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In two experiments, 16 sweet potato genotypes (Ipomoea batatas L.) were evaluated for drought tolerance using the detached - leaf water loss method as reported by Walker and Miller (1986). Dry weight loss was also determined. Differences in the rate of leaf water loss over a 48 hour period were found.
Vardaman had the greatest amount of dry matter loss and the lowest level of water loss. However, no relationship between dry matter loss and water loss was found.
Storage roots of `Jewel', `Centennial' and `Beauregard' were chilled at 5C for 0, 10, 20, 30 or 40 days. After chilling, the roots were placed at 21C for two days to allow hardcore development. Hardcore was measured as weight of root that remain hard after boiling for 45 minutes. Hardcore and fatty acid composition of total lipids were compared for the three cultivars. Hardcore was present at 10 days in both `Jewel ' and `Centennial' and at 20 days for `Beauregard'. Severity of hardcore increased with time of chilling. Linoleic acid content of 'Beauregard ' was higher for the 0, 10, and 20 day sampling periods, and decreased to a level equal to that found in 'Jewel ' and `Centennial'.
Fresh shelled southern peas were dipped in solutions of 15 ppm chlorine, 1.0% Ca, cold H2O or a combination of 15 ppm chlorine and 1.0% Ca. These treatments were compared to a no dip treatment and branching for 70 sec. at 205°F. Polyphenoloxidase (PPO) activity of pea extracts were determined in 5 day intervals for 20 days. Quality evaluations for color changes and texture were also made. PPO activity was the only enzyme that showed an increase in activity with refrigeration time. The blanched peas were lower in quality for a fresh refrigerated product.