Parasitism of <i>Meloidogyne exigua</i> races 1 and 2 in coffee plants derived from Timor Hybrid

Pereira, Antonio Alves; Caixeta, Larissa de Brito; Fatobene, Bárbhara Joana dos Reis; Oliveira, Claudio Marcelo Gonçalves; Gonçalves, Wallace; Filho, Oliveiro Guerreiro

doi:10.1590/0103-8478cr20200721

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CROP PROTECTION • Cienc. Rural 51 (7) • 2021 • https://doi.org/10.1590/0103-8478cr20200721 copy

Parasitism of Meloidogyne exigua races 1 and 2 in coffee plants derived from Timor Hybrid

Parasitismo de Meloidogyne exigua raças 1 e 2 em cafeeiros derivados do Híbrido de Timor

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

To investigate the degree of parasitism of two populations of Meloidogyne exigua, the gall index (GI) and the reproduction factor (RF) of M. exigua races 1 (Est E2) and 2 (Est E1) were analyzed in 47 progenies on F_3:4 or F_4:5 generation derived from the crossing between Coffea arabica cv. Catuaí Amarelo and Timor Hybrid. C. canephora cv. Apoatã IAC 2258 and C. arabica cv. Catuaí Vermelho IAC 144 were used as resistance and susceptibility checks, respectively. The genotypes that were classified as resistant or susceptible by RF were similarly classified by GI, showing a close relationship between both methodologies. The data also indicated no differences in virulence between the nematode populations, since the progenies showed similar resistance reactions to the M. exigua races 1 and 2. According to GI from the 47 mother plants evaluated, 27 progenies (57.4%) were classified as resistant to M. exigua races 1 and 2, with GI ranging from 0.0 to 1.4 and 20 progenies (42.6%) were susceptible with GI from 2.6 to 4.4. These results showed that most of the evaluated germplasm was very promising in relation to the development of new Arabica coffee cultivars with resistance to M. exigua.

Key words:
root knot nematode; genetic resistance; Coffea arabica

Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
E-mail: cienciarural@mail.ufsm.br

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[1] E-mail caixetalb@gmail.com. ^*Corresponding author.

Germplasm	------Race 1-----			------Race 2-----			Germplasm	-------Race 1-----				------Race 2----
	GI	GI ≥ 2	C	GI	GI ≥ 2	C		GI	GI ≥ 2	C	GI	GI ≥ 2	C
---------------------------------C. canephora------------------------------							--------------------------------C. arábica------------------------------
Apoatã IAC 2258	0	100	R	0	100	R	CV 144^**	4.4	0	S	4.3	0	S
C 2258 c86 Ad^*	0	100	R	0	100	R
Laurentii col.5	0	100	R	0	100	R
-------------------------------------------C. arabica with introgression of C. canephora (derived fromTimor Hybrid)-------------------------------
Sarchimor IAC 4361	0	100	R	0	100	R
Obatã IAC 1669-20	3.4	0	S	3.7	0	S
---------------------------------------------------------------Catuaí Amarelo X Timor Hybrid--------------------------------------------------------------
H419-3-1-1-14	0	100	R	0	100	R	H419-5-2-1-14	1.4	60	R	0.6	80	R
H419-3-1-3-8	0	100	R	0	100	R	H419-5-3-3-8	0.9	70	R	0.3	90	R
							H419-5-4-5-1	0	100	R	0	100	R
H419-6-3-2-9	0	100	R	1.2	60	R	H419-5-4-5-2	0	100	R	0	100	R
H419-6-3-6-5	0	100	R	0	100	R	H419-5-4-5-10	0	100	R	0	100	R
H419-6-3-6-10	0	100	R	0	100	R	H419-5-5-5-4-1	3.8	0	S	3.4	10	S
							H419-5-5-5-4-10	3.4	0	S	3.7	0	S
H516-2-1-1-18-1	3.9	0	S	2.6	20	S	H419-10-2-1-17	0	100	R	0	100	R
H516-2-1-1-18-2	3.9	0	S	3.2	0	S	H419-10-5-1-15	0	100	R	0	100	R
H516-2-1-1-18-3	4.1	0	S	3.8	0	S	H419-10-6-2-1	0	100	R	0	100	R
H516-2-1-1-18-4	3.5	0	S	3.6	20	S	H419-10-6-2-12	0	100	R	0	100	R
H516-2-1-1-18-5	3.7	0	S	3.5	0	S
H516-2-1-1-18-6	3.7	0	S	3.2	0	S	H514-11-5-5-1	0	100	R	0	100	R
H516-2-1-1-18-7	4.4	0	S	2.8	60	S	H514-11-5-5-4	0	100	R	0	100	R
H516-2-1-1-18-8	4.1	0	S	3.7	0	S	H514-11-5-5-5	0	100	R	0	100	R
H516-2-1-1-18-10	3.4	20	S	2.7	20	S	H514-11-5-5-8	0	100	R	0	100	R
H516-2-1-1-18-11	3.6	0	S	3.2	10	S	H514-11-5-5-9	0	100	R	0	100	R
H516-2-1-1-18-12	3.6	0	S	3.1	0	S	H514-11-5-5-11	0	100	R	0	100	R
H516-2-1-1-18-13	4.2	0	S	3.6	10	S	H514-11-5-5-12	0	100	R	0	100	R
H516-2-1-1-18-15	4	0	S	3.3	0	S	H514-11-5-5-13	0	100	R	0	100	R
H516-2-1-1-18-16	4.1	0	S	3.7	0	S	H514-11-5-5-15	0	100	R	0	100	R
H516-2-1-1-18-17	2.9	30	S	3.4	30	S	H514-11-5-5-16	0	100	R	0	100	R
H516-2-1-1-18-18	4	0	S	3.4	0	S	H514-11-5-5-20	0	100	R	0	100	R

Germplasm	---------------Race 1-------------		--------------Race 2------------
	RF	C^*	RF	C^*
------------------------------------------------------------------------------C. arabica-------------------------------------------------------------------------
Catuaí Vermelho IAC 144	5.1	S	3.1	S
-------------------------------------------------------------------------C. canephora---------------------------------------------------------------------------
Apoatã IAC 2258	0	R	0	R
C 2258 c86 Ad^**	0	R	0	R
Laurentii Col.5	0	R	0	R
------------------------------------------------------------------C. arabica X C. canephora-----------------------------------------------------------------
Sarchimor IAC 4361	0.06	R	0	R
Obatã IAC 1669-20	-	-	4.4	S
---------------------------------------------------------------Catuaí Amarelo X Timor Hybrid--------------------------------------------------------------
H419-3-1-1-14	0	R	-	-
H419-3-1-3-8	0.04	R	-	-
H419-5-2-1-14	-	-	0.05	R
H419-5-4-5-2	0.01	R	-	-
H419-5-4-5-10	0	R	0.01	R
H419-6-3-2-9	0.05	R	0.01	R
H419-6-3-6-5	0.02	R	0	R
H419-10-5-1-15	0.01	R	0	R
H419-10-6-2-1	0.01	R	0	R
H419-10-6-2-12	0	R	0	R
H514-11-5-5-1	0.01	R	0	R
H514-11-5-5-4	0.01	R	0	R
H514-11-5-5-7	-	-	0	R
H514-11-5-5-7^*	-	-	0	R
H514-11-5-5-9	0	R	-	-
H514-11-5-5-12	0.03	R	-	-
H514-11-5-5-14	-	-	0	R
H514-11-5-5-14^*	-	-	0	R
H514-11-5-5-16	0	R	-	-
H514-11-5-5-21	0	R	-	-
H514-11-5-5-22	0	R	-	-

Parameter	‘Catuaí Amarelo x Timor Hybrid’ progenies			----------Total Plant Population---------
	GI	FR	GI	FR
Accuracy of method (AM) _(%)	100	100	100	100
False positive rate (FPR) _(%)	0	0	0	0
False negative rate (FNR) _(%)	0	0	0	0
Total rate error (TRE) _(%)	0	0	0	0
Pearson chi-square (²)	470^*	-	530^*	140^*
Yule association coefficient (Q)	1	1	1	1