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Genetic variation of characters associated with low nitrogen tolerance in tropical maize

CHEN Ze hui 1,A L Carpena 2 (1 Upland Crop Institute,Guizhou Academy of Agricultural Sciences,Guiyang 550006,China;2 University of Philippines)  
The study used six tropical maize inbred lines from CTMMYT as parents of a 6×6 half diallel cross and evaluated under low and high levels of N application to determine the types,relative magnitudes of gene effects and heritability.Field experiments were conducted at University of Philippines during the 1997 wet and 1997-1998 dry seasons.Under low N condition,there were significant additive genetic differences in the base population for grain yield,number of rows per ear,100 kernel weight,ear length,number of ears per plant,number of green leaves below ear,anthesis silking interval,ear leaf area,and shoot dry weight,and highly significant additive differences for plant height.The characters which have higher narrow sense heritability are plant height,ear length,ear leaf area,100 kernel weight,number of rows per ear,and number of green leaves under ear.The results suggested the possibility of solving N deficiency problem by breeding technology.
【CateGory Index】: S513.01
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