Hardcore Development in Sweetpotatoes A Response to Chilling and its Remission as Influenced by Cultivar, Curing Temperatures, and Time and Duration of Chilling

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Abstract
The physiogenic disorder hardcore can be induced in ''Centennial'' and ''Jewel'' sweet potatoes (Ipomoea batatas) by chilling the roots at 1.5-10.degree. C. ''Centennial'' sweet potato roots cured at 27.degree. C developed much less hardcore following chilling than did fleshy roots cured at ambient temperatures (about 15.5.degree. C). ''Centennial'' sweet potatoes cured at 27.degree. C and chilled early in their storage life (Nov.) possess the ability to recover from hardcore, whereas similar fleshy roots chilled later (March) demonstrated only slight recovery capacity. ''Centennial'' sweet potatoes cured at ambient temperatures and exposed to chilling temperatures in Jan. and March exhibited some corrective capacity in Jan. Although the susceptible ''Centennial'' cultivar exhibited little or no such capacity in March, ''Jewel'' sweet potatoes still recovered from hardcore at that late date. The development or disappearance of the hardcore symptom appeared to be related to modification of the pectic substances of the root tissue, in particular, protopectin.

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