Comparison of migration, penetration, development and reproduction of Meloidogyne graminicola on susceptible and resistant rice genotypes

Migration, penetration, development and reproduction of the rice root-knot nematode, Meloidogyne graminicola, in the resistant African rice genotypes TOG5674, TOG5675, CG14 and RAM131, and in the susceptible Asian rice genotypes IR64 and UPLRi-5 were studied and compared. The number of second-stage juveniles (J2) that had migrated horizontally and vertically towards the rhizosphere at 48 h after inoculation was comparable in both resistant and susceptible rice genotypes. Penetration of J2 was significantly lower in the resistant rice genotypes compared with the susceptible rice genotypes at 3 and 7 days after inoculation (DAI). Nematode development in the resistant rice genotypes was slower than in the susceptible rice genotypes. Nematode reproduction was significantly lower in the resistant rice genotypes, which supported fewer eggs per g of roots and eggs per female. A significantly higher percentage of egg-laying females was found in the susceptible rice genotypes. Mature females that had developed in the resistant rice genotypes were significantly smaller than the ones in the susceptible rice genotypes. The resistant rice genotypes had significantly fewer galls than the susceptible rice genotypes.

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Effects of initial nematode population density and water regime on resistance and tolerance to the rice root-knot nematode Meloidogyne graminicola in African and Asian rice genotypes

International Journal of Pest Management ◽

10.1080/09670874.2017.1390623 ◽

2017 ◽

Vol 64 (3) ◽

pp. 252-261

Author(s):

Ma. Teodora Nadong Cabasan ◽

Arvind Kumar ◽

Dirk De Waele

Keyword(s):

Population Density ◽

Water Regime ◽

Nematode Population ◽

Rice Root ◽

Root Knot Nematode ◽

Meloidogyne Graminicola ◽

Asian Rice ◽

Nematode Population Density ◽

Rice Genotypes

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Evaluation of resistance and tolerance of rice genotypes from crosses of Oryza glaberrima and O. sativa to the rice root-knot nematode, Meloidogyne graminicola

Tropical Plant Pathology ◽

10.1007/s40858-018-0210-8 ◽

2018 ◽

Vol 43 (3) ◽

pp. 230-241 ◽

Cited By ~ 4

Author(s):

Ma. Teodora Nadong Cabasan ◽

Arvind Kumar ◽

Dirk De Waele

Keyword(s):

Rice Root ◽

Oryza Glaberrima ◽

Root Knot Nematode ◽

Meloidogyne Graminicola ◽

Rice Genotypes

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Infestation of Rice Root-Knot Nematode in Rice Nurseries in Chitwan

Nepal Journal of Science and Technology ◽

10.3126/njst.v10i0.2822 ◽

1970 ◽

Vol 10 ◽

pp. 45-49 ◽

Cited By ~ 5

Author(s):

N. K. Dangal ◽

S. M. Shrestha ◽

D. Sharma Poudyal ◽

C. Adhikari

Keyword(s):

Management Practices ◽

Rice Root ◽

Main Field ◽

Root Knot Nematode ◽

Meloidogyne Graminicola ◽

Second Stage ◽

Stage Juvenile ◽

Natural Infestation ◽

Dry Soil ◽

June July

A survey was conducted during June-July 2006 in Chitwan to find out the natural infestation of rice root-knot nematode (Meloidogyne graminicola Golden & Brichfield) in rice nurseries. Thirty nurseries were surveyed and 100 seedlings from each nursery were evaluated. Field survey revealed that M. graminicola was widely distributed in most rice growing areas of Chitwan District. Rice root-knot disease was more prevalent in dry bed condition than wet bed. Most of the farmers grew seedlings in upland (dry) soil and there was more rice root-knot disease and second stage juvenile (J2) population in both nursery soil and seedling root. The galled (diseased) seedlings had significantly shorter roots and shoots. Most of the farmers did not know about the nematode problem and did not follow any management practices to control it in nurseries and/or in the main field. This indicated high risk of multiplication of the nematodes and huge loss in rice production. Thus, it is essential to manage M. graminicola in rice nurseries in order to produce healthy seedlings.Key words: Dry bed; Lowland; Meloidogyne graminicola; Upland; Wet bedDOI: 10.3126/njst.v10i0.2822Nepal Journal of Science and Technology Volume 10, 2009 December Page: 45-49

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Effect of Rice Root-Knot Nematode on Growth and Yield of Yellow Granex Onion

Plant Disease ◽

10.1094/pdis.2002.86.12.1339 ◽

2002 ◽

Vol 86 (12) ◽

pp. 1339-1344 ◽

Cited By ~ 6

Author(s):

E. B. Gergon ◽

S. A. Miller ◽

J. M. Halbrendt ◽

R. G. Davide

Keyword(s):

Cropping Systems ◽

Economic Loss ◽

The Philippines ◽

Rice Root ◽

Growth And Yield ◽

Yield Losses ◽

Root Knot Nematode ◽

Meloidogyne Graminicola ◽

Second Stage ◽

Infested Field

Rice root-knot nematode, Meloidogyne graminicola, infects all commercially grown onion cultivars in rice-onion cropping systems in the Philippines, but its economic importance has not been established. The effects of different preplant population levels (Pi) of M. graminicolaon Yellow Granex onion in pots and of different percentages of galled roots in a naturally infested field were evaluated. Leaf weight and root length of ‘Yellow Granex 429’ seedlings decreased with increasing Pi, while low Pi mildly stimulated plant height at the vegetative growth stage. Age of transplant and Pi influenced growth and yield of onion at maturity. Onion yield and root and leaf weights decreased as the age of the transplants increased. Growth and yield decreased with increased Pi. Bulb weight was reduced by 7 to 82% and diameter by 10 to 62% when plants were inoculated with 50 to 10,000 second-stage juveniles. Onion bulbs from the field were reduced by 16, 32, and 35% in weight and by 6, 17, and 18% in diameter when the percentage of roots galled was 10, 50, and 100%, respectively. Management of M. graminicolapopulations at the start of the growing season must be part of onion culture in rice-onion systems to reduce onion yield losses and to prevent economic loss.

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Resistance to rice root-knot nematode Meloidogyne graminicola identified in Oryza longistaminata and O. glaberrima

Nematology ◽

10.1163/156854199508397 ◽

1999 ◽

Vol 1 (4) ◽

pp. 395-398 ◽

Cited By ~ 47

Author(s):

Imelda R. Soriano ◽

Veronique Schmit ◽

Darshan S. Brar ◽

Jean-Claude Prot ◽

Georges Reversat

Keyword(s):

Rice Root ◽

Initial Population ◽

Root Knot Nematode ◽

Sources Of Resistance ◽

Meloidogyne Graminicola ◽

African Rice ◽

Oryza Longistaminata ◽

Sources De Résistance

Abstract Accessions of Oryza longistaminata and O. glaberrima, two rice species from Africa, and O. sativa were screened to identify sources of resistance to Meloidogyne graminicola. An initial population of 6000 J2/plant was inoculated to cuttings of the African rice species and 5-day-old seedlings of O. sativa. Root nematode densities were estimated 60 days after the last inoculation. O. sativa entries were all susceptible to the rice root-knot nematode. One accession of O. longistaminata represented by two individuals (WL02-2 and WL02-15) and three accessions of O. glaberrima (TOG7235, TOG5674 and TOG5675) were resistant to M. graminicola. DL01-1, an O. longistaminata accession, was susceptible to the rice root-knot nematode. Identification de sources de resistance a Meloidogyne graminicola chez Oryza longistaminata et O. glaberrima - Plusieurs accessions d'Oryza longistaminata et d'O. glaberrima, deux riz africains, et d'O. sativa ont ete criblees pour trouver des sources de resistance a Meloidogyne graminicola. Des inoculums de 6000 J2 par plante ont ete inocules sur des boutures des deux riz africains et sur des plantules de 5 jours d'O. sativa. Les populations presentes dans les racines ont ete evaluees 60 jours apres l'inoculation. Toutes les varietes testees d'O. sativa etaient sensibles. Une accession d'O. longistaminata, representee par deux individus (WLO2-2 et WLO2-15), et trois accessions d'O. glaberrima (TOG7235, TOG5674 et TOG5675) etaient resistantes.

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