ARTÍCULO
TITULO

Genetic divergence of parents and F2 segregation in grain amaranths.

Ram Milan Pandey    

Resumen

Twenty six accessions of grain Amaranths (Amaranthus hypochondriacus), including both indigenous and exotic introductions, were evaluated in the rabi season (winter crop, November-March). Based on D2 analysis, the accessions were grouped into eleven clusters. Clusters I, II, and III had seven, four, and three accessions, respectively; clusters VII, VIII, IX and X had only one accession in each case. The accession in cluster V had the greatest divergence, closely followed by those of clusters IV and I. The maximum and minimum divergences were revealed between clusters VIII and XI and between II and VII, respectively. The pattern of clustering did not show any relationship with geographic origin. In a study of pattern of F2 segregation in 25 crosses involving 10 parents distributed in six clusters, eight crosses showed high breeding potential. The parents involved in these eight potential crosses showed moderate genetic divergence. Se evaluaron 26 líneas de amaranto para grano (Amaranthus hypochondriacus), incluyendo líneas silvestres y exóticas, durante la estación del rabi (cultivo de invierno en noviembre-marzo). Según los análisis D2, las líneas se diferenciaron once grupos. Los Grupos I, II y III tuvieron siete, cuatro y tres líneas, respectivamente; los Grupos VII, VIII, IX y X solo tuvieron una línea cada uno. Las líneas en el Grupo V tuvo la mayor divergencia, seguido muy cerca por aquellas de los Grupos IV y I. La divergencia máxima y mínima se obtuvo entre los Grupos VIII y XI, y entre los Grupos II y VII, respectivamente. El padrón de agrupamiento no se relacionó con el origen geográfi co de las líneas. Al estudiar el padrón de segragación F2, ocho cruzamientos mostraron un alto potencial de diversidad genética, los que derivaron de 25 cruzamientos que comprometieron 10 padres distribuidos en seis Grupos.

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