount of abscission was increased markedly. Promotion of abscission occurred at near saturating ethylene levels (10 mul/liter), over a wide ran...

Regulation of Ethylene Evolution and Leaf Abscission by Auxin.

Many physiological processes have shown art,.lowith a neck to accommodate a 25 mm diameter Sgous responses to both auxin and ethylene. These rubber vaccine cap. The gas collection bottles were processes include root initiation, intumescence formathen sealed and incubated at 21'; etiolated tissue was tion, epinasty (9), fruit ripening (3, 12), floral placed in the dark and green tissue in 150 ft...

Chemical studies on plant leaf movement controlled by a biological clock*

Most leguminous plants close their leaves in the evening, as if to sleep, and open them early in the morning according to the circadian rhythm controlled by a biological clock. Extensive studies on nyctinastic plants led to the isolation of a variety of leaf-closing and -opening substances. And we found that the biological clock regulates the balance of concentration between leaf-opening and -c...