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Abstract
The volatile substances, carbon dioxide, ethylene, acetaldehyde, ethyl acetate, ethyl alcohol, ethyl propionate, ethyl-n-butyrate and caproaldehyde produced by the fruit from 4-year-old ‘McIntosh’ apple trees on EM 26 rootstocks in sand culture supplied with 3 levels of P and 2 levels of K in factorial combination were studied by infrared gas analysis and gas chromatography. Increased P supply increased the rate of ethylene production from apples stored for both 111 and 158 days, reduced the output of most of the other volatiles, and increased the levels of scald and core-browning. Increased K supply had little effect other than to decrease the C2H4 production in the 111-day (January) analysis.
Abstract
Lowbush blueberry plants had greater flower bud formation with more primordial meristems and more advanced floret primordia and lower concentration of anthocyanins in leaves at warmer temperatures than at cooler temperatures.
Abstract
A browning of the stem-cavity region is frequently the first externally visible storage disorder to appear in Mcintosh apples. Stem-cavity brpwning is associated with core browning and is of commercial significance for it may develop after several days at 21°C during marketing (2). A somewhat similar disorder of Sturmer apples, stalk-end scald, was reported to preferentially affect terminal apples and to be controlled by scald inhibitors (3). Casual observation suggested that both size and position in the blossom cluster influenced development of stem-cavity browning of Mcintosh apples.
Abstract
Outward diffusion of CO2 from ‘Stevens’ and from native seedling cranberries (Vaccinium macrocarpon Ait.) collected in 1971 and held 6 months at 3°C proceeded at the rate of 4.55 and 2.56 μl/cm2-hr, respectively. The rate of movement of O2 into ‘Stevens’ was 2.64 and for a native seedling was 3.28 μl/cm2-hr. For cranberries collected in 1972 and held 1 month at 3°C the respective values for CO2 were 1.48 and 1.53 and for O2 they were 3.09 and 3.65 μl/cm2-hr.
Abstract
Nectar from flowers of the lowbush blueberry, Vaccinium angustifolium Ait was found to evolve acetaldehyde at a rate of approx 0.047 μg/g nectar/hr and ethyl alcohol, the only other volatile detected, in smaller amounts.