Reproduction of Meloidogyne arenaria race 2 on Flue-cured tobacco possessing resistance genes Rk1 and/or Rk2

Adamo, Noah; Johnson, Charles S.; Reed, T. David; Eisenback, Jonathan D.

Reproduction of Meloidogyne arenaria race 2 on Flue-cured tobacco possessing resistance genes Rk1 and/or Rk2

Journal of Nematology

Volume 53 (2021): Issue 1 (January 2021)

By:

Noah Adamo, Charles S. Johnson, T. David Reed and Jonathan D. Eisenback

Open Access

|Jan 2021

Figures & Tables

Egg masses, eggs per gram of root, and reproductive indices of Meloidogyne arenaria race 2 on flue-cured tobacco entries from greenhouse pot tests in 2018 and 2019_ a

		Blackstone			Blacksburg
		2019	2018		2018
Genotype	Entry	April–May	April–May	September	September
Egg masses per gram of root
rk1rk2	Hicks	7 a	25 a	2 a	52 ab
RK1rk2	K326	4 a	6 bc	1 a	60 a
rk1RK2	T-15-1-1	1 b	11 ab	0 b	32 b
RK1RK2	CC 13	1 b	3 c	0 b	20 c
RK1RK2	STNCB 2-28	1 b	6 bc	0 b	13 c
Eggs per gram of root
rk1rk2	Hicks	30 a	754 a	1 b	1,038 a
RK1rk2	K326	42 a	60 b	10 ab	1,182 a
rk1RK2	T-15-1-1	8 a	215 ab	2 b	795 a
RK1RK2	CC 13	37 a	53 b	22 a	241 b
RK1RK2	STNCB 2-28	10 a	96 b	4 ab	264 b
Reproductive index ^b
rk1rk2	Hicks	0.1 a	2.2 a	0.0 a	2.4 a
RK1rk2	K326	0.1 a	0.3 b	0.0 a	2.3 a
rk1RK2	T-15-1-1	0.0 a	0.8 b	0.0 a	1.4 b
RK1RK2	CC 13	0.0 a	0.2 b	0.0 a	0.5 c
RK1RK2	STNCB 2-28	0.1 a	0.2 b	0.0 a	0.4 c

Numbers of Meloidogyne arenaria race 2 nematodes observed in roots of flue-cured tobacco entries at six timepoints from field trials in Palmer Springs, VA in 2018 and 2019_ a

		Nematodes/g root
		Weeks after transplanting
Genotype	Entry	3	6	9	12	15	18
2018
rk1rk2	Hicks	1 ab	5 a	47 a	84 a	35 ab	38 a
RK1rk2	K326	2 ab	3 a	25 a	73 ab	32 ab	62 a
rk1RK2	T-15-1-1	1 b	7 a	27 a	49 ab	40 a	31 ab
RK1RK2	CC 13	3 a	5 a	7 a	63 a	11 ab	46 a
RK1RK2	STNCB 2-28	1 ab	3 a	31 a	33 b	8 b	16 b
2019
rk1rk2	Hicks	5 a	9 a	20 ab	55 a	35 a	37 a
RK1rk2	K326	7 a	4 a	26 a	79 a	41 a	32 ab
rk1RK2	T-15-1-1	5 a	14 a	13 ab	20 ab	8 ab	14 ab
RK1RK2	CC 13	2 b	4 a	5 b	39 a	18 ab	16 ab
RK1RK2	STNCB 2-28	5 ab	4 a	13 ab	6 b	5 b	6 b

Root galling by Meloidogyne arenaria race 2 on flue-cured tobacco entries in field trials in Palmer Springs, VA in 2018 and 2019_ a

		Root galling (0–5) ^b
		Weeks after transplanting
Genotype	Entry	3	6	9	12	15	18
2018
rk1rk2	Hicks	0.0 a	0.0 a	0.8 a	0.9 a	1.9 a	2.7 ab
RK1rk2	K326	0.0 a	0.0 a	0.9 a	1.2 a	1.8 a	3.4 a
rk1RK2	T-15-1-1	0.0 a	0.0 a	0.6 a	1.2 a	1.9 a	2.1 ab
RK1RK2	CC 13	0.0 a	0.0 a	0.9 a	0.8 a	1.1 ab	2.5 ab
RK1RK2	STNCB 2-28	0.0 a	0.0 a	0.8 a	0.4 a	0.2 b	1.5 b
2019
rk1rk2	Hicks	0.1 a	0.4 a	2.0 abc	2.0 a	2.0 a	2.4 a
RK1rk2	K326	0.1 a	0.4 a	2.6 ab	2.3 a	2.0 a	2.6 a
rk1RK2	T-15-1-1	0.1 a	0.6 a	3.6 a	1.3 ab	0.7 a	2.6 a
RK1RK2	CC 13	0.2 a	0.0 a	0.4 c	0.5 b	1.3 a	1.8 ab
RK1RK2	STNCB 2-28	0.1 a	0.3 a	0.8 bc	0.3 b	2.0 a	0.8 b

Egg mass and egg production by Meloidogyne arenaria race 2 on flue-cured tobacco entries in field trials in Palmer Springs, VA in 2018 and 2019_ a

		Weeks after transplanting
Genotype	Entry	9	12	15	18
Egg masses per gram of root
2018
rk1rk2	Hicks	2 a	38 a	8 ab	16 ab
RK1rk2	K326	0 a	1 b	1 b	21 a
rk1RK2	T-15-1-1	1 a	11 ab	16 a	19 ab
RK1RK2	CC 13	0 a	24 ab	4 b	21 ab
RK1RK2	STNCB 2-28	0 a	28 ab	1 b	6 b
2019
rk1rk2	Hicks	3 a	14 a	31 a	27 a
RK1rk2	K326	5 a	34 a	39 a	26 ab
rk1RK2	T-15-1-1	4 a	18 a	5 a	4 b
RK1RK2	CC 13	2 a	14 ab	11 a	9 ab
RK1RK2	STNCB 2-28	2 a	1 b	0 a	5 b
Eggs per gram of root
2018
rk1rk2	Hicks	28 a	212 a	38 b	80 a
RK1rk2	K326	50 a	225 a	45 ab	133 a
rk1RK2	T-15-1-1	27 a	105 a	168 a	79 a
RK1RK2	CC 13	22 a	266 a	43 b	95 a
RK1RK2	STNCB 2-28	48 a	445 a	39 b	50 a
2019
rk1rk2	Hicks	684 a	3,885 ab	12,457 a	2,328 a
RK1rk2	K326	473 a	7,686 a	4,673 ab	2,276 a
rk1RK2	T-15-1-1	1,284 a	3,830 ab	2,223 ab	995 a
RK1RK2	CC 13	643 a	3,120 ab	989 b	1,347 a
RK1RK2	STNCB 2-28	1,129 a	1,296 b	1,231 b	793 a

Initial and finial soil nematode counts for flue-cured tobacco entries in field trials in Palmer Springs, VA in 2018 and 2019_ a

		Meloidognye arenaria juveniles/500 cc of soil
Genotype	Entry	Before planting	After final harvest
2018
rk1rk2
RK1rk2	K326	13	2,753
rk1RK2	T-15-1-1	22	1,858
RK1RK2	CC 13	29	1,382
RK1RK2	STNCB 2-28	11	753
2019
rk1rk2	Hicks	64	8
RK1rk2	K326	12	96
rk1RK2	T-15-1-1	60	24
RK1RK2	CC 13	26	44
RK1RK2	STNCB 2-28	50	12

Root galling of flue-cured tobacco entries by Meloidogyne arenaria race 2 in greenhouse pot tests in 2018 and 2019_ a

		Root Galling (0–5) ^b
		Blackstone			Blacksburg
		2019	2018		2018
Genotype	Entry	April–May	April–May	September	September
rk1rk2	Hicks	4.7 a	3.6 b	5.0 a	4.7 a
RK1rk2	K326	2.8 c	3.1 b	3.4 b	4.4 a
rk1RK2	T-15-1-1	3.5 b	4.4 a	3.9 b	4.6 a
RK1RK2	CC 13	2.3 cd	2.6 b	2.1 c	3.0 b
RK1RK2	STNCB 2-28	1.8 d	3.1 b	2.1 c	2.6 b

Numbers of inoculated Meloidogyne arenaria race 2 nematodes observed in roots of flue-cured tobacco entries at the conclusion of greenhouse pot tests in 2018 and 2019_ a

		Nematodes/g feeder root
		Blackstone			Blacksburg
		2019	2018		2018
Genotype	Entry	April–May	April–May	September	September
rk1rk2	Hicks	84 a	55 a	26 a	144 a
RK1rk2	K326	25 bc	28 a	10 b	169 a
rk1RK2	T-15-1-1	50 ab	47 a	9 b	158 a
RK1RK2	CC 13	13 cd	14 b	6 c	69 b
RK1RK2	STNCB 2-28	11 d	26 a	3 c	45 b

DOI: https://doi.org/10.21307/jofnem-2021-042 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X

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Language: English

Page range: 1 - 13

Published on: Jan 1, 2021

Published by: Society of Nematologists, Inc.

In partnership with: Paradigm Publishing Services

Publication frequency: 1 times per year

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© 2021 Noah Adamo, Charles S. Johnson, T. David Reed, Jonathan D. Eisenback, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

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