首页|Analysis of Heterosis in Intercomposite Crosses of Maize in Rainfed Conditions
Analysis of Heterosis in Intercomposite Crosses of Maize in Rainfed Conditions
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Breeding of early composites is an attractive proposition for improving the maize productivity in North-Eastern India， since it is largely grown in rainfed conditions。 A half-diallel cross involving six early and high yielding composites was made during rabi 2002～2003。 The crosses and their parents were evaluated in an RCBD during kharif 2003 at Assam Agricultural University (AAU)， Jorhat， India。 The objective of the study was to analyze the heterosis for its components and evaluate the genetic potential of the composites。 Heterosis was analyzed following Analysis II of variety cross diallel。 The variations due to varieties (vi)， heterosis (hi) and its components were significant for ear length， ear diameter， kernels per row， 100 kernel weight and grain yield。 Good variety effect (vi) was observed in the composite Kiran for ear diameter， kernels per row， 100 kernel weight and grain yield， and in Megha for days to 50% pollen shed， ear diameter and grain yield。 Desirable gca (gi) effects were observed in Megha for days to 50% pollen shed， ear diameter， 100 kernel weight and grain yield， and in Mahi Kanchan for grain yield only。 The crosses Megha×Mahi Kanchan， Guj Makkai-2×Mahi Kanchan and Megha×Pusa Composite-1 had high mean and high specific heterosis (sij) for grain yield。 These involved at least one parent with good gca。 Megha×Mahi Kanchan was identified as the most promising variety cross for possible use as broad base population for development of composites。
Average heterosisVariety effectGCASpecific heterosisVariety diallelMaize
Li Jie、Ma Yue、Guo Ruifeng、Shao Zhixiang
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B. Devi@Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat 785013, Assam, India--N. Sarma Barua@Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat 785013, Assam, India--
Asian Regional Maize Workshop
Beijing(CN)
Proceedings of the Ninth Asian Regional Maize Workshop
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