search
for
 About Bioline  All Journals  Testimonials  Membership  News  Donations


African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 5, No. 2, 1997, pp. 99-106
Bioline Code: cs97016
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 5, No. 2, 1997, pp. 99-106

 fr
Mushonga, J.N.; Gupta, S.C. & House, L.R.

Résumé

Quatre-vingt cinq entrees du sorgho (Sorgum bicolor (L.) Moench) dont 13 lignees) restauratrices (lignees), 5 lignees de maintenance (testeurs), 65 hybrides F1 , et deux temoins ont ete cultives a Muzarabani, au Zimbabwe pendant les saisons des pluies de 1986/87 et de 1987/88 pour evaluer l' aptitude a la combinaison et l'heterosis pour l'activite diastasique. Les echantillons de grains ont ete evalues pour l'activite diastasique, exprimee en Unite Diastasique du Sorgho (UDS) par gramme de malt, en 1989 . Des differences entre les lignees du sorgho, les testeurs, les hybrides, et les entrees totales etaient significatives pour l'activite diastasique pendant les deux saisons. Il y avait de grandes differences dans les valeurs moyennes de l'activite diastasique et les classes pour les entrees en deux saisons. La moyenne de l'UDS g-1 malt pour les hybrides variait de 20,5 a 67,2 pour la saison 1986/87 et de 13,3 a 48,9 pour la saison 1987/88. La variation de l'activite diastasique etait principalement due a l'action non-additive du gene. Les effets les plus positifs de l'aptitude a la combinaison etaient observes pour la lignee 4HA85S, et le testeur 120 A. Les effets positifs significatifs de l'aptitude specifique a la combinaison etaient observes pour l'hybride 120 A x D 38073-2. Ceci etait le seul croisement qui avait l'heterosis positif des parents superieurs pendant les deux saisons, mais cece etait significatif seulement pendant la saison 1987/88. La plupart des croisements avaient l'heterosis negatif des parents superieurs. Pour ameliorer l'activite diastasique , les procedures de selection recurrente pour l'aptitude specifique a la combinaison doivent etre utilisees pour developper les parents elites pour les hybrides.

Mots Clés
Sorgho, unite diastasique, heterosis, action non-additive du gene

 
 en Combining ability and heterosis for diastatic activity in grain sorghum
Mushonga, J.N.; Gupta, S.C. & House, L.R.

Abstract

Eighty-five sorghum (Sorghum bicolor (L.) Moench) entries including 13 restorer-lines (lines), 5 maintainer-lines (testers), 65 F1 hybrids, and two controls, were grown at Muzarabani, Zimbabwe during the rainy seasons of 1986/87 and 1987/88 to study the combining ability and heterosis for diastatic activity. Grain samples were evaluated for diastatic activity, expressed in Sorghum Diastatic Units (SDU) per gram of malt, in 1989. Differences between sorghum lines, testers, hybrids, and total entries were significant for diastatic activity in both seasons. There were large differences in mean diastatic activity values and ranges for entries in both seasons. The mean SDU g-1 malt for hybrids varied from 20.5 to 67.2 for the 1986/87 season and 13.3 to 48.9 for the 1987/88 season. Variation in diastatic activity was primarily due to non-additive gene action. The highest positive general combining ability effects were observed for the line 4HA85S, and tester 120A. Significant positive specific combining ability effects were observed for hybrid 120A x D 38073-2. This was the only cross which had positive high parent heterosis in both seasons, but it was only significant in the 1987/88 season. Most of the crosses had negative high parent heterosis. To improve diastatic activity, recurrent selection procedures for specific combining ability should be used to develop elite parents for hybrids.

Keywords
Sorgum bicolor , diastatic unit, heterosis, non-additive gene action

 
© Copyright 1997 - African Crop Science Society

Home Faq Resources Email Bioline
© Bioline International, 1989 - 2018, Site last up-dated on 22-May-2018.
Site created and maintained by the Reference Center on Environmental Information, CRIA, Brazil
System hosted by the Internet Data Center of Rede Nacional de Ensino e Pesquisa, RNP, Brazil