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为了鉴定东乡野生稻及其后代群体的耐低氮性,研究低氮和正常氮2种处理下“协青早B//东乡野生稻/协青早B”BC1F12回交重组自交系株高、抽穗期、穗长、有效穗数、穗实粒数、穗总粒数、着粒密度、结实率、千粒重和单株产量等10个表型性状,利用主成分分析和模糊隶属函数对BILs群体的耐低氮性进行综合评价.结果表明:株系116、143和157的耐低氮性强,可作为东乡野生稻耐低氮性遗传研究和水稻耐低氮性育种的中间材料.采用逐步回归分析法建立了耐低氮性最优回归方程,筛选到株高、穗总粒数、结实率、千粒重和单株产量等5个性状相对值可作为水稻全生育期耐低氮性的综合评价指标.因此,在水稻耐低氮性遗传改良中,应注重对这5个性状,尤其是穗总粒数和单株产量相对值的选择.
In order to identify the low nitrogen tolerance of Dongxiang wild rice and its progenies, the effects of low nitrogen and normal nitrogen treatments on the inbred lines “BCLFB // Dongxiang Wild Rice / Xieqingzao B ” BC1F12 backcross recombination 10 phenotypic traits such as plant height, heading date, panicle length, panicle number, panicles per panicle, panicles per panicle, grain density, seed setting rate, 1000-grain weight per plant and yield per plant were calculated by principal component analysis and fuzzy membership function The results showed that the lines 116, 143 and 157 were highly resistant to low nitrogen and could be used as intermediate materials for genetic research on low nitrogen tolerance and resistance to low nitrogen of rice in Dongxiang The optimal regression equation of low nitrogen tolerance was established by stepwise regression analysis, and the relative values of five traits such as plant height, total grains per spike, seed setting rate, 1000-grain weight per plant and so on were screened as low nitrogen tolerance Therefore, in the genetic improvement of low nitrogen tolerance in rice, attention should be paid to the selection of these five traits, especially the relative value of the total grain number per panicle and the yield per plant.