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PRINCIPLES AND EFFECTS OF CHOOSING PARENTS AND HANDLING SEGREGATING GENERATIONS IN HIGH PROTEIN BREEDING OF WHEAT

Jin Zhengxun,Zhao Xihua ,Tong Mingyao (Agricultural College,Northeast Agriculture University,Harbin China ,150030 PRC)  
The principle and effect of choosing parents and handling segregating generations in high protein breeding of wheat were studied using Griffing′s method 2 design. The results were:1.The grain. protein content of individual plant in F 2showed transgressive segregation.2. There were significant genetic correlation in the population mean of protein content between different generations of a combination.3.The heritability of the grain protein content varied with changes of estimating methods,the population size and the material characteristics ,i.e,population plant ,late generationearly generation,and combinations of high protein content combinations of low protein content .4.The effect of selection was closely related with parent characteristics.The effect of different selection methods to select protein content varied with cross types.
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