山桃杂交群体抗蚜优系的背景选择与标记优劣比较

doi:10.3864/j.issn.0578-1752.2023.15.013

Abstract

Abstract:

【Objective】 To establish a background selection system in peach, the seedlings contained aphid-resistance locus and high female parent recovery rate were screened from an F₂ population crossed by Xiang Pi You Tao peach (big fruit and susceptible to aphid) and Zhou Xing Shan Tao peach (small fruit and resistant to aphid). 【Method】 Firstly, three methods were used to select background markers, including the high polymorphic single nucleotide polymorphism (SNP) obtained from the previous study (Pre-work SNP), SNP randomly selected in the whole genome (Random SNP), and functional SNP affecting the start and stop codon (Functional SNP). The number of final SNP selected by the above methods were 775. Then, using these SNPs, the parents recovery rate for all 121 individuals of the F₂ population were calculated, respectively. The repeatability of the selection methods was evaluated by comparing whether the top 10 seedlings with different selection markers were coincident or not. After completing the evaluation of aphid resistance, single fruit weight, and soluble solids content of F₂ population, 10 seedlings with extreme phenotypes for the single fruit weight and soluble solids content were selected, respectively. And the superiority and inferiority of different selection methods were estimated by comparing the significance of the differences in Xiang Pi You Tao recovery rates between the two types of phenotypes. Finally, the SNPs in the aphid-resistant location area were used as the foreground markers to screen the elite seedlings with high maternal genetic background and aphid resistance. 【Result】 The background recovery rates of the F₂ seedlings which calculated by the three methods were 36.34%-71.99%, 31.75%-74.92%, and 4.51%-66.53%, respectively. Among the top 10 seedlings with high Xiang Pi You Tao recovery rates screened by the three background markers, Pre-work SNP and Random SNP had two duplicate single plants, and so do Pre-work SNP and Functional SNP, and there were 6 repetitive single plants in Random SNP and Functional SNP. This result indicated that the repeatability between the Random SNP and Functional SNP was the highest among all comparisons. When single fruit weight was selected as the breeding target, among the extreme phenotypic monocots, the three background markers, such as Pre-work SNP, Random SNP, and Functional SNP, had a significant Xiang Pi You Tao background recovery rate of 0.069, 0.26, and 0.092, respectively, which meant high relativity was found between the background recovery rate calculated by Pre-work SNP and their fruit weight, followed by Functional SNP, and Random SNP difference was not significant. When soluble solids content was selected as the target, the Xiang Pi You Tao background recovery rates among extreme phenotypic monocots were significant at 0.77, 0.65 and 0.31, respectively, and the differences among the three background markers were not significant. Finally, two individuals with high recovery rate of Xiang Pi You Tao peach were screened, including N20 and N36. Among them, N20 comprised the aphid-resistant markers, and this individual showed aphid resistance with an average fruit weight of 34.42 g and soluble solids content of 16.1%, which was considered to be the superior single strain of this population. 【Conclusion】 In this study population, Pre-work SNP showed a stronger correlation between single fruit weight and Xiang Pi You Tao background recovery rates than Functional SNP and Random SNP, confirming the superiority of this background marker selection method, and the superior performance of N20 plants, which selected with this background marker in the target traits also supported this result. This study provided an idea of background selection and a method to judge the superiority and inferiority of different background markers in the study population, which could effectively improve the efficiency of resistance breeding in fruit crops.

Key words: peach, aphid-resistant, SNP, foreground selection, background selection

LIU SuNing, BIE HangLing, WANG JunXiu, CHEN XueJia, WANG XinWei, WANG LiRong, CAO Ke. Background Selection and Comparison of Marker Superiority and Inferiority of Aphid-Resistant Seedlings in an Interspecific Cross Peach Population[J].Scientia Agricultura Sinica, 2023, 56(15): 2995-3005.

Figures/Tables 6

Fig. 1

Table 1

Proportion of F2 plants on eight chromosomes to the bi-parents"

背景标记类型 Background marker type	染色体 Chr	橡皮油桃 Xiang Pi You Tao				帚形山桃 Zhou Xing Shan Tao
背景标记类型 Background marker type	染色体 Chr	平均回复率 Average response rate (%)	变异系数 CV (%)	变异幅度 Variation amplitude (%)	超中亲率 HM (%)	平均回复率 Average response rate (%)	变异系数 CV (%)	变异幅度 Variation amplitude (%)	超中亲率 HM (%)
多态性SNP Pre-work SNP	1	57.19	24.84	15.49-78.87	81.82	34.34	36.40	14.08-71.83	14.88
	2	63.66	27.50	3.39-83.05	79.34	28.79	60.34	10.17-86.44	15.70
	3	50.41	42.20	3.45-79.31	71.90	39.18	53.71	15.52-91.38	34.71
	4	55.15	45.24	2.08-81.25	67.77	38.41	70.36	14.58-97.92	29.75
	5	62.24	33.83	2.63-89.47	78.51	26.56	86.93	0.00-84.21	22.31
	6	72.41	13.46	36.99-87.67	94.21	21.69	47.83	6.85-61.64	4.96
	7	38.87	40.02	2.94-67.65	38.84	53.72	34.37	20.59-94.12	59.50
	8	45.05	34.07	3.03-63.64	66.12	45.60	35.94	27.27-87.88	37.19
随机SNP Random SNP	1	49.50	34.93	17.01-87.76	70.25	21.11	47.53	7.48-60.54	9.92
	2	52.12	34.71	21.18-88.24	81.82	19.42	61.99	3.53-62.35	12.40
	3	41.69	47.67	12.50-82.95	55.37	27.17	69.89	5.68-71.59	28.10
	4	38.66	50.94	6.85-80.82	47.93	31.50	58.93	4.11-76.71	31.40
	5	40.93	63.28	7.27-98.18	56.20	23.73	93.49	0.00-78.18	25.62
	6	60.06	41.10	17.89-95.79	78.51	13.47	78.92	1.05-52.6	4.96
	7	27.63	46.68	8.70-92.75	60.33	40.03	62.40	2.90-71.01	28.93
	8	32.21	43.62	19.18-89.04	58.68	29.91	63.16	2.74-63.01	23.97
功能SNP Functional SNP	1	44.63	52.50	2.61-96.08	67.77	21.95	57.48	1.96-54.90	21.49
	2	38.20	58.04	3.57-85.71	52.07	29.47	53.94	1.79-77.68	35.54
	3	37.26	72.27	0.00-96.00	46.28	32.01	63.16	1.11-77.00	38.02
	4	35.26	76.38	1.04-93.75	42.98	35.12	56.58	2.08-75.00	46.28
	5	31.51	92.74	0.00-97.44	39.67	29.40	71.29	0.00-76.92	36.36
	6	40.31	37.85	0.00-77.78	58.68	28.37	47.14	11.11-77.78	16.53
	7	34.14	72.87	2.30-89.66	44.63	31.45	62.23	2.30-79.31	38.84
	8	39.58	62.46	3.41-90.91	57.85	29.09	67.21	2.27-79.55	39.67

Table 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

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Background Selection and Comparison of Marker Superiority and Inferiority of Aphid-Resistant Seedlings in an Interspecific Cross Peach Population

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