<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The ability of <italic>Meloidogyne enterolobii</italic> to reproduce on selected sweetpotato (<italic>Ipomoea batatas</italic>) cultivars (Beauregard, Covington, Evangeline, Hernandez, and Orleans (LA 05-111)) was evaluated in two greenhouse experiments, each with 10 replicates. All cultivars, except Beauregard (control) and Orleans, were reported previously as moderately resistant or resistant to <italic>M. incognita, Fusarium oxysporum</italic> f. sp. <italic>batatas</italic>, and <italic>Streptomyces ipomoeae</italic>. Plants were inoculated with <italic>M. enterolobii</italic> (5,000 eggs/plant) and arranged in a completely randomized design in a greenhouse with an average daily temperature of 24.8°C. Galls and egg masses per root system (0-5 scale), eggs per egg mass, eggs per gram of fresh root (gfr), and reproduction factor (RF) were determined. <italic>Meloidogyne enterolobii</italic> infected and reproduced on all the sweetpotato cultivars. The nematode induced galls on both fibrous and storage roots, regardless of the cultivar, as well as induced necrosis and cracks on storage roots. The lesions and cracks on the storage roots were more visually pronounced on Hernandez than those on other cultivars. Cultivar Orleans sustained less root galling and egg masses than other cultivars (<italic>p</italic> ≤ 0.01), and both Orleans and Beauregard cultivars had less eggs per gfr and a lower RF than Covington (5,683 eggs/gfr; RF = 16.92), Evangeline (7,161 eggs/gfr; RF = 30.01), and Hernandez (6,979 eggs/gfr; RF = 22.6). The latter two cultivars sustained the largest amount of reproduction of <italic>M. enterolobii</italic>. The number of eggs per egg mass ranged from 462 to 503 and was similar among all cultivars. In summary, <italic>M. enterolobii</italic> reproduced well on all sweetpotato cultivars; however, differences were observed among cultivars (<italic>p</italic> ≤ 0.001). The host status as previously reported for other root-knot nematode species was not a good predictor of host status to <italic>M. enterolobii</italic>. Some sweetpotato cultivars that were reported as resistant or moderately resistant to <italic>M. incognita</italic> race 3, such as Evangeline and Hernandez, were among the best hosts to <italic>M. enterolobii</italic>. Root growth of Evangeline and Orleans, but not of the other cultivars, was negatively correlated with nematode eggs per gfr.</p>
</abstract>

The ability of Meloidogyne enterolobii to reproduce on selected sweetpotato (Ipomoea batatas) cultivars (Beauregard, Covington, Evangeline, Hernandez, and Orleans (LA 05-111)) was evaluated in two greenhouse experiments, each with 10 replicates. All cultivars, except Beauregard (control) and Orleans, were reported previously as moderately resistant or resistant to M. incognita, Fusarium oxysporum f. sp. batatas, and Streptomyces ipomoeae. Plants were inoculated with M. enterolobii (5,000 eggs/plant) and arranged in a completely randomized design in a greenhouse with an average daily temperature of 24.8°C. Galls and egg masses per root system (0-5 scale), eggs per egg mass, eggs per gram of fresh root (gfr), and reproduction factor (RF) were determined. Meloidogyne enterolobii infected and reproduced on all the sweetpotato cultivars. The nematode induced galls on both fibrous and storage roots, regardless of the cultivar, as well as induced necrosis and cracks on storage roots. The lesions and cracks on the storage roots were more visually pronounced on Hernandez than those on other cultivars. Cultivar Orleans sustained less root galling and egg masses than other cultivars (p ≤ 0.01), and both Orleans and Beauregard cultivars had less eggs per gfr and a lower RF than Covington (5,683 eggs/gfr; RF = 16.92), Evangeline (7,161 eggs/gfr; RF = 30.01), and Hernandez (6,979 eggs/gfr; RF = 22.6). The latter two cultivars sustained the largest amount of reproduction of M. enterolobii. The number of eggs per egg mass ranged from 462 to 503 and was similar among all cultivars. In summary, M. enterolobii reproduced well on all sweetpotato cultivars; however, differences were observed among cultivars (p ≤ 0.001). The host status as previously reported for other root-knot nematode species was not a good predictor of host status to M. enterolobii. Some sweetpotato cultivars that were reported as resistant or moderately resistant to M. incognita race 3, such as Evangeline and Hernandez, were among the best hosts to M. enterolobii. Root growth of Evangeline and Orleans, but not of the other cultivars, was negatively correlated with nematode eggs per gfr.

Reproduction of <italic>Meloidogyne enterolobii</italic> on selected root-knot nematode resistant sweetpotato (<italic>Ipomoea batatas</italic>) cultivars

Journal of Nematology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Reproduction of  on selected root-knot nematode resistant sweetpotato () cultivars

running-head

Host status of selected sweetpotato cultivars:

The ability of Meloidogyne enterolobii to reproduce on selected sweetpotato (Ipomoea batatas) cultivars (Beauregard, Covington, Evangeline, Hernandez, and...

Factor	Fibrous fresh root weight^u (g)	Gall index^v	Egg mass index^v	Eggs per egg mass	Eggs per fibrous fresh root weight	Eggs per gram fresh root^x	RF^w
Sweetpotato cultivar ^t
Beauregard	15.21 bc	4.65 a	3.65 b	475 a	30,975 c	2,668 c	6.20 c
Covington	14.99 bc	4.25 a	4.45 ab	490 a	84,585 b	5,683 ab	16.92 b
Evangeline	22.70 a	4.65 a	4.80 a	503 a	150,070 a	7,161 a	30.01 a
Hernandez	16.35 b	4.70 a	4.90 a	462 a	113,235 b	6,979 a	22.65 b
Orleans	11.65 c	1.95 b	2.30 c	475 a	42,022 c	3,678 bc	8.41 c
Test
Test 1	15.42	4.24	4.22	504	81,325	5,444	16.27
Test 2	16.94	3.84	3.82	459	87,030	5,024	17.41
F probability cv	< 0.001	< 0.001	< 0.001	> 0.50	< 0.001	< 0.001	< 0.001
F probability test	0.12	0.06	0.10	> 0.50	0.46	0.50	0.46
Tomato	37.7	5	5	n/a^x	176,340	4,801	35.27

Reproduction of Meloidogyne enterolobii on selected root-knot nematode resistant sweetpotato (Ipomoea batatas) cultivars

Data publikacji: 21 lip 2020

Zakres stron: 1 - 6

Otrzymano: 20 kwi 2020

DOI: https://doi.org/10.21307/jofnem-2020-063

Słowa kluczowe
Guava root-knot nematode, Pacara earpod tree root-knot nematode, Reproduction, Root-knot nematode, Susceptibility, Sweetpotato

© 2020 Janete A. Brito et al., published by Sciendo.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1:

Response of five sweetpotato (Ipomaea batatas) cultivars to inoculation with Meloidogyne enterolobii in this study.

Reproduction of Meloidogyne enterolobii on selected root-knot nematode resistant sweetpotato (Ipomoea batatas) cultivars

Data publikacji: 21 lip 2020

Zakres stron: 1 - 6

Otrzymano: 20 kwi 2020

DOI: https://doi.org/10.21307/jofnem-2020-063

Słowa kluczoweGuava root-knot nematode, Pacara earpod tree root-knot nematode, Reproduction, Root-knot nematode, Susceptibility, Sweetpotato

© 2020 Janete A. Brito et al., published by Sciendo.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1:

Response of five sweetpotato (Ipomaea batatas) cultivars to inoculation with Meloidogyne enterolobii in this study.

Słowa kluczowe
Guava root-knot nematode, Pacara earpod tree root-knot nematode, Reproduction, Root-knot nematode, Susceptibility, Sweetpotato