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Seok-Kyu Jung, Jacqueline F. Nock, and Chris B. Watkins

Late-harvested apple fruit generally are less responsive to 1-MCP than early harvested fruit, but the effect of harvest date on these responses can vary greatly by cultivar. Little is known about the relationships between internal ethylene concentration (IEC) and responses of fruit to 1-MCP. We have investigated the effects of 1-MCP on `McIntosh', `Cortland', and `Empire' apples in two experiments. In the first, fruit of each cultivar were picked three to five times during the normal harvest season, untreated or treated with 1 μL·L-1 1-MCP, and stored in air. Fruit IEC and firmness were then measured at monthly intervals for 4 months. In the second experiment, fruit were harvested several times during maturation, and, at each harvest, fruit were categorized into groups based on their IEC (<0.5, 0.5–1.0, 1–10, 10–50, 50–100; and >100 μL·L-1), treated with 1 μL·L-1 1-MCP for 24 hours at room temperature, and stored in air. The IEC and firmness of each fruit was then measured at set intervals during storage. Increasing IECs were associated with declining effectiveness of 1-MCP, but the individual fruit study showed that, even in high-IEC fruit, there was an initial inhibition of IEC values during storage before the IECs increased. A Lower IEC at harvest indicated a longer delay before the IEC ultimately increased. Collectively, the data show that it should be possible to determine the response of fruit to 1-MCP based on their IEC.

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Steven J. McArtney, John D. Obermiller, Tom Hoyt, and Michael L. Parker

room at 0 °C. Samples two and three were held in the same room at 0 °C in ambient atmosphere after postharvest 1-MCP treatment for 30 d and then held at 20 °C for 7 d before measuring internal ethylene concentration (IEC) and flesh firmness. IEC was

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Max G. Villalobos-Acuña, William V. Biasi, Sylvia Flores, Elizabeth J. Mitcham, Rachel B. Elkins, and Neil H. Willits

to 60 min. The headspace gas was analyzed for CO 2 and ethylene concentrations using rapid gas analysis (VIA510; Horiba, Fukuoka, Japan) and flame ionization gas chromatography (Model 211 Series S; Hach-Carle Co., Fullerton, CA) using two columns (1

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Nihad Alsmairat, Philip Engelgau, and Randolph Beaudry

3 and 4 and declined thereafter as sugar spots formed. Fig. 2. Internal ethylene concentration, internal O 2 fraction, internal CO 2 fraction, and peel lightness, chroma, and hue of ‘Cavendish’ banana fruit at different fruit ripening stages. The

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Christopher B. Watkins and Jacqueline F. Nock

and ethanol concentrations of the fruit were measured in Expt. 2. The IEC of each fruit was measured on 1-mL samples of internal gas from the core cavity ( Watkins et al., 2000 ). Ethylene was measured using a Hewlett-Packard 5890 Series II gas

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Yosef Al Shoffe, Abdul Sattar Shah, Jacqueline F. Nock, and Christopher B. Watkins

·L −1 in conditioned fruit compared with 6.0 µL·L −1 in unconditioned fruit ( P < 0.001). Fig. 1. Internal ethylene concentration (IEC) in ‘Honeycrisp’ apples stored at 0.5 °C (no conditioning) or 10 °C for 7 d (conditioning) ( A ), and then stored at

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Jinwook Lee, James P. Mattheis, and David R. Rudell

at 3 °C compared with 0.5 °C and less in 1-MCP-treated fruit compared with controls. Table 1. Internal ethylene concentration (IEC), I AD , and difference in fruit fresh weight and circumference from harvest through storage and shelf life for ‘Royal

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Don C. Elfving, Stephen R. Drake, A. Nathan Reed, and Dwayne B. Visser

before applications and again after each weekly drop count. Parameters of fruit quality [flesh firmness, skin color, flesh color, soluble solids content (SSC), titratable acidity (TA), starch index (SI), and internal ethylene concentration (IEC)] were

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Jinwook Lee, In-Kyu Kang, Jacqueline F. Nock, and Christopher B. Watkins

internal ethylene concentrations (IECs), chlorophyll content (in terms of I AD values), and starch hydrolysis of ‘Gala’ apples ( Doerflinger et al., 2015a ). Preharvest 1-MCP applications reduced the incidences of soft scald and soggy breakdown in

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Gregory M. Peck, Ian A. Merwin, Christopher B. Watkins, Kathryn W. Chapman, and Olga I. Padilla-Zakour

each year. At each harvest, a 10-fruit subsample was selected from each plot for measurements of percent surface blush, internal ethylene concentration (IEC), flesh firmness, SSC, starch index rating, and TA. Comparisons of sensory, mineral