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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 4, No. 4, 1996, pp. 497-501
Bioline Code: cs96092
Full paper language: English
Document type: Short Communication
Document available free of charge

African Crop Science Journal, Vol. 4, No. 4, 1996, pp. 497-501

 en Heterotic patterns of some intermediate maturing Maize germplasm
Worku, Mosisa; Wolde, Legesse; Tolessa, Benti; Mulatu, Kebede & Tulu, Leta

Abstract

A comprehensive hybrid breeding system requires two diverse populations. The source germplasm of the parents of the intermediate maturing hybrids of Ethiopia are genetically divergent, but they are narrow for further improvement. This study was undertaken to synthesise a pair of intermediate maturing broad based heterotic pools and to identify superior heterotic combinations for direct use in the hybrid programme. Germplasm from East Africa and CIMMYT populations were used in the study. Parents of BH-140, i.e., Gutto LMS-5 and SC-22, were used as testers. The trial was organised and tested in a randomised complete block design at Bako, Awassa, Jimma and Arsi-Negele in 1994. General combining ability (GCA) and specific combining ability (SCA) effects for grain yield were calculated according to the Line x Tester analysis. A number of crosses outyielded BH-140, and significant differences were observed for the effects of SCA. The CIMMYT populations had better heterosis with SC-22 than with Gutto LMS-5. Based on the cross data the maize germplasm were grouped into a pair of heterotic pools. These pools may serve as source germplasm for the development of intermediate maturing maize varieties for the medium altitude areas of East Africa with sufficient rainfall.

Keywords
Combining ability, heterotic pattern, maize, Zea mays L.

 
 fr
Worku, Mosisa; Wolde, Legesse; Tolessa, Benti; Mulatu, Kebede & Tulu, Leta

Résumé

Une reproduction complete du systeme des hybrides exige deux diverses populations. La source du germoplasme des parents des hybrides intermediaires en maturite sont genetiquement divergents en Ethiopie, mais ils sont limites aux ameliorations ulterieures. Cette etude a ete initiee pour synthetiser une paire des especes heterotiques intemediaires et identifier les combinaisons des heterotiques superieurs pour l'usage immediat dans le programme des hybrides. Le germoplasme d'origine de l'Afrique de l'Est et les populations CIMMYT etaient utilises dans la recherche. Les parents du BH-140, comme Gutto LMS5 et SC-22, etaient utilizes comme agents testeurs. L'essai etait organise et teste au hasard dans le bloc a Bako, Awasa, Jimma et Arsi-Negela en 1994. La capacite generaie d'associer (General Combining ability: GCA) les effets des rendements des graines etaient calcules d'apres la ligne X du Testeur d'analyse. Un certain nombre de BH-140 ou rendement a ete enregistre, et l'on a constate de differences remarquables quant aux effets du SCA. Les populations du CIMMYT avaient de meilleurs heterogenes associes aux SC-22 par rapport au Gutto LMS-5. Base sur les donnees de croisement du germoplasme du mais, on les a groupe dans une source des heterotiques. Ces etangs ou sources peuvent servir comme source de germoplasme pour le developpement des varietes intermediaires du mais a l'etape de maturite pour les terrains d'une altitude moyenne en Afrique de l'Est avec une abondance de pluie.

Mots Clés
Asocier la capacite, echantillon heterotique, le mais, Zea mays L.

 
© Copyright 1996 - African Crop Science Society

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