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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 4, No. 3, 1996, pp. 275-281
Bioline Code: cs96066
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 3, 1996, pp. 275-281

 en Genetic analysis of tassel size and leaf senescence and their relationships with yield in two tropical Lowland maize populations
Guei, R.G. & Wassom, C.E.

Abstract

Primary tassel branch number, tassel weight, and leaf
senescence are among plant traits which affect maize plant
yielding efficiency. Two random mating tropical maize
populations were used to estimate genetic components of
variance and heritability, and to quantify the amount of
genetic variability.  Full-sibs within half-sib groups were
developed using the mating Design I, and were evaluated at two
locations for 2 seasons in Mexico.  Results showed that large
amounts of genetic variability were present in both
populations for all traits. Additive genetic variance was
greater in magnitude than dominance variance. Negative
phenotypic and genotypic correlations were found between
tassel size, leaf senescence, and yield.  Selection based on
these traits may be appropriate for increased yield. Overall,
the inheritance of the traits measured depended on the genetic
background of the population and the environmental conditions.

Keywords
Additive variance, dominance variance, genetic variability, heritability, leaf senescence, tassel size

 
 fr
Guei, R.G. & Wassom, C.E.

Résumé

Le nombre d'embranchements primaires de la fleur male, leur
poids  et la senescence des feuilles  font parti des
caracteristiques de la plante de  mais qui affectent
l'efficience du rendement. Deux populations de mais d'origine
tropical croisees au hasard ont ete utilisees pour estimer les
composantes de la variance genetique et de l'heritabilite, et
pour quantifier l'ordre de grandeur de la variabilite
genetique. Des groupes de vrais freres a l'interieur des demis
freres ont ete developpes en utilisant le dispositif I de
croisement, et ont ete evalues dans deux localites pendant
deux saisons au Mexique. Les resultats demontrent que la
variabilite genetique etait elevee dans les 2 populations pour
toutes les caracteristiques mesurees. Mais la variance
genetique additive etait plus elevee que la variance du type
dominant. Les correlations phenotypiques et genotypiques
etaient negatives entre les caracteristiques mesurees et le
rendement. La selection basee sur ces caracteristiques
pourrait ameliorer le rendement, et leur transmission  serait
fonction du determinisme genetique de la population et des
conditions environnementales.

Mots Clés
Heritabilite, variabilite genetique, variance additive, variance dominante, senescence des feuilles

 
© Copyright 1996 - African Crop Science Society

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