Crops ›› 2023, Vol. 39 ›› Issue (2): 201-206.doi: 10.16035/j.issn.1001-7283.2023.02.029

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Correlation and Path Analysis of Three Ear Leaves on Yield in Maize

Cui Shuna(), Wang Ye, Lu Yuqing, Pan Jinbao, Zhang Qiuzhi()   

  1. Beijing University of Agriculture, Beijing 100096, China
  • Received:2022-01-27 Revised:2022-02-21 Online:2023-04-15 Published:2023-04-11

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Abstract:

Through the correlation analysis of leaf length, width, area of three ear leaves and yield of 168 maize hybrid combinations, the correlations between each characteristic and maize yield were explored, so as to provide a theoretical basis for the breeding of excellent maize varieties. The results showed that, the variation coefficient of plot yield was large, which was 19.27%, the coefficients of variation of three ear leaves characteristics ranged from 6.34% to 9.59%, and the degrees of variation of each characteristic were similar. Correlation analysis showed that, there was a very significant positive correlation between plot yield and three ear leaves characteristics. In path analysis, the positive direct path coefficient of each characteristic on maize yield was as follows: upper ear leaf width, upper ear leaf length, ear leaf area, ear leaf length, lower ear leaf area, lower ear leaf width, lower ear leaf length, ear leaf width and upper ear leaf area, and the negative direct path coefficient was as follows: lower ear leaf length, ear leaf width and upper ear leaf area. Therefore, expanding the ear three leaves area could effectively improve the maize yield, especially the maize hybrids that increased the leaf area by increasing the leaf width under the ear and the leaf length at the ear position are more conducive to the increase of maize yield.

Key words: Maize, Three ear leaves, Yield, Correlation

Table 1

Descriptive statistical results of three ear leaves characteristics and plot yield of maize"

指标
Index		 极小值
Minimum		 极大值
Maximum		 平均
Mean		 标准差
Standard deviation		 变异系数
Coefficient of variation (%)
小区产量Plot yield (kg) 1.61 5.35 3.71 0.71 19.27
穗上叶面积Upper ear leaf area (cm2) 435.0 750.3 583.2 0.01 9.59
穗位叶面积Ear leaf area (cm2) 493.4 789.8 639.5 0.01 8.76
穗下叶面积Lower ear leaf area (cm2) 483.0 826.7 660.3 0.01 9.20
穗上叶长Upper ear leaf length (cm) 69.0 94.0 82.4 0.06 6.86
穗位叶长Ear leaf length (cm) 75.5 99.5 88.5 0.06 6.34
穗下叶长Lower ear leaf length (cm) 75.0 104.0 91.0 0.06 6.37
穗上叶宽Upper ear leaf width (cm) 7.5 10.8 9.4 0.01 6.61
穗位叶宽Ear leaf width (cm) 7.7 11.2 9.6 0.01 6.46
穗下叶宽Lower ear leaf width (cm) 8.0 11.5 9.7 0.01 7.03

Table 2

Correlations between plot yield and three ear leaves characteristics"

指标Index y x1 x2 x3 x4 x5 x6 x7 x8 x9
y 1
x1 0.396** 1
x2 0.442** 0.936** 1
x3 0.452** 0.793** 0.858** 1
x4 0.260** 0.728** 0.653** 0.493** 1
x5 0.317** 0.654** 0.688** 0.526** 0.925** 1
x6 0.304** 0.562** 0.597** 0.663** 0.808** 0.876** 1
x7 0.299** 0.689** 0.672** 0.635** 0.009 -0.027 -0.038 1
x8 0.282** 0.619** 0.671** 0.643** -0.042 -0.075 -0.074 0.952** 1
x9 0.316** 0.521** 0.575** 0.708** -0.105 -0.127 -0.057 0.878** 0.924** 1

Table 3

Path analysis of plot yield and three ear leaves characteristics"

指标
Index		 简单相关系数
Simple correlation coefficient		 直接通径系数
Direct path coefficient		 间接通径系数Indirect path coefficient 合计
Total
x1 x2 x3 x4 x5 x6 x7 x8 x9
x1 0.40 -1.038 0.000 0.445 0.235 0.355 0.196 -0.141 0.617 -0.411 0.143 1.438
x2 0.44 0.473 -0.976 0.000 0.256 0.317 0.208 -0.151 0.599 -0.445 0.160 -0.033
x3 0.45 0.297 -0.820 0.407 0.000 0.239 0.159 -0.166 0.563 -0.425 0.196 0.153
x4 0.26 0.487 -0.758 0.308 0.146 0.000 0.277 -0.204 0.009 0.027 -0.030 -0.227
x5 0.32 0.301 -0.675 0.326 0.158 0.448 0.000 -0.222 -0.027 0.046 -0.036 0.019
x6 0.30 -0.252 -0.581 0.284 0.196 0.394 0.265 0.000 -0.036 0.046 -0.017 0.552
x7 0.30 0.894 -0.716 0.317 0.187 0.005 -0.009 0.010 0.000 -0.630 0.243 -0.594
x8 0.28 -0.664 -0.644 0.317 0.190 -0.019 -0.021 0.018 0.849 0.000 0.254 0.944
x9 0.32 0.276 -0.540 0.274 0.211 -0.054 -0.039 0.015 0.787 -0.610 0.000 0.044
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