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Maize (Zea mays L.) ear vascular tissue transports nutrients that contribute to grain yield. To assess kernel heritabilities that govern ear development and plant growth, field studies were conducted to determine the combining abilities of parents that differed for kernel-size, grain-filling rates and shoot-size. Thirty two hybrids were derived from large (LG) and small (SM) kernel plants by inter-crossing parents that differed for shoot-size at silking [Long-Shoot (LS) and Small-Shoot (SS)]. Each hybrid was grown in replicatedexperiments at Fargo and Casselton stations, N.D., USA in 2002. Juvenile plant height, leaf number and mature leaf length, number and width were measured to determine leaf area per mature plant. Ear length, diameter, and fresh weight at 7 and 14 days after silking were estimated at early ear development. Compared to LG parents, the SM parents, produced 5 % taller juvenile plants, 3 % more and 7 % larger mature leaves. Compared to LS x LG hybrids, SS x SM hybrids, produced 7 % taller juvenile plants, 3 % wider mature leavesand 2 to 3 % less leaves at juvenile stage. Compared to LS x LS (LG x LG) hybrids, SS x SS (SM x SM) hybrids, also produced 3 % taller mature plants. Shoot-size parents differed in combining abilities for plant growth traits but not for ear-size traits, suggesting that this trait is lowly heritable. Pollen-type parents did not affect early ear development. Le tissu vasculaire de l'epi de mais (Zea mays L.) transporte les nutriments utilises dans le rendement des grains. Pour connaitre l'heritabilite du developpement de l'epi et de la plante, des etudes ont ete conduites au champ pour estimer les aptitudes a la combinaison des parents qui different par la taille des graines, de l'epi et la vitesse de remplissage des graines. Des genotypes ayant de grosses (LG) et de petites (SM) graines ont ete inter croises avec des genotypes ayant de grands [Long-Shoot (LS)] et de petits [Short-Shoot (SS)] epis pour produire 32 hybrides. Chaque hybride a ete seme dans un dispositif 6 x 6 simple lattice a Fargo et Casselton, N.D., USA en 2002. La taille et le nombre de feuilles des jeunes plants, ainsi que la longueur, le nombre et le diametre des feuilles pour determiner la surface foliaire des plantes a maturite ont ete mesures. La longueur, le diametre et le poids frais de l'epi, apres 7 et 14 jours suivant la sortie des fleurs femelles ont permis d'estimer le developpement precoce de l'epi. Compares a LG, les parents SM ont produitles plus grands jeunes plants et les plus grandes feuilles a maturite. Compares a LS x LG, les hybrides SS x SM ont produit les plus grands jeunes plants et les plus larges feuilles a maturite. Compares a LS x LS (LG x LG), les hybrides SS x SS (SM x SM) ont produit aussi les plus grandes plantes a maturite. Les plantes qui different par la taille des epis different egalement dans les aptitudes a la combinaison pour le developpement des plantes, mais pas pour la croissance des epis, indiquant que ce trait a une faible heritabilite. Le type depollen n'a pas affecte le developpement de l'epi. Keywords : Maize, ear, genotype, shoot, USA, Ivory Coast; Mais, epi, genotype, taille, USA, Cote d'Ivoire Agronomie Africaine Vol. 17 (1) 2005: pp. 1-6

Genetic relationship between plant growth, shoot and kernel sizes in maize (<i>Zea mays</i> L.).