低磷胁迫下不同水稻基因型苗期根系性状的遗传研究  

Heredity Research on the Root Characters of Rice Genotype in Seedling Stage under Low Phosphorous Stress

作　　者：丁平[1] 贺立源[2] 李德华[3] 

机构地区：[1]江苏联合职业技术学院连云港中医药分院,江苏连云港222006 [2]华中农业大学资源环境学院,湖北武汉430070 [3]孝感学院生科院,湖北孝感432100

出　　处：《安徽农业科学》2008年第1期96-97,115,共3页Journal of Anhui Agricultural Sciences

基　　金：湖北省自然科学基金资助(2005ABA083)

摘　　要：[目的]为开展水稻耐低磷种质资源的遗传育种研究提供理论依据和遗传基础。[方法]对1个耐低磷水稻基因型和1个低磷敏感基因型,以及它们的正反交F1、RF1及F2后代的根系性状的遗传基础进行研究。[结果]结果表明:F1代的耐低磷性向高值亲本99112偏斜,表现出一定的杂种优势。正反交F1代的表型值几乎没有差异,可以推断为细胞核遗传。F2表现为连续变异性状,即数量性状。[结论]主根长符合E-1模型(2对加性-显性-上位性主基因+加性-显性多基因混合模型),主基因遗传力为62.47%,多基因的遗传力为20.49%;而根干重与根冠比这二个性状符合D-0(1对加性-显性主基因+加性-显性-上位性多基因遗传模型),其主基因遗传力分别为38.73%和59.80%,而多基因的遗传力分别为27.56%和35.60%。[Objective] The sindy aimed to provide theoretical basis and heredity base for developing heredity and breeding research of germplasm resources of rice with low phosporous （P） tolerance. [Method] Tne heredity base of root characters of a rice genotype with low P tolerance and a rice genotype sensitive to low P and their reciprocal crosses F1, RF1 and F2 was studied. [Result] Tne low P tolerance of F1 generation declined to the parent 99112 with high value, showing some heterosis. Tne phenotypic values of reciprocal crosses F1 nearly had no difference and could be concluded as nueleolus heredity. F2 showed to be continuously variant character, i.e. quantitative character. [Conclusion] Tne length of main root accorded with E-1 model （mixed heredity model of 2 pairs of additive-dominant-epistatic major genes ＋ additive-dominant multigene）, with the hereditary capacity of major gene being 62.47% and that of multigene being 20.49%. But the 2 characters of dry weight of root and ratio of root to coronal accorded with D-0 （heredity model of a pair of additive-dominant major genes ＋ additive-dominant-epistatic multigene）, with the hereditary capacity of major genes being 38.73% and 59.80% resp., and that of multigenes being 27.56% and 35.60% resp.

关 键 词：水稻 苗期 根系性状 遗传研究 

分 类 号：Q945.78[生物学—植物学]