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Minimum resources for phenotyping morphological traits of maize (Zea mays L.) genetic resources

Published online by Cambridge University Press:  12 May 2008

Rodomiro Ortiz ,
José Crossa  and
Ricardo Sevilla
Rodomiro Ortiz*
Affiliation:
International Maize and Wheat Improvement Center (CIMMYT), Apartado Postal 6-641, 06600 Mexico DF, Mexico
José Crossa
Affiliation:
International Maize and Wheat Improvement Center (CIMMYT), Apartado Postal 6-641, 06600 Mexico DF, Mexico
Ricardo Sevilla
Affiliation:
Universidad Nacional Agraria, Avendia La Universidad S/N, La Molina, Lima, Peru
*
*Corresponding author. E-mail: [email protected]
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Abstract

The aim of this research was to use variance components to calculate total phenotypic variation for 12 vegetative and reproductive maize traits. A set of 59 accessions, belonging to nine Peruvian highland maize races, were grown at two consecutive planting seasons in 2 years at one inter-Andean site in northern Peru. The trial data provided a means for calculating the variance components using the restricted maximum-likelihood method. The variance components were assumed to be stable while the number of environments and replications varied to simulate phenotypic variation for each trait. The least number of environments and replications, which does not affect the precision of phenotyping, was selected for assessing each trait. Tabulated data provide the number of environments and replications that can be used as a reference for Peruvian highland trials to assess quantitative variation in plant and reproductive traits. The results suggest that fewer environments and replications are needed for reproductive than for plant traits because the former show higher heritability than vegetative traits.

Keywords

ear traitsheritabilityphenotypic varianceplant descriptorsquantitative variationreplication number
Type
Research Article
Information
Plant Genetic Resources , Volume 6 , Issue 3 , December 2008 , pp. 195 - 200
Copyright
Copyright © NIAB 2008

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