Genetic Analyses On Nitrogen-Absobing And Nitrogen-Utilizing Efficiency Of Rice

A recombinant inbred lines population(RILs)of 163 lines derived form a cross of Dasanbyeo(indiaca)/TR22183(japonica)was evaluated for analyzing inheritance of traits: nitrogen-absorbing ability and nitrogen-utilizing efficiency of rice at the maturity stage by the major genes plus polygenes mixed inheritance model of quantitative traits in plant.The results are showed below.The analysis on the major genes plus polygenes mixed inheritance model indicated that Nitrogen dry matter production efficiency(NDMPE)was controlled by three major genes at N-fertilized and N-unfertilized.The heritability of the major genes controlled NDMPE were 74.58%and 32.98%.The additive effect value of three major genes showed difference at the difference nitrogen treatment level.The two major genes additive effect values were Equality at N-fertilized.They showed positively effect.Another major gene showed negative effect.The additive effect value of three major genes showed Equality and positively effect at N-unfertilized.Nitrogen grain production efficiency(NGPE)was controlled by two major genes and polygenes.The major genes effect showed difference at the difference nitrogen treatment level.The two major genes effect showed dominant epistatic and the major genes additive effect showed difference at N-fertilized.The two major genes effect showed inhibitory effects and included additive and additive epistatic interaction effect at N-unfertilized.Nitrogen transfer efficiency(NTE)was controlled by three major genes.Three major genes showed additive and additive epistatic interaction effect at N-fertilized and showed additive effect at N-unfertilized.The heritability of the major genes controlled NTE were 93.2%and 62.6%at N-fertilized and N-unfertilized.Total nitrogen accumulation(TNA)was controlled by three major genes.The three major showed geometric proportion Additivity.The heritability of the major genes controlled TNA were 59.04%and 33.7%at N-fertilized and N-unfertilized.Nitrogen content in Leaf(LN)was controlled by two major genes and polygenes.The heritability of the major genes controlled LN were 23.94%and 26.2%and the polygene heritability of were 61.85%and 55.84%at N-fertilized and N-unfertilized.The two major genes offered additive and additive epistatic interaction effect at N-unfertilized.At N-fertilized,they showed additive effect and the first major gene was approximately a half to the second and the first major gene was negative effect.Nitrogen content in Spike(SN)heritability control was greater,which were affected by environment easily.At N-fertilized,it showed three major genes and polygenes heritability.At N-unfertilized showed polygene heritability.Nitrogen content in balm(HN) was controlled by two major genes and polygenes.The additive effect value of major genes showed Equality and negative effect and the effects from the first major genes was low than the second at two nitrogen treatment level.The heritability of the major genes controlled HN were 60.83%and 36.73%at N-fertilized and N-unfertilized.The polygene heritability of were 22.14%and 57.95%.Nitrogen-utilizing efficiency(NDMPE,NGPE,and NTE)was negative correlation or significantly negative correlation to nitrogen-absorbing ability(LN,HN,and SN)at N-fertilized and N-unfertilized.NDMPE was significantly positively correlation to the dry matter weigh(DMW),but no significant correlation to TNA.NGPE was significantly positively correlation to NDMPE and NTE.Nitrogen-absorbing ability(LN,HN,and SN)was significantly negative correlation to rice important agronomic characters,the only outfit exception:HN was negative correlation or significantly negative correlation to harvest index(HI)and efficient panicle(EP).DMW and TNA were significantly positively correlation to rice important agronomic characters at N-fertilized and N-unfertilized,not including HI and EP.NDMPE was positively correlation or significantly positively correlation to rice important agronomic characters,except that it was negative correlation or significantly negative correlation to HI and EP and uncorrelation to Seed Setting(SS)at N-fertilized and N-unfertilized.NGPE and NTE was positively correlation or significantly positively correlation to HI,filled grain number per panicle (FGN)and seed weight per plant.Analysis of Canonical Correlation Between Nitrogen-absorbing ability and nitrogen-utilizing efficiency of rice and important agronomic characters at N-fertilized and N-unfertilized showed:NDMPE,NGPE,and NTE were closely related to HI and they were closely related to plant height,kernelnumbers per ear and SS at N-fertilized.