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Discovery of wild tetraploid sweetpotatoes

Descubrimiento de la batata [Ipomoea batatas (L.) Lam.] tetraploide silvestre

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Abstract

Specimens in the germplasm collection at the U.S. Vegetable Laboratory, United States Department of Agriculture (USDA) in Charleston, SC, were studied to examine phylogenetic relations of the tetraploid accessions inIpomoea sectionBatatas. This collection contains tetraploidsfrom a wide geographic range and most were tentatively identified by the collector asI. trifida. This study shows that corolla and sepal traits may be used to distinguish the tetraploidsfrom known specimens ofI. trifida (diploid) andI. batatas (hexaploid). All but one tetraploid accession examined (CH67.50) had corolla tubes and sepals shaped likeI. batatas and more closely resembled that species thanI. trifida. Use of corolla tube diameter allowed the hexaploidI. batatas and tetraploid accessions to be distinguished fromI. trifida because the corolla tubes were wider immediately above the calyx. Differences in sepal shape were quantified using the angle at the sepal apex. This angle was consistently obtuse in theI. batatas hexaploids and the tetraploids, but was acute in theI. trifida accessions. Due to similarities in sepal and corolla traits, these tetraploids should be reidentified as tetraploidI. batatas, a cytological race of the hexaploid I. batatas (the sweetpotato).

Zusammenfassung

El banco de germoplasma del Laboratorio Vegetal U.S. del Departamento de Agricultura de los Estados Unidos en Charleston, S.C., en su colección posee especímenes de entradas tetraploides deIpomoea batatas (identificadas comoIpomoea trifida,) con amplia distributión geográfica. El objetivo príncipal del presente estudiofue verificar la relatión filogenética de las entradas tetraploides con especímenes deI. batatas (hexaploide) eIpomoea trifida (diploide). Las características relacionadas a la forma y tamaño del corola y los sepalos fueron considerados para diferenciar tetraploides, diploides, y hexaploides. La forma del sepalo y tubo de la corola de la mayoría de tetraploides, excepto la entrada CH67.50, poseen estrecha similitud con la batata cultivada diferenciandosé deIpomoea trifida. Para cuantificar las diferencias en el tamaño de corola fue considerado el diámetro del tubo. Así, la batata cultivada y las entradas tetraploides se diferencian deI. trifida debido al ensanchamiento del tubo de la corola sobre el cáliz. Asímismo, para cuantificar las diferencias en la forma de sepalo fue considerado la forma del ápice. La batata cultivada y las entradas tetraploides poseen forma considerablemente obtusa mientras queI. trifida posee forma aguda. Debido a las similitudes entre tetraploides y hexaploides en la forma y tamaño de sepalo y corola, los tetraploides serían re-identificados como I. batatas tetraploide, considerandosé como una raza citológica de la batata cultivada.

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Authors and Affiliations

  1. United States Department of Agriculture, Agricultural Research Service, U.S. Vegetable Laboratory, 2875, srSavannah Highway, 29414, Charleston, SC, USA

    Janice R. Bohac

  2. Department of Biological Sciences, Florida Atlantic University, 33431, Boca Raton, FL, USA

    Daniel F. Austin

  3. United States Department of Agriculture, Agricultural Research Service, U.S. Vegetable Laboratory, 2875 Sava.inah Highway, 29414, Charleston, SC, USA

    Alfred Jones

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  1. Janice R. Bohac
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  2. Daniel F. Austin
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  3. Alfred Jones
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Bohac, J.R., Austin, D.F. & Jones, A. Discovery of wild tetraploid sweetpotatoes. Econ Bot 47, 193–201 (1993). https://doi.org/10.1007/BF02862022

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