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Article

Evaluation of Wild Potato Germplasm for Tuber Starch Content and Nitrogen Utilization Efficiency

Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Genebank Department, Satellite Collections North, Gross Luesewitz Potato Collections, Parkweg 3a, 18190 Gross Luesewitz, Germany
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Plants 2020, 9(7), 833; https://doi.org/10.3390/plants9070833
Received: 10 June 2020 / Revised: 29 June 2020 / Accepted: 1 July 2020 / Published: 2 July 2020
(This article belongs to the Special Issue Plant Biodiversity and Genetic Resources)
Potato wild relatives provide a considerable source of variation for important traits in cultivated potato (Solanum tuberosum L.) breeding. This study evaluates the variation of tuber starch content and nitrogen utilization efficiency (NutE) in wild potato germplasm. For the experiments regarding starch content, 28 accessions of ten different tuber-bearing wild Solanum-species were chosen, and in vitro plantlets were raised from seeds. Twenty plantlets (= genotypes) per accession were then cultivated in the greenhouse until natural senescence and tuber starch content was determined. The average tuber starch content across all genotypes tested was 21.7% of fresh mass. Contents above 28% of fresh mass were found in 50 genotypes, belonging to the species S. chacoense, S. commersonii, S. jamesii, and S. pinnatisectum. Subsequently, 22 wild genotypes revealing high tuber starch contents and four modern varieties of cultivated potato were studied as in vitro plantlets under optimal and low N supply (30 and 7.5 mmol L−1 N). Low N supply lead to a genotype-dependent reduction of shoot dry mass between 13 and 46%. The majority of the wild types also reduced root dry mass by 26 to 62%, while others maintained root growth and even exceeded the NutE of the varieties under low N supply. Thus, wild potato germplasm appears superior to cultivars in terms of tuber starch contents and N utilization efficiency, which should be investigated in further studies. View Full-Text
Keywords: genetic resources; Solanum chacoense; stress tolerance genetic resources; Solanum chacoense; stress tolerance
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MDPI and ACS Style

Bachmann-Pfabe, S.; Dehmer, K.J. Evaluation of Wild Potato Germplasm for Tuber Starch Content and Nitrogen Utilization Efficiency. Plants 2020, 9, 833. https://doi.org/10.3390/plants9070833

AMA Style

Bachmann-Pfabe S, Dehmer KJ. Evaluation of Wild Potato Germplasm for Tuber Starch Content and Nitrogen Utilization Efficiency. Plants. 2020; 9(7):833. https://doi.org/10.3390/plants9070833

Chicago/Turabian Style

Bachmann-Pfabe, Silvia, and Klaus J. Dehmer. 2020. "Evaluation of Wild Potato Germplasm for Tuber Starch Content and Nitrogen Utilization Efficiency" Plants 9, no. 7: 833. https://doi.org/10.3390/plants9070833

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