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Study of general combining ability in bread wheat based on grain yield in Uzbekistan

By: Contributor(s): Material type: TextTextPublication details: Tbilisi (Georgia) CIMMYT : 2004Description: p. 289Subject(s): DDC classification:
  • 633.1147 BED
Summary: Since recently general combining ability (GCA) is used in selecting parents for crosses in some research on heterosis in maize, sugar beat, sorghum, and some vegetable plants. When.Nurpeisov (2000) analyzed GCA of winter wheat varieties based on 11 traits, he discovered donors of the most valuable genes and suggested their involvement in further wheat breeding programs. This author pointed out the possibility to combine high-yield and frost-resistance in one genotype of winter wheat. Development of new variety Zhetysu and some breeding lines have proved the rightness of his conclusions. GCA of bread wheat has not been studied yet in Uzbekistan. Therefore, we set a task to study GCA of 15 released and promising lines under the conditions of Uzbekistan. Based on yield data, the selected bread wheat genotypes were found to differ in GCA (see the table ). Prevalent in Uzbekistan winter wheat variety Enbosh was characterized by high GCA in the severely dry 200 1 and moderately dry 2002 years. In contrast, Enbosh's GCA was low in the favorable 2003 year. Very similar variability in CGA was observed for variety Sanzar-8. High-yielding and promising bread wheat variety Turon showed high GCA only in the years with the favorable weather conditions for grain filling, while it was characterized by low GCA in the dry seasons. To study GCA, the most labor-intensive method of incomplete diallele crosses for 15 vari- eties required 45 hybrid combinations. 45 hybrid combinations are also required when we use top- crosses with three testers. High accuracy of the method suggests that study of CGA of bread wheat genotypes carry out at the beginning of the breeding process. The method of diallele crosses should be applied for the further study of the lines with high GCA and SCA. It will allow for conducting research of GCA and SCA of the released and promising wheat varieties with high precision and minimum labor input and select the best of them for using in crossing programs.
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library CIMMYT Publications Collection 633.1147 BED (Browse shelf(Opens below)) 1 Available 1Z630072
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Abstract only

Since recently general combining ability (GCA) is used in selecting parents for crosses in some research on heterosis in maize, sugar beat, sorghum, and some vegetable plants. When.Nurpeisov (2000) analyzed GCA of winter wheat varieties based on 11 traits, he discovered donors of the most valuable genes and suggested their involvement in further wheat breeding programs. This author pointed out the possibility to combine high-yield and frost-resistance in one genotype of winter wheat. Development of new variety Zhetysu and some breeding lines have proved the rightness of his conclusions. GCA of bread wheat has not been studied yet in Uzbekistan. Therefore, we set a task to study GCA of 15 released and promising lines under the conditions of Uzbekistan. Based on yield data, the selected bread wheat genotypes were found to differ in GCA (see the table ). Prevalent in Uzbekistan winter wheat variety Enbosh was characterized by high GCA in the severely dry 200 1 and moderately dry 2002 years. In contrast, Enbosh's GCA was low in the favorable 2003 year. Very similar variability in CGA was observed for variety Sanzar-8. High-yielding and promising bread wheat variety Turon showed high GCA only in the years with the favorable weather conditions for grain filling, while it was characterized by low GCA in the dry seasons. To study GCA, the most labor-intensive method of incomplete diallele crosses for 15 vari- eties required 45 hybrid combinations. 45 hybrid combinations are also required when we use top- crosses with three testers. High accuracy of the method suggests that study of CGA of bread wheat genotypes carry out at the beginning of the breeding process. The method of diallele crosses should be applied for the further study of the lines with high GCA and SCA. It will allow for conducting research of GCA and SCA of the released and promising wheat varieties with high precision and minimum labor input and select the best of them for using in crossing programs.

English

0409|AGRIS 0401|AL-Wheat Program

Juan Carlos Mendieta

CIMMYT Publications Collection


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