Analyzing genotype by environment interaction in potato using yield-stability index

Abstract

The plant breeding program of the National University of Colombia carried out 10 potato regional trials during 1998 and 1999 to evaluate 15 promising potato clones (Solanum tuberosum ssp.andigena). Genotype by environment interaction was analyzed using Kang’s methodology, which links yield performance and phenotypic stability. A MACRO was implemented using the SAS system to obtain yield-stability indices. Shukla’s variance was estimated by restricted maximum likelihood (REML), which allowed handling unbalanced data for both genotypes and replicates. In addition, a multivariate analysis methodology was developed, based on the yield-stability index. This methodology is useful when tuber yield is categorized by size and quality, which is usual in Colombian potato harvests.

Resumen

El programa de mejoramiento en papa, liderado por la Universidad National de Colombia, estableció 10 pruebas regionales durante los años 1998 y 1999 para la evaluatión de 15 genotipos promisoriosde Solanum tuberosum ssp.andigena. Para el analisis e interpretation de la interaction genotipo por ambiente se utilizó la metodologia propuesta por Kang, la cual utiliza un estadístico que reúne la selection por rendimiento y estabilidad fenotipica. Una MACRO en el programa SAS fue implementada para la obtention del indice de rendimiento-estabilidad y la varianza de Shukla estimada por REML (Restricted Maximum Likelihood), la cual permite trabajar con datos desbalanceados tanto para repeticiones como genotipos. Además, se desarrolló una metodología que permitió el análisis multivariado, utilizando como base el índice de rendimiento-estabilidad, lo cual facilita el analisis del rendimiento cuando este se divide en varias categorias, como es el caso del cultivo de papa en Colombia.

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Correspondence to Nelson Estrada.

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Cotes, J.M., Ñustez, C.E., Martinez, R. et al. Analyzing genotype by environment interaction in potato using yield-stability index. Am. J. Pot Res 79, 211–218 (2002). https://doi.org/10.1007/BF02871937

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Additional Key Words

  • Regional Trials
  • Phenotypic stability
  • Restricted Maximum Likelihood