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Abstract
Butanedioic acid mono-(2,2-dimethylhydrazide) (daminozide) applied to ‘Humble’ blackberries (Rubus arvensis Bailey) 2000, 4000 and 6000 mg/liter at full bloom reduced production and delayed ripening. Daminozide applied 3-weeks after bloom did not affect production or berry size with 2000 and 4000 mg/liter, but ripening was delayed. Production was unaffected when (2-chloroethyl)phosphonic acid (ethephon) at 250 to 4000 mg/liter was applied 1 to 3 days before harvest. Sodium 2,3:4,6-di-0-isopropylidene-2-keto-L-gulonate (dikegulac) at 200 and 2000 mg/liter had no effect on production or harvest season distribution.
Abstract
‘Humble’ blackberry (Rubus arvenis Bailey) extractable ethylene content reached more than 7.0 mg/liter shortly after full bloom and dropped to well under 1.0 mg/liter for the remainder of fruit development. The low ethylene levels during the latter stages of fruit development suggests that blackberries are nonclimacteric. ‘Tifblue’ rabbiteye blueberry (Vaccinium ashei Reade) extractable ethylene was more than 5.0 mg/liter approximately 2 weeks after bloom, declined to near 1.0 mg/liter during green fruit development and peaked at 3.7 mg/liter in reddish-green (ripening) berries. The increased level of ethylene in ripening fruits suggests that rabbiteye blueberries are climacteric.
Abstract
In the paper entitled “Ethylene in Fruits of Blackberry and Rabbiteye Blueberry” by John A. Lipe (J. Amer. Soc. Hort. Sci. 103(1):76-77. 1978) ethylene concentrations in the text are erronously expressed as mg/liter. These units should be ppm of μl/liter
Abstract
In the paper, Ethylene in fruits of blackberry and rabbiteye blueberry by John A. Lipe (J. Amer. Soc. Hort. Sci. 103(1):76-77, 1978), the ethylene concentration in the text expressed as mg/liter should be μl/liter or ppm.
Abstract
Ethylene evolution by detached pecan fruits was measured periodically from mid-season until the completion of shuck dehiscence. Less than 1 µ1 ethylene per kg fresh wt/hr was produced until approximately 1 wk before the initiation of shuck dehiscence, when a maximum rate of almost 20 µ1. per kg/hr was attained. The timing and magnitude of the ethylene peak suggests that ethylene may be a hormonal regulator of dehiscence.
Abstract
Pre-germinated onion (Allium cepa L. cv. New Mexico White Grano) seeds, sown in Olton sandy loam soils at 1.7–7.3°C began to emerge after 7 days compared with 30 days for dry non-germinated seeds. Plant stands were established with pre-germinated seeds 12 days earlier than with non-germinated dry seeded onions. The earlier emergence and more rapid growth achieved by pre-germinated seedlings resulted in 10 to 12 days earlier maturity and a 37.5% increase in bulb diameter at harvest. Increased bulb diameter placed 58% of the yield in the 5.1–7.7 cm (2-3 inch) diameter grade compared to 29% for checks and yield of marketable onions was significantly improved.
Abstract
Treatments of 0, 2% and 4% Folicote in water were applied to runoff at 0, 7 and 16 days after bloom (DAB) on ‘Norgold Russet’ potatoes (Solanum tuberosum L.) grown in the greenhouse. Folicote is a wax emulsion antitranspirant (AT) containing 60% solids. Treatments at 0, 7 and 16 DAB with 2% AT reduced water uptake by >20% for 4, 8, and 14 days respectively, following application. AT treatment at 4% reduced water uptake >40% for 10-14 days. There was no significant reduction of tuber yield even at the higher concentration.
Abstract
Three basic types of blackberries (Rubus spp.) are grown in the United States: 1) erect and semierect, 2) western trailing, and 3) southeastern trailing, commonly called “dewberries” (22).
Abstract
Almost 100% of the large volume of ethylene produced by dehiscing pecan fruits comes from the seed (kernel) suggesting that the responding tissue (the shuck) receives its message to dehisce directly as ethylene made in the kernel.
Abstract
Wheat coleoptile straight growth bioassay of pecan fruit extracts established the presence of growth promoting and inhibiting substances. Indoleacetic acid was tentatively identified as a promoting substance. The growth inhibiting substance(s), possibly abscisic acid, promoted abscission of cotton cotyledonary node explants. The absolute level of growth substances did not appear correlated with the seasonal shedding pattern.