Chromosome number of theOxalis tuberosa alliance (Oxalidaceae)

Azkue, Daniel de; Martínez, Arturo

doi:10.1007/bf00935981

Cited by 26 publications

(13 citation statements)

References 10 publications

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“…3), with one exception: the character that groups O. spiralis with O. mollissima on the GS tree conflicts with the character that groups O. spiralis, O. longissima, and O. sp ''O'' on the ITS tree (this last is designated site ''b'' in Emshwiller and Doyle, 1998a). The ncpGS results contribute additional evidence to that found previously with ITS for the naturalness of the group that includes the known x ϭ 8 species (see Emshwiller and Doyle, 1998a;de Azkue and Martínez, 1990). The general congruence also supports the conclusion that the ncpGS sequences sampled here are orthologous.…”

Section: Comparison Of Gene Trees For Ncpgs and Itssupporting

confidence: 86%

Chloroplast-Expressed Glutamine Synthetase (ncpGS): Potential Utility for Phylogenetic Studies with an Example from Oxalis (Oxalidaceae)

Emshwiller

Doyle

1999

Molecular Phylogenetics and Evolution

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Section: Comparison Of Gene Trees For Ncpgs and Itssupporting

confidence: 86%

Chloroplast-Expressed Glutamine Synthetase (ncpGS): Potential Utility for Phylogenetic Studies with an Example from Oxalis (Oxalidaceae)

Emshwiller

Doyle

1999

Molecular Phylogenetics and Evolution

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“…The "Oxalis tuberosa alliance" is an informal group of several dozen species from the Central and Northern Andes, first named by de Azkue and Martínez (1990) based on their shared base chromosome number of x=8, which is not found in other members of the genus. Cultivated O. tuberosa is the only octoploid (2n=8x=64) (de Azkue and Martínez 1990) in the alliance, whereas the majority of alliance species are diploid.…”

Section: The Evolutionary History Of Oxalis Tuberosamentioning

confidence: 99%

The Role of Organic Acids in the Domestication of Oxalis tuberosa: A New Model for Studying Domestication Resulting in Opposing Crop Phenotypes1

Bradbury

Emshwiller

2010

Econ Bot

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The Role of Organic Acids in the Domestication of Oxalis tuberosa: A New Model for Studying Domestication Resulting in Opposing Crop Phenotypes. Though few crops display directly opposing domesticated phenotypes, these crops may be the key to understanding domestication processes that address conflicting selective pressures in the agricultural ecosystem. Two relatively well-known examples are cassava (Manihot esculenta Crantz), which has high-cyanide and low-cyanide varieties, and potato (Solanum section Petota). Among the potatoes are several species, including the common potato (Solanum tuberosum L.), that have low levels of glycoalkaloids and there are other species of "bitter potato" with elevated levels of glycoalkaloids. We propose that Oxalis tuberosa Molina, "oca," may represent a third example of such a crop system, with opposing high organic acid and low organic acid cultivars. Each cultivar set has different cultural food preparation practices ("use-categories"), similar to the "use-categories" that have been described for potatoes in the Andes (Brush et al. 1981;Zimmerer 1991). Our initial analyses suggest that organic acids in tubers may be an important biochemical difference between use-categories, based on both oxalic acid and pH data. Here, we review our understanding of organic acids in oca tubers, while highlighting areas that merit further investigation.Los ácidos orgánicos y la domesticación de Oxalis tuberosa: un nuevo modelo para el estudio de la domesticación que resulta en los fenotipos domésticos opuestos. Aunque pocos cultivos presentan fenotipos domésticos directamente opuestos , estos cultivos pueden ser la clave para entender los procesos de domesticación que muestran conflicto en la presión selectiva en el ecosistema agrícola. Dos ejemplos relativamente bien conocidos son la yuca (Manihot esculenta Crantz), que tiene variedades de alto y bajo contenido de cianuro, y la papa (Solanum sección Petota). Entre las papas hay varias especies, incluyendo la papa común (Solanum tuberosum L.), que tienen bajos niveles de glicoalcaloides mientras otras especies como las "papas amargas", tienen elevados niveles de glicoalcaloides. Nosotros proponemos que Oxalis tuberosa Molina, oca, puede representar un tercer ejemplo de este sistema de cultivo, con niveles altos y bajos de ácidos orgánicos. Cada grupo de variedades de oca tiene diferentes practicas culturales respecto a su preparación como alimentos (categorías de uso), similar a las categorías de uso que se han descrito para las papas en los Andes (Brush et al. 1981;Zimmerer 1991). Los análisis iniciales sugieren que los ácidos orgánicos en los tubérculos pueden deberse a una diferencia bioquímica importante entre el uso de categorías basadas en el ácido oxálico y los datos de pH. En este artículo examinamos nuestra interpretación de los ácidos orgánicos en los tubérculos de oca, además de destacar las áreas que merecen mayor investigación.

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“…is an ancient tuber crop of the high Andes (Fano and Benavides 1992;Hermann 1992). A polyploid series with x=8 exists in those species of the Oxalidaceae that are phylogenetically related to oca, and O. tuberosa is the only known octoploid member of this series (De Azkue and Martinez 1990;Valladolid et al 1994).…”

Section: Introductionmentioning

confidence: 96%

Expression of stylar incompatibility in the Andean clonal tuber crop oca ( Oxalis tuberosa Mol . , Oxalidaceae )

Trognitz

Carrión²,

Hermann

2000

Sexual Plant Reproduction

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Long-, mid-, and short-styled clonal accessions of oca (Oxalis tuberosa) were intercrossed in a complete diallelic design. Pollen tube growth in styles was monitored in all diallelic crosses. Pollen fertility was estimated by two tests: staining of pollen grains with aceto-carmine and detection of β-galactosidase activity by the substrate X-Gal. The two methods of pollen fertility estimation were equally useful to detect fertility levels. Pollen originating from short stamens had the highest fertility (85%) and pollen from long stamens had the lowest fertility (70%). Pollen fertility was high throughout, but its degree varied with the stylar morph on which the pollen was formed. Long-styled accessions had the highest rates of fertile pollen. Differences in pollen fertility at different anther levels in the same style morph were also apparent. Pollen grain diameter of the six morph-anther level combinations was inversely correlated with pollen fertility. Pollen grains from long stamens were the largest and pollen grains from short stamens were the smallest. Neither pollen fertility nor pollen grain size had an influence on pollen tube growth in the style or on fruit and seed set. Pollen tubes growing within the styles were inhibited at a different level for each of the 18 cross combinations in the diallel. Although legitimate crosses had greatest pollen tube growth, some of the illegitimate inter-and intramorph crosses had equally high scores. Of all illegitimate crosses, mid-styled seed parents had the lowest level of stylar incompatibility. Fruit and seed set were highly correlated with the extent of pollen tube growth in the style. The number of pollen tubes entering ovules in a flower was in good agreement with the number of seeds produced per fruit. Therefore, it is concluded that stylar incompatibility is the major determinant of limited seed formation in oca even in the most successful legitimate cross combinations.

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Chromosome number of theOxalis tuberosa alliance (Oxalidaceae)

Cited by 26 publications

References 10 publications

Chloroplast-Expressed Glutamine Synthetase (ncpGS): Potential Utility for Phylogenetic Studies with an Example from Oxalis (Oxalidaceae)

Chloroplast-Expressed Glutamine Synthetase (ncpGS): Potential Utility for Phylogenetic Studies with an Example from Oxalis (Oxalidaceae)

The Role of Organic Acids in the Domestication of Oxalis tuberosa: A New Model for Studying Domestication Resulting in Opposing Crop Phenotypes1

Expression of stylar incompatibility in the Andean clonal tuber crop oca ( Oxalis tuberosa Mol . , Oxalidaceae )

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