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Relationships among the Mexican races of maize
The present study was designed to advance the classification of the Mexican races of maize as part of the process of revising the Razas de Maíz en México by Wellhausen et al. The interrelationships among the races are examined by numerical taxonomy of morphological characters and the comparison of c...
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Published in: | Economic botany 1992-01, Vol.46 (1), p.72-85 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The present study was designed to advance the classification of the Mexican races of maize as part of the process of revising the Razas de Maíz en México by Wellhausen et al. The interrelationships among the races are examined by numerical taxonomy of morphological characters and the comparison of classifications with previous studies. Forty-nine Mexican races, represented by 148 collections, were grown in several locations and seasons in México from 1982 to 1984; 47 characters were measured directly. For the analysis using numerical taxonomy, characters with the ratio$r=[\hat{\sigma}^{2}{}_{r}/(\hat{\sigma}^{2}{}_{re}+\hat{\sigma}^{2}{}_{e})]\geq 3.0$were chosen. Classifications of Mexican races indicate general agreement with the relationships found in previous studies which were based on conventional taxonomic methods and numerical taxonomy. In addition, poorly described races and new types may now be assigned to well defined groups. /// Como parte del proceso de revisión de la obra Razas de Maíz en México de Wellhausen et al., el presente estudio se diseñó con la finalidad de mejorar la clasificación de las razas Mexicanas de maíz. Las interrelaciones se examinaron usando taxonomía numérica de caracteres morfológicos y las clasificaciones se compararon con estudios previos. Se estudiar 49 razas Mexicanas, representadas por 148 colectas típicas, las cuales fueron sembradas en varios ambientes en México de 1982 a 1984. Se midieron un total de 47 caracteres en forma directa; para los análisis de taxonomía numérica, los caracteres se eligieron en base al criterio de Goodman y Paterniani, o sea, todos aquellos caracteres con$r=[\hat{\sigma}^{2}{}_{r}/(\hat{\sigma}^{2}{}_{re}+\hat{\sigma}^{2}{}_{e})]\geq 3.0$. Las clasificaciones obtenidas en el presente estudio concuerdan, en lo general, con estudios previos basados en taxonomía convencional y taxonomía numérica. Adicionalmente, las razas no bien definidas y variantes recientemente descubiertas pueden ahora asignarse a grupos bien definidos. |
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ISSN: | 0013-0001 1874-9364 |
DOI: | 10.1007/BF02985256 |