Crops ›› 2020, Vol. 36 ›› Issue (3): 42-46.doi: 10.16035/j.issn.1001-7283.2020.03.007

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Genetic Analysis of Grain Shape Related Traits in Tartary Buckwheat

Li Chunhua1,2, Huang Jinliang3, Yin Guifang1, Wang Yanqing1, Lu Wenjie1, Sun Daowang1, Wang Chunlong2, Guo Laichun2, Hong Bo4, Ren Changzhong2(), Wang Lihua1()   

  1. 1Biotechnology and Germplasm Resources Institute, Yunnan Academy of Agricultural Sciences/Yunnan Provincial Key Laboratory of Agricultural Biotechnology/Key Laboratory of Southwestern Crop Gene Resources and Germplasm Innovation, Ministry of Agriculture and Rural Affairs, Kunming 650205, Yunnan, China
    2Baicheng Academy of Agricultural Sciences of Jilin Province, Baicheng 137000, Jilin, China
    3Jilin Dunhua Potato Development and Breeding Center, Dunhua 133700, Jilin, China
    4Baoyun Station for Popularizing Agricultural Technology, Huize 654200, Yunnan, China
  • Received:2019-11-06 Revised:2019-12-20 Online:2020-06-15 Published:2020-06-10
  • Contact: Changzhong Ren,Lihua Wang E-mail:renchangzhong@163.com;wanglihua70@hotmail.com

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Abstract:

In this study, we used the hybrid offspring of two tartary buckwheat varieties with large difference in grain size to carry out the genetic parameter of grain-related traits closely related to yield and the phenotypic and genetic correlation among grain-related traits. The results showed that grain length, grain width, length-width ratio and 1000-kernel weight of F2 and F3 populations were all higher than that of their parents, the coefficient of variation of grain length, grain width and length-width ratio was less than 10%, and the coefficient of variation of 1000-kernel weight was more than 10%. In addition, the additive variance of grain length, grain width, length-width ratio and 1000-kernel weight were higher than that of the dominant variance. The broad sense heritability was from 0.77 to 0.82 and from 0.82 to 0.85 in F2 and F3 generations, respectively, and the true sense heritability was over 0.80. The correlation analysis between grain shape traits showed that there were significant phenotypic positive correlations among grain length, grain width and 1000-kernel weight, and the genetic correlation coefficients of grain width and 1000-kernel weight, grain length and aspect ratio was large. The above results indicated that grain shape related traits with high heritability could be selected in early generations, but since these traits were quantitative traits and controlled by multiple genes, it was suggested that the offspring should continue to be propagated until the genotype was stable, it is most effective to select the characters with the correlation among them.

Key words: Tartary buckwheat, Grain shape, Genetic rule, Genetic correlation, Phenotypic correlation

Fig.1

Determination of hybrids"

Table 1

Isolation ratio of F2 and F3 population and phenotypic values of agronomic traits"

性状Trait 2014 2015
F2群体 F2 population 亲本Parent F3群体 F3 population 亲本Parent
变异范围
Range of
variation		 平均值Average
value		 变异系数
Coefficient of
variation (%)		 母本
Female
parent		 父本
Male
parent		 变异范围
Range of
variation		 平均值Average
value		 变异系数
Coefficient of
variation (%)		 母本
Female
parent		 父本
Male
parent
粒长Grain length (mm) 3.03~5.42 4.55 5.64 4.33 3.87 3.85~5.70 4.86 6.62 4.39 4.31
粒宽Grain width (mm) 2.13~3.35 3.02 5.03 3.22 2.40 2.50~3.75 3.16 8.19 3.33 2.89
长宽比Length-width ratio 1.32~1.96 1.64 7.01 1.36 1.60 1.12~1.77 1.44 7.33 1.33 1.54
千粒重1000-kernel weight (g) 7.50~18.08 14.70 10.25 17.62 10.49 11.13~23.19 17.91 14.26 19.61 12.70

Table 2

Genetic parameters of agronomic traits"

性状Trait 加性方差Additive variance (A) 显性方差Dominance variance (D) 平均显性度
Average degree of dominanace ($\sqrt{\text{D/A}}$)		 广义遗传率
Broad sense heritability		 狭义遗传率
Narrow sense heritability		 固定遗传率
True sense
heritability
F2 F3 F2 F3
粒长Grain length 11.12 6.07 0.74 0.81 0.85 0.71 0.75 0.87
粒宽Grain width 22.96 19.90 0.93 0.82 0.85 0.66 0.72 0.86
长宽比Length-width ratio 4.07 1.51 0.61 0.78 0.83 0.68 0.75 0.80
千粒重1000-kernel weight 24.95 11.79 0.69 0.77 0.82 0.73 0.77 0.84

Table 3

Phenotypic and genetic correlation between agronomic traits"

性状Trait 千粒重
1000-kernel
weight		 粒长
Grain
length		 粒宽
Grain
width		 长宽比
Length-width
ratio
千粒重1000-kernel weight 0.52 -0.88 -0.18
粒长Grain length -0.42** -0.46 0.71
粒宽Grain width -0.53** 0.55** -0.31
长宽比Length-width ratio -0.23* 0.25* -0.66**
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