Temperature-induced changes in potato processing quality during storage are modulated by tuber maturity

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• 作者：Edward P. Driskill (1)
  Lisa O. Knowles (1)
  N. Richard Knowles (1)
  
• 关键词：Solanum tuberosum L. ; tuber maturity ; storage ; processing quality ; temperature ; low temperature sweetening ; cultivars
• 刊名：American Journal of Potato Research
• 出版年：2007
• 出版时间：September 2007
• 年：2007
• 卷：84
• 期：5
• 页码：367-383
• 全文大小：2797KB
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• 作者单位：Edward P. Driskill (1)
  Lisa O. Knowles (1)
  N. Richard Knowles (1)
  
  1. Department of Horticulture and Landscape Architecture, Washington State University, PO Box 646414, 99164-6414, Pullman, WA, USA
  

文摘

Knowledge of how potato (Solatium tuberosum L.) cultivars respond to non-conventional storage temperature regimes may expand options for managing immature, overmature, or otherwise stressed potatoes. Here we demonstrate that temperature-dependent changes in the processing quality of tubers are modulated by tuber maturity. ‘Russet Burbank-(RB), ‘Ranger Russet-(RR), and ‘Umatilla Russet-(UR) tubers from early- and late- planted crops (grown for 163 d and 133 d, respectively) were conditioned for a month at 4.5, 6.7, or 9 C, and subsequently stored at 4.5, 6.7 or 9 C (nine temperature regimes) for an additional 182 d before reconditioning at 16 C. Fry color darkened as conditioning temperature (CT) decreased from 9 to 4.5 C, and tubers were most sensitive to low temperatures for loss of processing quality during the initial conditioning period following wound-healing. Conditioning at higher temperatures increased the tolerance of tubers to lower subsequent holding temperatures (HT) later in the storage season. The processing quality of chronologically older (early planting) RR and UR tubers was inferior to the younger tubers (late planting), resulting in fewer CT/HT combinations for managing the former. Regardless of maturity, RR tubers maintained processing quality for up to 230 d when conditioned and stored at higher temperatures; however, tubers from the late planting had a greater tolerance of lower temperatures than those from the early planting. Although reconditioning improved the processing quality for all cultivars and thus expanded the CT/HT management options, the responsiveness of cold-sweetened UR tubers to reconditioning attenuated over the 230 d storage period, reflecting earlier onset of irreversible senescent sweetening in this cultivar. Chronologically younger tubers of the most dominant processing cultivars in the Pacific Northwest stored better than tubers produced over a prolonged growing season. Collectively, these studies suggest strategies to manage tubers of differing maturity to best preserve processing quality during storage.