Inoculation methods, aggressiveness of isolates and resistance of peach palm progenies to <i>Phytophthora palmivora</i>

Fuzitani, Eduardo Jun; Santos, Álvaro Figueredo dos; Damatto Junior, Erval Rafael; Nomura, Edson Shigueaki; Kalil Filho, Antonio Nascim

doi:10.1590/0100-5405/178476

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ARTIGOS • Summa Phytopathol. 44 (3) • Jul-Sep 2018 • https://doi.org/10.1590/0100-5405/178476 copy

Inoculation methods, aggressiveness of isolates and resistance of peach palm progenies to Phytophthora palmivora

Métodos de inoculação, agressividade de isolados e resistência de progênies de pupunheira à Phytophthora palmivora

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Stem base rot (SBR) caused by Phytophthora palmivora is the main disease affecting peach palm in the nursery and in the field. This study aimed to: a) determine the most appropriate method for P. palmivora inoculation in peach palm; b) assess the aggressiveness of P. palmivora isolates; c) evaluate the resistance of peach palm progenies to P. palmivora. Experiments were carried out at “Embrapa Florestas” from March 2011 to March 2012. A descriptive rating scale was developed to assess SBR severity in peach palm. The disease severity was evaluated 7, 14, 21 and 28 days after inoculation. The conclusions were: a) injection at the stem base was the most effective method for P. palmivora inoculation; b) SA-5, SA-9, SA-10, SA-11, SA-14, SA-15, SA-16, SA-30 and SA-31 were the most aggressive P. palmivora isolates; and c) peach palm progenies T2, T4, T7, T9 and T15 showed resistance to P. palmivora.

Keywords
Bactris gasipaes; palm heart; phytopathology

Isolates		Severity (Score)								Mean		AUDPC	Incidence
Isolates		7 days		14 days		21 days		28 days		Mean		AUDPC	(%)
SA-30		0.7	a A	1.8	a B	3.0	b C	3.8	b D	1.9	B	31.5	100
SA-31		0.8	a A	1.7	a B	3.0	b C	3.5	b C	2.2	C	36.5	100
SA-10		0.5	a A	1.5	a B	2.5	a C	3.4	b D	2.0	B	31.0	100
SA-11		0.4	a A	1.5	a B	2.5	a C	3.8	b D	2.0	B	31.4	100
SA-12		0.2	a A	1.1	a B	2.0	a C	2.9	a D	1.5	A	23.9	80
SA-14		0.6	a A	1.7	a B	3.2	b C	3.8	b C	2.3	C	36.6	100
SA-16		0.8	a A	1.8	a B	3.2	b C	3.5	b C	2.3	C	37.0	100
SA-17		0.4	a A	1.0	a A	2.2	a B	3.0	a B	1.6	A	21.7	90
SA-05		0.5	a A	1.7	a B	3.1	b C	3.9	b D	2.3	C	36.1	100
SA-09		0.6	a A	1.4	a B	2.7	a C	3.6	b D	2.1	B	32.0	100
SA-15		0.7	a A	1.5	a A	3.4	b B	3.6	b B	2.3	C	36.3	100
SA-SP		0.8	a A	1.6	a B	2.2	a C	3.1	a C	1.9	B	29.9	90
Mean		0.6	A	1.5	B	2.7	C	3.5	D
CV (%)	33.7

Progenies	Severity (Score)								Mean		AUDPC	Incidence
Progenies	7 days		14 days		21 days		28 days		Mean		AUDPC	(%)
T1	1.0	a A	2.5	b B	2.6	b B	3.8	b C	2.5	c	39.2	100
T2	1.0	a A	1.7	a B	2.1	a B	3.3	a C	2.0	a	31.1	90
T3	0.9	a A	2.5	b B	2.9	c B	3.8	b B	2.5	c	40.4	100
T4	0.8	a A	2.1	a B	3.0	c C	3.5	a D	2.4	b	37.7	100
T5	1.0	a A	2.6	b B	2.8	c B	4.0	b C	2.6	c	41.3	100
T6	0.6	a A	2.1	a B	3.0	c C	4.0	b D	2.4	b	38.3	100
T7	1.0	a A	2.0	a B	2.2	a B	3.2	a C	2.1	a	33.0	100
T8	1.5	b A	3.0	c B	3.0	c b	4.0	b C	2.9	d	46.0	100
T9	1.8	c A	2.2	a B	2.5	b B	3.5	a C	2.5	c	38.7	100
T10	1.2	a A	2.7	b B	2.8	c B	3.8	b C	2.6	c	41.9	100
T11	2.0	c A	2.5	b B	2.8	c B	4.0	b C	2.8	d	43.7	100
T12	1.4	b A	2.8	c B	3.0	c B	4.0	b C	2.8	d	44.6	100
T13	1.9	c A	2.6	b B	2.9	c B	3.8	b C	2.8	d	44.0	100
T14	1.3	b A	2.5	b B	3.0	c C	4.0	b D	2.7	c	42.6	100
T15	1.4	b A	2.6	b B	2.8	c B	3.6	a C	2.6	c	41.5	100
T16	1.0	a A	3.0	c B	3.0	c B	3.7	b C	2.8	c	43.7	100
T17	1.5	b A	3.0	c B	2.9	c B	4.0	b B	2.8	d	45.5	100
T18	1.3	b A	2.4	c B	2.9	c C	4.0	b D	2.6	c	41.6	100
Mean	1.3	A	2.5	B	2.8	C	3.8	D
CV (%)	17.7

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[1] Autor para correspondencia: Álvaro Figueredo dos Santos (alvaro.santos@embrapa.br)