Crops ›› 2021, Vol. 37 ›› Issue (5): 14-19.doi: 10.16035/j.issn.1001-7283.2021.05.003

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Evaluation of the Adaptability of Tropical Maize Germplasm Population to Control Parental Mixed Selections

Zhang Yanru1(), Yang Zihe1, Yang Rong2, Han Jian3, Jiao Jinlong1, Zhao Li1, Wu Yuanqi1()   

  1. 1Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
    2Ya'an Agricultural Science Research Institute, Ya'an 625000, Sichuan, China
    3Agriculture and Rural Bureau of Peng'an County, Nanchong 637800, Sichuan, China
  • Received:2020-12-23 Revised:2021-07-07 Online:2021-10-15 Published:2021-10-14
  • Contact: Wu Yuanqi E-mail:1614245786@qq.com;wuyuanqi@hotmail.com

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Abstract:

In order to evaluate the effect of controlled parental mixed selection on the adaptive improvement of main characters of AC0, an African maize germplasm synthesis base population. The combined analysis of variance and coefficient of variation were used to analyze the variation of characters among populations. The results showed that compared with the basic population AC0, the plant height of the improved populations AC1 and AC2 increased by 8.60% and 11.60%, respectively, reaching a extremely significant level. The ear height increased by 11.34% and 16.18% respectively, reaching a extremely significant level. Compared to AC0, the ear length of improved populations AC1 and AC2 decreased by 2.60% and increased by 1.57%, and there was extremely significant difference between AC1 and AC2; the number of rows per ear increased by 2.44% and 1.12%, respectively, which did not reach significant level. The barren tip length of AC1 and AC2 increased by 0.75% and 13.12%, respectively, which did not reach significant level. In condusion, the early improvement of tropical germplasm yield traits by controlling parental mixed selection was less advanced. With the progress of improvement, the phenotypic variation coefficients of most traits in the populations decreased, but the variation coefficients of some traits were smaller or increased. However, controlled parental mixed selection could maintain the genetic diversity of the population better.

Key words: Maize, Tropical germplasm, Controlled parental mixed selection, Adaptive improvement, Traits

Table 1

The results of the analysis of variance of the various symptoms of the groups"

变异来源
Variation
source		 自由度
Freedom
degree		 株高
Plant
height		 穗位
Ear
height		 穗长
Ear length		 秃尖长
Barren tip
length		 穗行数
Rows
per ear		 行粒数
Kernels
per row		 穗粗
Ear
diameter		 轴粗
Axis
diameter		 粒深
Grain
depth		 穗重
Ear
weight		 轴重
Axis
weight		 单株产量
Yield per
plant
区组间Between zones 2 49.38 44.10 0.12 0.02 0.11 0.30 0.04 0.03 0.00 128.82 6.62 106.37
群体间Between groups 2 1091.63** 513.14** 0.43 0.05 0.09 2.77 0.21 0.16 0.00 64.85 4.24 47.96
误差Deviation 4 48.03 9.23 0.34 0.01 0.04 1.50 0.04 0.04 0.00 174.12 5.39 162.32

Table 2

Comparison of the averages the main agronomic traits among of groups"

变异来源
Variation source		 株高
Plant height (cm)		 穗位
Ear height (cm)		 穗长
Ear length (cm)		 秃尖长
Barren tip length (cm)		 穗行数
Rows per ear		 行粒数
Kernels per row
AC0 316.77 157.52 17.89 1.78 14.55 37.93
AC1 344.01 175.38 17.42 1.79 14.90 36.19
AC2 353.52 183.00 18.17 2.01 14.71 37.76
LSD0.05 6.39 5.07 0.56 0.27 0.46 1.41
LSD0.01 8.44 6.69 0.74 0.36 0.61 1.86
∆G (%) 11.60 16.18 1.57 12.90 1.12 -0.47
变异来源
Variation source		 穗粗
Ear diameter (cm)		 轴粗
Axis diameter (cm)		 粒深
Grain depth (cm)		 穗重
Ear weight (g)		 轴重
Axis weight (g)		 单株产量
Yield per plant (g)
AC0 4.02 2.08 0.97 207.78 35.03 200.45
AC1 4.44 2.46 0.99 198.72 32.66 192.76
AC2 3.94 2.04 0.95 201.45 33.76 194.69
LSD0.05 0.88 0.76 0.34 9.25 2.18 9.01
LSD0.01 1.17 1.00 0.45 12.20 2.88 11.89
∆G (%) -1.27 -1.57 -2.42 -3.05 -3.64 -2.87

Fig.1

Coefficients of variation of the main agronomic traits"

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