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以33个不同玉米基因型为材料,在低磷和高磷两个供磷水平下,分析玉米基因型磷效率与多个相对根系性状的关系,建立最优回归方程。结果表明,相对总根重和相对须根数对磷效率的回归系数显著,建立磷效率与相对总根重和相对须根数二者的最优回归模型为Y=-0.224-0.576X2+1.780X3,R2=0.880(p<0.05);相对表层根重对磷效率的回归系数显著,建立磷效率与相对表层根重的最优回归模型为Y=-0.235+1.136X1,R2=0.653(p<0.05);相对须根数和相对表层根重可以作为培育高磷效率玉米基因型的改良目标性状。
Using 33 different maize genotypes as material, the relationship between phosphorus efficiency and relative root traits of maize genotypes was analyzed under two phosphorus supply levels, ie, low phosphorus and high phosphorus. The optimal regression equation was established. The results showed that the relative total root weight and relative number of fibrous roots had significant regression coefficients for phosphorus efficiency. The optimal regression model for establishing phosphorus efficiency and relative total root weight and relative fibrous root number was Y = -0.224-0.576X2 + 1.780X3, R2 = 0.880 (p <0.05). The regression coefficients of relative surface root weight to phosphorus efficiency were significant. The optimal regression model of phosphorus efficiency and relative surface root weight was Y = -0.235 + 1.136X1, R2 = 0.653 ). The relative number of fibrous roots and the relative surface root weight can be used as the improved target trait to cultivate high P efficiency corn genotypes.