REACTION OF POTATO CULTIVARS AND CLONES TO <i>Phytophthora infestans</i>

CASA-COILA, VICTOR HUGO; GOMES, CESAR BAUER; LIMA-MEDINA, ISRAEL; ROCHA, DEDIEL JUNIOR AMARAL; PEREIRA, ARIONE DA SILVA; REIS, AILTON

doi:10.1590/1983-21252019v32n212rc

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Agronomia • Rev. Caatinga 32 (2) • Apr-Jun 2019 • https://doi.org/10.1590/1983-21252019v32n212rc copy

REACTION OF POTATO CULTIVARS AND CLONES TO Phytophthora infestans¹ 1 Paper extracted from the doctoral thesis of the first author.

REAÇÃO DE CULTIVARES E CLONES DE BATATA A Phytophthora infestans

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The in vitro and field reactions of 23 potato cultivars and clones to two isolates of Phytophthora infestans were tested. The in vitro test used the detached potato leaflets method, and disease severity was evaluated 6 days after inoculation. Field experiments were conducted in autumn of 2013, in two locations in Pelotas City, Rio Grande do Sul State, Brazil. Seven evaluations of the disease severity were performed. From the severity values, the area under the disease progress curve (AUDPC) was calculated. Tubers were harvested to determine the yield (g plot^-1). The A2 mating type isolate was the most aggressive for the majority of the potato genotypes. It was possible to group the different reactions of the potato genotypes based on the AUDPC values. Clones C2553-1-06, C2573-4-06, C2550-4-06, C2551-2-06, and CIP392,617.54 showed moderate-to-high resistance to the two isolates of P. infestans. The values of severity and AUDPC obtained in vitro and field tests were positively correlated for both P. infestans isolates, but in some interactions, inconsistencies were observed. Tuber yield was negatively correlated with AUDPC.

Keywords:
Solanum tuberosum; Late blight; Pathotypes; Disease resistance

	Isolate
Genotype	A2 Mating type	A1 Mating type
Bintje¹	99.00 Aa³	29.50 Ba
Macaca	98.50 Aa	17.50 Ba
F63-01-06	98.00 Aa	18.00 Ba
C2557-2-06	97.75 Aa	9.75 Bb
CL02-05	96.50 Aa	24.25 Ba
F189-09-06	93.25 Aa	39.00 Ba
RM98-23-05	92.00 Aa	29.00 Ba
Bel	90.75 Aa	22.00 Ba
Clara	90.25 Aa	19.50 Ba
Ana	87.75 Aa	25.25 Ba
Asterix	81.25 Ab	33.75 Ba
Eliza	76.25 Ab	0.10 Bb
F23-24-06	74.00 Ab	39.50 Ba
CL20-01-06	75.00 Ab	22.00 Ba
Ágata¹	64.25 Ab	25.75 Ba
C2550-4-06	48.50 Ac	3.75 Bb
C2545-1-06	30.00 Ac	12.00 Ab
C2553-1-06	41.25 Ac	4.52 Bb
C2551-2-06	39.25 Ac	0.55 Bb
C2569-1-06	35.50 Ac	21.50 Aa
C2573-4-06	27.02 Ac	0.00 Bb
C2572-3-06	15.00 Ad	6.27 Ab
CIP392.617-54²	1.75 Ad	0.00 Ab
CV (%)	22.75	42.76

		A2 Mating type			A1 Mating type
Genotype	AUDPC	Severity (%)	Reaction¹	AUDPC	Severity (%)	Reaction
F189-09-06	1634.00 Aa⁴	100.0Aa	HS	155.26 Bd	31.66Bb	R
Ágata²	1610.33 Aa	100.0Aa	HS	520.00 Ba	80.33Aa	S
RM98-23-05	1609.33 Aa	100.0Aa	HS	422.16 Bb	64.00Ba	MS
Bel	1583.50 Aa	100.0Aa	HS	424.43 Bb	54.70Bb	MS
Macaca	1579.50 Aa	100.0Aa	HS	492.26 Ba	72.70Ba	S
CL02-05	1578.16 Aa	100.0Aa	HS	224.50 Bc	45.33Bb	MR
F23-24-06	1569.83 Aa	100.0Aa	HS	279.33 Bc	46.66Bb	MR
Asterix	1569.50 Aa	100.0Aa	HS	419.00 Bb	70.00Ba	MS
Clara	1547.50 Aa	100.0Aa	HS	366.26 Bb	47.33Bb	MS
Ana	1526.00 Aa	100.0Aa	HS	358.60 Bb	47.00Bb	MS
Bintje²	1501.16 Aa	100.0Aa	HS	385.56 Bb	64.00Ba	MS
F63-01-06	1486.16 Aa	100.0Aa	HS	164.26 Bd	17.00Bc	R
CL20-01-06	1427.16 Ab	100.0Aa	HS	71.00 Be	9.33Bc	HR
C2545-1-06	1320.26 Ac	100.0Aa	HS	40.66 Be	9.00Bc	HR
Eliza	822.93 Ad	81.7Ab	S	30.23 Be	3.66Bd	HR
C2572-3-06	643.60 Ae	74.0Ac	S	4.66 Be	1.00Bd	HR
C2569-1-06	396.33 Af	56.7Ac	MS	0.67 Be	0.33Bd	HR
C2557-2-06	465.66 Af	33.0Ae	MS	4.66 Be	1.00Bd	HR
C2553-1-06	333.33 Ag	44.3Ad	MR	0.67 Be	0.33Bd	HR
C2573-4-06	283.00 Ag	33.0Ae	MR	2.00 Be	1.00Bd	HR
C2550-4-06	175.56 Ah	21.3Af	R	2.00 Be	0.33Bd	HR
C2551-2-06	7.33 Ai	1.0Ag	HR	0.00 Ae	0.00Ad	HR
CIP392.617-54³	0.00 Ai	0.0Ag	HR	0.00 Ae	0.00Ad	HR
CV (%)	6.31	7.52		30.21	25.40

Genotype	Tuber yield (g plot¹)		Tuber yield reducction (%)
	A2 Mating type	A1 Mating type
CIP392.617-54²	2668 Aa³	2804 Ac	4.85^ns
C2573-4-06	2304 Ba	3250 Ab	29.10*
C2569-1-06	2148 Aa	2553 Ac	15.86^ns
C2553-1-06	1581 Bb	3254 Ab	51.41*
C2551-2-06	1532 Ab	1778 Ad	13.85^ns
C2572-3-06	1502 Bb	2772 Ac	45.81*
C2550-4-06	1460 Bb	3792 Aa	65.50*
C2557-2-06	1309 Bb	4012 Aa	32.62*
Eliza	1050 Bc⁺	2386Ac	54.00*
Clara	1048 Bc⁺	1935 Ad⁺	45.83*
Bel	1032 Bc	2549 Ac	59.51*
Ana	877 Bc	2379 Ac	63.13*
F63-01-06	811 Bc	2815 Ac⁺	71.13*
C2545-1-06	681 Bc	1882 Ad	63.81*
Ágata¹	653 Bc	1501 Ad	56.49*
CL20-01-06	648 Ac	922 Ae	29.71^ns
F23-24-06	598 Bc	1709 Ad⁺	65.00*
Bintje¹	536 Bc	1590 Ad⁺	66.28*
Asterix	508 Bc⁺	1496 Ad	66.04*
Macaca	426 Bc	1059 Ae	59.77*
CL02-05	303 Bc	2338 Ac	87.41*
F189-09-06	253 Bc⁺	1040 Ae	75.67*
RM98-23-05	149 Bc	1687 Ad	91.16*
CV (%)	23.03	21.31

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E-mail: caatinga@ufersa.edu.br

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[1] ^* Corresponding author: cesar.gomes@embrapa.br

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REACTION OF POTATO CULTIVARS AND CLONES TO Phytophthora infestans1 1 Paper extracted from the doctoral thesis of the first author.

REAÇÃO DE CULTIVARES E CLONES DE BATATA A Phytophthora infestans

ABSTRACT

REACTION OF POTATO CULTIVARS AND CLONES TO Phytophthora infestans¹ 1 Paper extracted from the doctoral thesis of the first author.