Host suitability of peppers to the false root-knot nematode Nacobbus aberrans

2016 ◽  
Vol 79 ◽  
pp. 15-19 ◽  
Author(s):  
Paola Lax ◽  
Juan Climaco Rondan Dueñas ◽  
Diego Ramos ◽  
Marcelo Edmundo Doucet ◽  
Renato Braga ◽  
...  
Keyword(s):  
Host Suitability ◽  
Root Knot Nematode ◽  
Nacobbus Aberrans

Host suitability of summer cover crops to Meloidogyne arenaria, M. enterolobii, M. incognita and M. javanica

Nematology ◽  
2021 ◽  
pp. 1-9
Author(s):  
Hung X. Bui ◽  
Johan A. Desaeger
Keyword(s):  
Cover Crops ◽  
Nematode Species ◽  
Host Suitability ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Root Knot Nematode ◽  
Sunn Hemp ◽  
Host Status ◽  
Susceptible Control ◽  
Sorghum Sudangrass

Summary Cover crops can be a useful tool for managing plant-parasitic nematodes provided they are poor or non-hosts for the target nematode species. A glasshouse experiment was done to determine the host status of four common cover crops in Florida, sunn hemp, cowpea, sorghum sudangrass and sunflower, to pure populations of four common tropical root-knot nematode (RKN) species Meloidogyne javanica (Mj), M. incognita (Mi), M. enterolobii (Me) and M. arenaria (Ma). Tomato was included as a susceptible control. Eight weeks after nematode inoculation (WAI), tomato showed the highest root gall damage for all tested RKN species, with gall indices (GI) between 7 (Ma) and 8.5 (Me) and reproduction factor (RF) ranging from 20 (Ma) to 50 (Mj). No visible root galls were observed for any of the RKN species on sunn hemp and sorghum sudangrass at 8 WAI. However, Mj and Mi were able to reproduce slightly on sorghum sudangrass (RF = 0.02 and 0.79, respectively). Sunflower and cowpea were infected by all four tested RKN species, but host suitability varied. Sunflower root galling ranged from 1.1 (Me) to 4.5 (Mj) and RF = 3.2 (Me) to 28.7 (Mj), while cowpea root galling ranged from 0.6 (Mi) to 5.1 (Me) and RF = 0.8 (Mi) to 67.3 (Mj). Sunn hemp and, to a lesser extent, sorghum sudangrass were poor hosts to all four tested RKN species. Sunflower was a good host to all RKN species, but root gall damage and RF were lowest for Me. Cowpea was a good host to Mj, Me and Ma, but a poor host to Mi. Our results confirm and stress the importance of RKN species identification when selecting cover crops as an RKN management strategy.

External secretions from the false root-knot nematode, Nacobbus aberrans

Nematologica ◽  
1998 ◽  
Vol 44 (3) ◽  
pp. 326-330 ◽  
Author(s):  
K. Evans ◽  
J. Rowe ◽  
N. VON MEN-DE ◽  
M. Gravato-Nobre ◽  
R.H. MANZANILLA-LόPEZ
Keyword(s):  
Root Knot Nematode ◽  
Nacobbus Aberrans

scholarly journals A Search for Resistance in Lycopersicon spp. to Nacobbus aberrans

Plant Disease ◽  
1997 ◽  
Vol 81 (2) ◽  
pp. 217-221 ◽  
Author(s):  
J. C. Veremis ◽  
G. B. Cap ◽  
P. A. Roberts
Keyword(s):  
Interspecific Hybrids ◽  
Germ Plasm ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Nematode Reproduction ◽  
Meloidogyne Spp ◽  
Nacobbus Aberrans ◽  
Lycopersicon Cheesmanii ◽  
Greenhouse Tests

Accessions of Lycopersicon cheesmanii, L. chmielewskii, L. esculentum var. cerasiforme, L.hirsutum, L. parviflorum, L. peruvianum, L. pennellii, L. pimpinellifolium, and three interspecific hybrids of L. peruvianum with L. esculentum, were screened for resistance to the false root-knot nematode (Nacobbus aberrans) in greenhouse tests. Variability in nematode reproduction levels was observed within L. chmielewskii accessions LA 2695 and LA 2663 in initial tests with N. aberrans from Argentina; however, interspecific hybrids of L. esculentum cv. UC-82 × L. chmielewskii LA 2695, L. esculentum cv. UC-82 × L. chmielewskii LA 2663, and all the parent plants were susceptible in subsequent tests to the isolate of N. aberrans from Argentina and to an isolate from Mexico. The interspecific hybrids that possess the gene Mi and additional novel resistance to Meloidogyne spp. (root-knot nematodes) and all other exotic tomato accessions tested were susceptible to N. aberrans in our tests. Thus, we have been unable to identify or confirm resistance to two N. aberrans isolates in a range of Lycopersicon germ plasm accessions, including those that possess genes for resistance to root-knot nematodes.

scholarly journals The structure of syncytia induced by the phytoparasitic nematode Nacobbus aberrans in tomato roots, and the possible role of plasmodesmata in their nutrition

1977 ◽  
Vol 23 (1) ◽  
pp. 299-313
Author(s):  
M.G. Jones ◽  
H.L. Payne
Keyword(s):  
Light And Electron Microscopy ◽  
Transformed Cells ◽  
Root Knot Nematode ◽  
Sieve Elements ◽  
Tomato Roots ◽  
Solute Movement ◽  
Nacobbus Aberrans ◽  
Symplastic Pathway ◽  
Massive Accumulation

The structure of syncytia induced within galls in tomato roots by the false root-knot nematode Nacobbus aberrans has been examined by light and electron microscopy. A syncytium develops by breakdown or individual cell walls, which allows movement of cytoplasmic contents between transformed cells. The wall breakdown takes place at pit fields, where the plasmodesmata may be protected from digestion until the surrounding wall is removed. Numerous sieve elements differentiate in the cells outside the syncytium. These sieve elements, and also plasmodesmata in pit fields, are demonstrated by fluorescence microscopy. The possibility of a symplastic pathway of solute movement from the phloem to the syncytium is suggested. A massive accumulation of starch occurs in the gall cells and syncytial cells, which may be related to the proliferation of phloem. Wall ingrowths typical of transfer cells are absent, and a comparative survey of the structure and mode of solute entry into nematode-transformed cells in which ingrowths are present or absent is presented.

scholarly journals Host suitability of weeds and forage species to root-knot nematode meloidogyne graminicola as a funcion of irrigation management

2014 ◽  
Vol 32 (3) ◽  
pp. 555-561
Author(s):  
R.R.D. Negretti ◽  
R. Manica-Berto ◽  
D. Agostinetto ◽  
L. Thürmer ◽  
C.B. Gomes
Keyword(s):  
Plant Species ◽  
Irrigation Management ◽  
Host Suitability ◽  
Rice Cultivation ◽  
Alternanthera Philoxeroides ◽  
Raphanus Raphanistrum ◽  
Root Knot Nematode ◽  
Irrigated Rice ◽  
Nematode Reproduction ◽  
Meloidogyne Graminicola

The irrigated rice production can be limited by various phytopathogenic agents, including root-knot nematodes (Meloidogyne spp.). Thus, the aim of this research was to check the host suitability of plant species most often found off-season and during rice cultivation, to root-knot nematode Meloidogyne graminicola, under two irrigation managements. Two experiments were conducted in a completely randomized design. In the first experiment seven plant species that occur in an area of rice cultivation, in fallow, off-season were evaluated. For the second experiment nine weed species infesting the irrigated rice culture were tested in rainfed and flooding conditions. The sixteen species, kept individually in pots with sterilized substrate, were inoculated with 5,000 eggs and second stage juveniles (J2) of nematode. BRS 410 IRGA rice plants inoculated with M.graminicola were used as control. Two months after inoculation, the root system of each plant was evaluated for number of galls and nematode reproduction factor. It was verified that the species of off-season of rice cultivation Sida rhombifolia, Raphanus raphanistrum, Spergula arvensis, Lotus corniculatus and Trifolium repens, and, during the cycle of rice cultivation, Aeschynomene denticulata, Leersia hexandra, are immune to nematode. The plant species off-season, Avena strigosa and Lolium multiflorum and of cultivation, Alternanthera philoxeroides, red rice, Echinochloa crusgalli, Cyperus difformis, Cyperus esculentus, Cyperus iria and Fimbristylis miliacea would behave as hosts of M.graminicola, mostly under rainfed conditions.

scholarly journals Histopathology of Andean Potato (Solanum tuberosum Andigenum group) varieties parasitized by the false root-knot nematode, Nacobbus aberrans

2018 ◽  
Vol 78 (4) ◽  
pp. 679-685
Author(s):  
M. del C. Tordable ◽  
A. J. Andrade ◽  
M. E. Doucet ◽  
P. Lax
Keyword(s):  
Solanum Tuberosum ◽  
Close Association ◽  
Central Zone ◽  
Limiting Factors ◽  
Root Knot Nematode ◽  
Factors Affecting ◽  
Hyperplastic Tissue ◽  
Andean Potato ◽  
Nacobbus Aberrans ◽  
Histopathological Studies

Abstract Landraces of the Solanum tuberosum Andigenum group are abundant and diverse. They are a valuable genetic resource possessing resistance to pests, diseases, and environmental stresses. In the Andean region, populations of the false root-knot nematode Nacobbus aberrans became specialized to infect native potatoes, being one of the major limiting factors affecting this crop. A better understanding of the host plant-parasite interactions is important in order to select tolerant or resistant plants to be included in management programs. Despite the close of association of N. aberrans with potato, and the great diversity of the S. tuberosum Andigenum group, few histopathological studies have been conducted. The aim of this work was to analyze histological alterations induced by different Argentine populations of the nematode in naturally infested roots of four Andean potato varieties (Collareja, Negra Imilla, Ojo de Señorita and Colorada). All the varieties showed hyperplastic tissue in the central zone of galls, where syncytia developed in close association with the nematode female. Syncytia were composed of modified hyperplastic tissue and parenchyma xylem cells. The results showed differences among varieties in their response to nematode populations, with Ojo de Señorita and Negra Imilla being the most susceptible ones. This study is the first describing histopathological alterations induced by N. aberrans in susceptible Andean potato landraces.

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