Differentiation Of Indica And Japonica In Two Rice Genetic Population And The Relationship Between Parental Differentiation And Heterosis

Four aspects of works were studied in this thesis in order to clarify differentiation of indica and japonica in two rice genetic population and the relationship between parental differentiation and heterosis. 1. The relationship between morphological index and RFLP molecular markers that used for classification of indica and japonica; 2. The difference and similarity between DH and RIL population; 3. the relationship between the differentiation of indica and japonica in parental lines and heterosis of hybrids; 4. Special probe loci which contributes to yield and leaf related traits. The results were followed:1.The results of cononical analysis indicated that morphological index and molecular markers was of high correlation in classification of mdica and japonica. The first 5 pairs of cononical viable were significantly correlated. The correlation of the first pair of cononical viable (ul~. vi) came from the correlation of phenol reaction and length of the first and second panicle internode with RG214 and RG620. Correlation of u2 and v2 was from the correlation of hairiness of hull and length of the first and second panicle internode with RZ828 and73RG207. Correlation of u3 and v3 was from the correlation of hu1l colorwhen heading and length/width of grain with RG256 and RG482.Correlation of length of the first and second panicle internode andphenol reaction with RG752 resulted in the correlation of u4 and v4.Correlation of u5 and v5 was from correlahon betWeen color of hullwhen heading and RZ562. Consistency of morpho1ogical differentiationand genehc dmerentiation was indicated from consangUineous relationof taxonondc traitS and RFLP probes. The main reason for thesipecant correlation betWeen taxonondc traits and RFLP probes wassome genes about t8xonondc traits and probes lying in the same loci orlinking with each other Interachon betWeen tWo loci was anotherimport8nt reason.2. The integrated index (Pi) about differentiation of tridAs and1aPOnAs highly and positively correlated with the ratio of parentalgenome. Cheng's morphological index highiy and negatively correlatedwith the raho of parent8l genome. Both tWo methods can reflectvariation of the extent of indfor and jaPonjca in the whole genome. Theindex Pi significantly and negative1y correlat6d with Cheng's index.They were consistent when used in classifying typical jndAs and .-jaPtw, but had some difforence in classnying intermedthetypevariehes or lines. It was index Pi from speciaI differentiation probes inIndfor and 1isPch that can reflect the extent of dmerentiation ofindAs and tw in the whole genome more than morpho1ogicalindex.743. All the morphological traits of DH and RIL populations were incontinuous segregation and showed normal distribution. Thesegregation of traits in DH population was more drastical than that ofRIL population. It was indicated from this stUdy that the segregationand recombination of genes of 1ridAn and IaPQnAs in DH populationwere basical random and the overall frequency of a1leles did notdeviate from the ratio of 1:1. But RIL population was significantlytended to the 1hdAn parent. The genome ratio of 1hdAs parent wassignificantly higher than that of 1aPQnAn parent.4. Two sets of test-cross F, population from 064B/Dh andXieB/DH were used in this study, and the relationship betWeen theextent of genetic differentiation (Pi) of parental lines in hybrids andhet6rosis was stridied. The results indicated that there was a peak forthe distribution of panicle numbers and seed set at the interval of 14 to16 in Pi, so the grain yield was. It seems that the extent of geneticdifferentiahon of parental lines has no significant relation with weightof 1000 grains. As for traits about leaf, there was little difference in064B/DH populahon with variation of parental Pi value. However,there was a peak for the distribution of angle of sword leaf and widthand area of the three leafs on top in XieB/DH...