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作 者 ：陈俊意;蔡一林;徐德林;吕学高;陈天青

期 刊 ：植物营养与肥料学报 2007年 13卷 6期 页码：1068-1073

关键词：玉米基因型；生物学性状；磷效率；最优回归模型；

Keywords:maize genotypes, biological characteristics, phosphorus efficiency, optimum regression model,

摘 要 ：以32个不同玉米基因型为材料,在低磷和高磷两个供磷水平下,分析不同玉米基因型生物学性状和磷效率的基因型差异,根据相对生物学性状与磷效率,磷吸收效率和磷利用效率与磷效率进行多元线性回归分析,分别建立它们的最优回归方程,同时进行耐低磷基因型的筛选。结果表明,相对株高、相对地上部干重、相对地下部干重和相对叶龄基因型间变异范围分别为0.3090～0.9780、0.3140～0.947、0.3671～1.400和0.4550～0.790;磷效率、磷吸收效率和磷利用效率基因型间变异范围分别为0.1960～0.935、0.8794～4.235和0.6211～1.764。相对地下部干重对磷效率的回归系数显著,建立磷效率与相对地下部干重的最优回归模型为:Y=-0.087+0.702X₃,(P<0.05;R²=0.6549);磷吸收效率和磷利用效率对磷效率的偏回归系数均显著,建立磷效率与磷吸收效率和磷利用效率二者的最优回归模型为:Y=-0.379+0.274.X₁+0.301.X₂,(P<0.05;R²=0.7390)。耐低磷基因型的筛选结果表明,待选材料中,磷效率和相对生物性状都优良的只有178和082两个基因型,其他大部分基因型的磷效率和相对生物性状都是中低类型。

Abstract:Under low and high P application,32 Maize genotypes were selected to study the genotypic differences in biological characteristics and P efficiency.Multiple linear regression analyses and clustering of maize genotypes for P efficiency and relative biological characteristics were conducted,and seedling for tolerance to low phosphate stress was screened.The main results were summarized as follows: 1) The variation of relative plant height(RPH),relative plant dry weight(RPW),relative root dry weight(RRW) and relative leaf age(RLA) among genotypes were 0.309-0.978,0.314-0.947,0.367-1.400 and 0.455-0.790,respectively,the variation of P efficiency,absorption efficiency and utilization efficiency among genotypes were 0.196-0.935,0.879-4.235 and 0.621-1.764,respectively.2) Partial regression coefficient of relative root dry weight(RRW) to P efficiency was significant and the optimum regression equation was Y=-0.087+0.702X₃ (P<0.05,R²=0.6549).Partial regression coefficients of absorption efficiency and utilization efficiency to P efficiency were also significant and the optimum regression equation was Y=-0.379+0.2749 X₁+0.301 X₂(P<0.05,R²=0.7390).3) Only inbred lines 178 and 082 had the characteristics of high P efficiency and high relative biological characteristics,while most of studied inbred lines belonged to moderate and low ones.

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