At maturity, the fruit of two early maturing orange cultivars, Hamlin and Pineapple (Citrus sinensis [L.] Osbeck), contained more ethylene and abscisic acid than the late maturing Valencia and Lamb Summer (C. sinensis [L.] Osbeck) cultivars. Ethylene (up to 95 nl/l in internal atmosphere) and abscisic (50 mug/kg dry weight flavedo) increased most rapidly in Pineapple, leading to increased cellu...

Abiotic stresses such as drought, heat or salinity are a major cause of yield loss worldwide. Recent studies revealed that the acclimation of plants to a combination of different environmental stresses is unique and cannot be directly deduced from studying the response of plants to each of the different stresses applied individually. Here we report on the response of Arabidopsis thaliana to a c...

Cells of the terrestrial plant species bromegrass (Bromus inermis L.) are not naturally adapted to withstand the hydrostatic pressures encountered in aquatic environments. However, after treatment with the natural plant growth hormone abscisic acid (75 micromolar), bromegrass cells survived a hydrostatic pressure of 101.3 megapascals, approximating the limits of ocean depth (10,860 m). The incr...

The movement of abscisic acid in the cotton explant was investigated by bioassay and radioisotope techniques. The rate of movement was 20 to 30 millimeters per hour with most of the abscisic acid moving unchanged through the explant into the basal agar. The rate of movement was the same through the abscission zone as through petiole tissue. Patterns of accumulation and metabolic products are di...

The germinatioil of seed can be controlled by ap)plication of exogenous hormones at physiological concenitrations. It is therefore possible that the n-atural control of germination involves an interplay of hormones, both promoters and inh,,ibitors. WXe have shown that cytokinins overcome the inhibitoryaction of several natural inhibitors in the germination of the photosensitive Grand Rapids let...

An abscisic acid derivative was formed by reaction with pentafluorobenzyl bromide which allowed highly sensitive detection by gas-liquid chromatography with electron capture detection. In comparison to the methyl ester derivative, the pentafluorobenzyl derivative of abscisic acid was four times more sensitive to electron capture detection and was stable at room temperature in the presence of ul...

Th2 effect of abscisic acid on cotton (Gossypium hirsutuin L. cv. Acala 4-42) and bean (Phaseolus vulgaris L. cv. Red Kidney) explants was 2-fold. It increased ethylene producticn from the explants, which was found to account for some of its ability to accelerate abscission. Absci ic acd also increased the activity of cellulase. Increased synthesis of cellulaso was not du to an increase in agin...