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United States Department of Agriculture

Agricultural Research Service

Research Project: OPTIMIZING TUBER SET AND SIZE DISTRIBUTION FOR SEED, FRESH, AND PROCESSING MARKETS
2011 Annual Report


1a.Objectives (from AD-416)
Characterize factors that affect the quality or nutritional value of potatoes.


1b.Approach (from AD-416)
Tubers from multiple genotypes will be analyzed for quality or nutritional value. Genotypes with traits useful to the potato industry such as tuber size and set or superior phytonutrients with be characterized. Factors influencing or controlling trait expression, such as molecular, developmental and environmental control will be characterized.


3.Progress Report

Understanding how to manage new cultivars developed by the Tristate Program is critical for the success of new cultivars and adoption by the industry. Premier Russet, GemStar, and Defender were found to differ substantially in their tolerance to cold storage, weight loss during extended storage, and susceptibility to mottling. Gemstar and Premier Russet potatoes have moderate and high resistance to low temperature sweetening (LTS), respectively. In contrast, Defender sweetens and loses processing quality progressively during storage at normal temperatures and has virtually no resistance to LTS. Gemstar accumulates higher levels of sucrose than Premier when stored at low temperatures indicating an inherent difference in sweetening metabolism and the mechanism of resistance to LTS between these genotypes. Mottling is an issue that can arise during storage of the potato crop and we determined that mottled tissue has low starch and dry matter, high asparagine, low protein, high glucose (and thus acrylamide forming potential), and high respiration.Oxygen can become limiting to internal tissues and the disorder can progress to pockets of blackheart in severe cases late in the storage season.This work can potentially lead to different strategies for breeding cold tolerant potato varieties and help new cultivars be adopted by the industry that can be more profitable, protect jobs and potentially require less input than existing cultivars.

This research supports objective 1 of the parent project, "Identify superior germplasm for potato disease- and pest-resistance, phytonutrients, minerals, and determine the extent of natural variation in diverse potato germplasm of select phytonutrients/metabolites".

The project was monitored through phone calls, email and meetings.


Last Modified: 11/26/2014
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