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- Author or Editor: C. R. Barmore x
- HortScience x
Abstract
A pectolytic enzyme facilitates the large-scale separation of citrus seed, used for rootstock propagation, from a seed-pulp mixture. The enzyme degrades the pulp via pectin breakdown that allows the seed to be collected by sieving. Seed from all citrus rootstock cultivars tested could be separated by this technique with no detrimental effect on germination.
Abstract
Changes in pectinesterase activity and in the 3 pectic fractions of avocados (Persea americana Mill. cv. Lula) during ripening were investigated at 21.1° and 10°C storage. Decrease in pectinesterase activity just prior to softening was very rapid, and when softening occurred, this activity became minimal Tissue softening during storage was accompanied by a general increase in water-soluble pectin and a drop in ammonium oxalate- and sodium hydroxide-soluble pectins.
Abstract
The time required to degreen Florida ‘Bearss’ lemons can be greatly reduced by the use of 1 to 10 ppm ethylene at 25 or 30°C. Degreening was accomplished in 2 to 3 days instead of the 2 to 3 weeks required with the current commercial practice of cool coloring at 15° without ethylene. Applications of a benzimidazole fungicide (thiabendazole, benomyl) prior to degreening adequately controlled decay. Rapid degreening with ethylene at higher temperatures (25° or 30°) eliminates the need for cool coloring storage and brings lemon availability more nearly in phase with consumer demand.
Abstract
Chilling injury (CI) of ‘Marsh Seedless’ grapefruit was reduced by a preharvest spray of benomyl (Benlate) but not of Vapor Gard (VG) pinolene antitranspirant Postharvest treatments with benomyl and thiabendazole (TBZ) also reduced CI. The effect of high CO2 atmospheres (up to 20%) induced under 0.0254 mm (1 mil) PVC film varied sharply with picking date. CI was almost eliminated in such atmospheres in early and midseason pickings but accentuated in the late (postbloom) picking. Modified atmospheres tended to increase decay regardless of picking date.