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Genetic Resources and Crop Evolution

, Volume 59, Issue 6, pp 1015–1026 | Cite as

Effects of domestication on structural polysaccharides and dietary fiber in nopalitos (Opuntia spp.)

  • Cristian López-Palacios
  • Cecilia Beatriz Peña-ValdiviaEmail author
  • J. Antonio Reyes-Agüero
  • Adriana Inés Rodríguez-Hernández
Research Article

Abstract

Domestication is an evolutionary process that modifies morphological, physiological, chemical and genetic features of wild plants, and is a product of artificial selection. A gradient of domestication can be appreciated in species of the Opuntia genus. There are wild species like O. streptacantha, others semi-domesticated like O. hyptiacantha O. megacantha and O. albicarpa, or other like O. ficus-indica with the highest degree of domestication. At the same time, some structural polysaccharides have been associated with plant drought and freeze resistance. This study aimed at quantify five groups of structural polysaccharides in 14 variants of nopalitos (edible young cladodes of flat-stemmed spiny cacti consumed as vegetables) of Opuntia spp. in a domestication gradient. Given that extreme environment is less frequent under cultivation than in the wild, we hypothesized that structural polysaccharides in nopalitos are reduced throughout the domestication process. The experiment was conducted as a completely randomized design with a 5 × 14 two-factor factorial treatment structure, with four replications. Mucilages, pectins, hemicelluloses and cellulose were extracted and dietary fiber content was calculated. ANOVA of data was performed, pair wise comparisons of species and variants were conducted by Tukey test and principal components analysis was carried out. Mucilages were higher in O. ficus-indica (12% of total dry mass) and pectins, loosely and tightly bound hemicelluloses in O. streptacantha (2.5, 9 and 3%, respectively). All five species had similar content of cellulose (5.1% dry mass); but, O. streptacantha presented more dietary fiber. Higher pectins and both loosely and tightly bound hemicelluloses content in wild species can be related to genotype and the persistence of reaction to a wild environment. Mucilages which are one of the main characteristics of consumer preference and loosely bound hemicelluloses could have impact for selection during Opuntia domestication.

Keywords

Cacti Cellulose Dietary fiber Domestication Hemicelluloses Mucilage Opuntia spp. Pectins 

Notes

Acknowledgments

The first author was awarded Consejo Nacional de Ciencia y Tecnología scholarship for undertaking his M. Sc. program. Sarah Kohl reviewed the English version.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Cristian López-Palacios
    • 1
  • Cecilia Beatriz Peña-Valdivia
    • 1
    Email author
  • J. Antonio Reyes-Agüero
    • 2
  • Adriana Inés Rodríguez-Hernández
    • 3
  1. 1.Botánica, Colegio de PostgraduadosCampus MontecillosMéxicoMéxico
  2. 2.Instituto de Investigación de Zonas DesérticasUniversidad Autónoma de San Luis PotosíSan Luis PotosíMéxico
  3. 3.Centro de Investigaciones en Ciencia y Tecnología de los AlimentosUniversidad Autónoma del Estado de HidalgoTulancingoMéxico

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