Heritability of resistance to potato late blight in an F1 population of elite potato cultivars

Phytophthora infestans is the most important disease in potato crops. Its control is based on the use of chemical products that have developed pathogen resistance and high economic and environmental impacts. To reduce these effects, the use of plant varieties or cultivars resistant to this pathogen has been proposed. The aim of this study was to evaluate the heritability of resistance to this pathogen in a population of elite Solanum phureja genotypes. In this study, 1,355 clones with three replicates from 20 families were included in the evaluation. Heritability was assessed in the broad and narrow senses. Results of the relative area under the disease progress curve varied between 0.08 and 0.64, indicating that the population contains genes that code for resistance. Heritability in both directions (narrow 0.022 and broad 0.255) showed significant differences, indicating an influence of dominance genetic effects and environmental effects. Thus, to use these genotypes in potato breeding programs, hybridization methods should be used instead of selection methods.

Keywords:
severity; area under the disease progress curve; genetic progress; incidence

Authorship

Nancy Yohana Grisales Vásquez ^** Corresponding author: ngrisales@agrosavia.co

AGROSAVIA - Corporación Colombiana de Investigación Agropecuaria, Centro de Investigación La Selva, Rionegro, Antioquia, Colombia. ngrisales@agrosavia.coAGROSAVIA - Corporación Colombiana de Investigación AgropecuariaColombiaRionegro, Antioquia, Colombia AGROSAVIA - Corporación Colombiana de Investigación Agropecuaria, Centro de Investigación La Selva, Rionegro, Antioquia, Colombia. ngrisales@agrosavia.co

http://orcid.org/0000-0003-1367-9158

José Miguel Cotes Torres

Universidad Nacional de Colombia, Departamento de Ciencias Agronómicas, Medellín, Antioquia, Colombia. jmcotes@unal.edu.coUniversidad Nacional de ColombiaColombiaMedellín, Antioquia, Colombia Universidad Nacional de Colombia, Departamento de Ciencias Agronómicas, Medellín, Antioquia, Colombia. jmcotes@unal.edu.co

http://orcid.org/0000-0002-2211-846X

^* Corresponding author: ngrisales@agrosavia.co

This work is part of the first author´s Master Dissertation

SCIMAGO INSTITUTIONS RANKINGS

Figures | Tables | Formulas

Figures (1)
Tables (3)
Formulas (2)

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Figure 1: Expected
response for the area under the disease progress curve relative to the susceptible check cultivar under different selection methods for the study population. Results are presented as the relative area under the disease progress curve (AUDPCr). Solid lines show the Bayes estimate and dashed lines display the highest posterior density at 95%.

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Table 1:
Full-sib families established in the study. The first name used in the crosses corresponds to the female parent and the second to the male parent

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Table 2:
Mean values, standard deviation (SD), and coefficient of variation (CV) for late blight severity at the last evaluation, percentage of affected individuals for the disease according to the severity scale used, and relative area under the disease progress curve (AUDPCr) in relation to the susceptible check cultivar in the families evaluated

Thumbnail

Table 3:
Narrow- and broad-sense heritability, estimated variance components, and 95% highest posterior density (HPD) intervals for the AUDPCr variable in the study population

Thumbnail

Figure 1: Expected response for the area under the disease progress curve relative to the susceptible check cultivar under different selection methods for the study population. Results are presented as the relative area under the disease progress curve (AUDPCr). Solid lines show the Bayes estimate and dashed lines display the highest posterior density at 95%.

Table 1: Full-sib families established in the study. The first name used in the crosses corresponds to the female parent and the second to the male parent

ID	Families	Ind	ID	Families	Ind
1	Galeras × Paola	82	11	Paysandú × Violeta	44
2	Ocarina × Paola	76	12	10-126-8 × Primavera	60
3	Violeta × Paola (*)	150	13	Paola × Primavera (*)	72
4	Paola × Violeta (*)	51	14	Ocarina × Violeta (*)	62
5	Primavera × Ocarina (*)	128	15	Paysandú × Paola	95
6	10-126-8 × Violeta	69	16	10-126-8 × Paola	66
7	Primavera × Violeta	60	17	Galeras × Primavera	97
8	Violeta × Ocarina (*)	63	18	B09-3-8 × Paola	28
9	Galeras × Violeta	55	19	Ocarina × Primavera (*)	19
10	Primavera × Paola (*)	74	20	Galeras × Ocarina	4

(*) Families with direct and reciprocal crossing
Ind: Number of individuals

Table 2: Mean values, standard deviation (SD), and coefficient of variation (CV) for late blight severity at the last evaluation, percentage of affected individuals for the disease according to the severity scale used, and relative area under the disease progress curve (AUDPCr) in relation to the susceptible check cultivar in the families evaluated

ID	Families		Severity			Percentage of progeny				AUDPCr
ID	Families		Mean	SD	CV	0	> 0 - 5	> 5 - 30	> 30 - 100	Mean	SD	CV
1	Galeras	Paola	17.24	13.85	80.33	1.23	45.87	51.97	0.93	0.20	0.19	92.85
2	Ocarina	Paola	18.88	14.98	79.35	3.03	49.66	44.28	3.03	0.31	0.41	131.76
3	Violeta	Paola	12.31	11.99	97.44	2.76	65.83	30.84	0.56	0.13	0.19	148.54
4	Paola	Violeta	13.96	12.20	87.38	0.00	68.43	31.57	0.00	0.10	0.08	78.29
5	Primavera	Ocarina	20.33	16.52	81.28	1.48	38.05	55.76	4.71	0.33	0.37	110.89
6	10-126-8	Violeta	16.26	13.77	84.71	3.50	57.93	37.34	1.22	0.18	0.25	142.02
7	Primavera	Violeta	17.65	16.11	91.28	0.00	61.49	37.92	0.60	0.18	0.17	98.58
8	Violeta	Ocarina	17.89	10.76	60.16	0.00	50.80	48.19	1.01	0.19	0.20	100.41
9	Galeras	Violeta	22.40	14.82	66.18	0.00	27.10	69.87	3.03	0.28	0.26	91.98
10	Primavera	Paola	7.56	7.40	97.95	2.96	79.04	18.01	0.00	0.10	0.13	133.31
11	Paysandú	Violeta	12.14	13.03	107.34	3.70	65.94	29.48	0.88	0.10	0.20	186.15
12	10-126-8	Primavera	8.17	5.60	68.64	0.63	82.73	16.64	0.00	0.09	0.07	81.01
13	Paola	Primavera	7.76	6.80	87.65	3.06	84.56	12.38	0.00	0.08	0.09	102.27
14	Ocarina	Violeta	16.01	9.13	57.06	2.94	52.28	44.78	0.00	0.15	0.12	78.21
15	Paysandú	Paola	12.53	13.06	104.23	1.35	67.93	30.36	0.36	0.14	0.18	131.06
16	10-126-8	Paola	12.80	14.50	113.24	6.75	61.94	28.19	3.12	0.19	0.29	151.73
17	Galeras	Primavera	14.21	10.90	76.73	3.41	46.64	49.52	0.42	0.14	0.16	120.92
18	B09-3-8	Paola	16.58	18.40	111.00	3.70	48.91	44.71	2.67	0.15	0.20	134.69
19	Ocarina	Primavera	12.17	6.74	55.40	0.00	50.00	50.00	0.00	0.14	0.12	85.67
20	Galeras	Ocarina	37.50	23.63	63.01	0.00	0.00	75.00	25.00	0.64	0.52	80.31
Overall population			14.56	13.30	91.37	-	-	-	-	0.17	0.23	136.00
Check susceptible variety			71.00	17.49	24.63	0.00	5.88	70.59	23.53	-	-	-

Table 3: Narrow- and broad-sense heritability, estimated variance components, and 95% highest posterior density (HPD) intervals for the AUDPCr variable in the study population

Estimated parameters	Bayes estimates		HPD 95%
Estimated parameters	Mean	Median	Lower	Upper
Additive variance (σ² _a)	0.00587	0.0014	< 0.0001	0.09145
Genetic variance (σ² _a + σ² _d)	0.05911	0.05933	0.03974	0.07713
Variance of the error (σ² _e)	0.18928	0.18917	0.17636	0.20222
Additive heritability (h² _a)	0.02274	0.00553	< 0.0001	0.09145
Genetic heritability (H²)	0.25511	0.25465	0.20144	0.30915
Additive/Dominant relation	0.11811	0.02259	< 0.0001	0.51336

\log_{e} (Y + 0.01) = 1 μ + X β + Z_{1} α + Z_{2} δ + e

R = i h^{2} σ_{p}^{2} \frac{1 + (n - 1) r}{\sqrt{n [1 + (n - 1) t}}

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