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Similarities and Differences in Physiological Responses to ‘Candidatus Liberibacter solanacearum’ Infection Among Different Potato Cultivars

February 2014 , Volume 104 , Number  2
Pages  126 - 133

C. M. Wallis, A. Rashed, A. K. Wallingford, L. Paetzold, F. Workneh, and C. M. Rush

First and third authors: United States Department of Agriculture–Agricultural Research Service San Joaquin Valley Agricultural Sciences Center, Parlier, CA 93648; and second, fourth, fifth, and sixth authors: Texas A&M AgriLife Research, Amarillo 79106.

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Accepted for publication 2 August 2013.

Zebra chip disease (ZC), putatively caused by the fastidious bacterium ‘Candidatus Liberibacter solanacearum’, is a threat to potato growers worldwide. However, little is known about biochemical shifts in different potato genotypes in response to ‘Ca. L. solanacearum’ infection. To address this, ‘Red La Soda’, ‘Russet Norkotah’, and ‘FL 1867’ potato were infected with ‘Ca. L. solanacearum’ 4, 3, 2, and 1 weeks before harvest to observe variability in cultivar responses to ‘Ca. L. solanacearum’ infection. ZC symptoms, ‘Ca. L. solanacearum’ titers, and tuber biochemistry were assessed. Red La Soda tubers exhibited greater symptoms when infected for 4 weeks than Russet Norkotah or FL 1867 tubers. ‘Ca. L. solanacearum’ titers did not vary among cultivars. Tuber levels of amino acids, carbohydrates, and phenolics varied among cultivars but no consistent trends were observed. Individual amino acids and phenolics were greater in FL 1867 than Red La Soda, whereas others were greater in Red La Soda or Russet Norkotah than FL 1867. Most amino acids, carbohydrates, and phenolics were positively associated with infection duration and symptoms regardless of cultivar. Associations between most of the evaluated compounds and ‘Ca. L. solanacearum’ titer were positive in Red La Soda. However, no associations between ‘Ca. L. solanacearum’ quantity and compounds were observed in FL 1867 and Russet Norkotah.

Additional keyword:bacteria.

This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 2014.