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《Acta Agronomica Sinica》 1963-03
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A STUDY ON THE EFFECTIVENESS OF SELECTION OF QUANTITATIVE CHARACTERS IN RICE

Shen Ching-hwa (Institute of Crop Breeding and Cultivation,Chinese Academy of Agricultural Sciences)  
An analysis of the components of variations and the estimation of four genetic para-meters,namely heritability,genetic correlation,genetic advance and selection index,in F_2population and F_3 progenies of six crosses between varieties of different ecolog cal type ofkeng rice,were made at the Institute Farm,Peking in 1962-1963.1.The heritabilities of important economic characters of rice as estimated from 4 differentmethods (heritability in the broad sense,regression of offsprings on parents,correlation be-tween them and variance analysis) showed a uniform tendency with the exception of grainsper ear and 200-grain weight.The heritability of heading days was the highest,those ofplant height and ear length ranked next,while those of sterility,ears per plant and ear weightper plant were among the lowest.2.Phenotypic,genotypic and environmental correlations among characters were calculated.In all instances,genotypic correlations were higher than the corresponding phenotypic corréla-tions,and both were of the same direction.The degrees of correlation between charactersvaried with different crosses.Thus,in Kwang-Fu No.1 Foji-Saka No.5,correlations be-tween yield (ear weight per plant) and other characters were comparatively low;while with853 Norin No.20,there were high geotypic correlations between yield on the one hand andheading days,plant height,ear length on the other hand.3.By selecting the 5% top or bottom performing F_3 progenies,the expected genetic pro-gress and its relative efficiency for plant height were the heighest in the cross Bih-Chieh 800granis Norin No.20,being 17.88 cm.and -14.7% respectively;those of sterility were thehighest in Shui-Yuan 300 grain Ping-Shah native variety,being -6.81 and -33.82% respec-tively.In the cross of 853 Norin No.20,both genetic advance and its relative efficiencywere high for heading days,200-grain weight and yield (ear weight per plant).4.Selection of one character in hybrid population would simultaneously affect the geneticprogress of other characters.For example,through a 5% selection toward shortness for plantheight in Kwang-Fu No.1 Foji-Soka No.5,the selected progenies showed earlier in ma-turity,had less grains per ear.5.A number of selection indexes were formulated.Using data on yield components;i.e.grains per ear,200-grain weight and ears per plant,the reliability of the expected geneticprogress in yield was 42% higher than that from straight selection for ear weight per plant.If the index was worked out on the basis of grains per ear and 200-grain weight,the relativeefficiency was 14% higher than on yield alone.Selection scores calculated from the most effec-tive selection index was used to evaluate the relative performance of superior progenies insome crosses.6.Experimental results revealed that the four genetic parameters mentioned above,wereeffective means for increasing the effectiveness of selection in the breeding programme of rice.
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【Co-citations】
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【Co-references】
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