Knowledge Center Catalog

Analyses of combining ability and heterotic groups of yellow grain quality protein maize inbreds

By: Contributor(s): Material type: TextTextPublication details: Nairobi (Kenya) KARI|CIMMYT : 2002Description: p. 143-147ISBN:
  • 970-648-120-6
Subject(s): DDC classification:
  • 338.16 FRI
Summary: Information on the combining ability and heterotic patterns of maize germplasm is of great value to maize breeders. The objective of this study is to determine the heterosis and combining ability of 10 yellow Quality Protein Maize (QPM) inbreds. Among these 10 QPM inbreds, 5 are tropical and subtropical QPM inbreds introduced from CIMMYT, another 5 are from the domestic provinces. These 10 QPM inbreds were used to make up a 10-parent diallel and these 45 crosses were tested in three different environments in Yunnan Province and Guangxi Autonomous region. Highly significant difference was observed among 45 entries and 3 environments for grain yield, while non-significant difference among 3 replications. General combining ability (GCA) was highly significantly different for grain yield, while specific combining ability (SCA) was not significantly different. The highest-yielding cross was CML166 x Qi205 (10,880 kg/ha) and the lowest-yielding cross was Chang631/02 x Zhongxi096/02 (5,496 kg/ha). The highest value of GCA for grain yield is CML161 (1,010.53) and CMLI66 (947.J J), while the lowest value is Zhong x i096/02 (-I,J 19.98). The highest value of SCA f()r grain yield is CML194 x Xin910J/O2 (1,8J3.50) and CMLJ66 x Qi205 (J,272.00), while the lowest value is Xin910J/O2 x Qi205 (-J,670.96). According to the performance of grain yield, these J 0 QPM inbreds could be divided into 4 heterotic groups.
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Information on the combining ability and heterotic patterns of maize germplasm is of great value to maize breeders. The objective of this study is to determine the heterosis and combining ability of 10 yellow Quality Protein Maize (QPM) inbreds. Among these 10 QPM inbreds, 5 are tropical and subtropical QPM inbreds introduced from CIMMYT, another 5 are from the domestic provinces. These 10 QPM inbreds were used to make up a 10-parent diallel and these 45 crosses were tested in three different environments in Yunnan Province and Guangxi Autonomous region. Highly significant difference was observed among 45 entries and 3 environments for grain yield, while non-significant difference among 3 replications. General combining ability (GCA) was highly significantly different for grain yield, while specific combining ability (SCA) was not significantly different. The highest-yielding cross was CML166 x Qi205 (10,880 kg/ha) and the lowest-yielding cross was Chang631/02 x Zhongxi096/02 (5,496 kg/ha). The highest value of GCA for grain yield is CML161 (1,010.53) and CMLI66 (947.J J), while the lowest value is Zhong x i096/02 (-I,J 19.98). The highest value of SCA f()r grain yield is CML194 x Xin910J/O2 (1,8J3.50) and CMLJ66 x Qi205 (J,272.00), while the lowest value is Xin910J/O2 x Qi205 (-J,670.96). According to the performance of grain yield, these J 0 QPM inbreds could be divided into 4 heterotic groups.

English

0410|AGRIS 0401|AL-Maize Program

Juan Carlos Mendieta

CIMMYT Publications Collection


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