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0．309～0．978、0．314～0．947、0．367～1．400和0．455～0．790；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0．196～0．935、0．879～4．235和0．621～1．764。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；R^2=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＋0．274X1＋0．301X2，（P〈0．05；R^2=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。
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, R^2 = 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, R^2 = 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.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2007年第6期1068-1073,共6页
Journal of Plant Nutrition and Fertilizers
基金
重庆市动植物良种创新工程项目(8317)资助
关键词
玉米基因型
生物学性状
磷效率
最优回归模型
maize genotypes
biological characteristics
phosphorus efficiency
optimum regression model
