Reproductive, pathogenic and genotypic characterisation of five Meloidogyne graminicola populations from the Philippines on susceptible and resistant rice varieties

in Nematology
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Five populations of Meloidogyne graminicola isolated from different rice-growing areas in the Philippines were characterised. The populations showed little phenotypic variability of second-stage juveniles and female perineal pattern. Differences in reproduction among M. graminicola populations were not observed on mature resistant Oryza glaberrima varieties ‘TOG5674’, ‘TOG5675’, ‘RAM131’ and ‘CG14’, or on susceptible O. sativa varieties ‘IR64’ and ‘UPLRi-5’. In all infected rice varieties, plant growth and yield-contributing traits showed no differences among the populations. A search on M. graminicola populations from the Philippines for single-nucleotide polymorphism on the sequences of Internal Transcribed Spacer (ITS) of rDNA genes and mtDNA indicated only few points of heteroplasmy. Nematode reproduction and disease induction of the five M. graminicola populations in the Philippines exerted the same level of aggressiveness and virulence. The absence of resistance-breaking populations of M. graminicola is important for the maintenance of durability of resistance to this important rice pathogen.

Reproductive, pathogenic and genotypic characterisation of five Meloidogyne graminicola populations from the Philippines on susceptible and resistant rice varieties

in Nematology



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    Agro-ecology of the sampled areas.

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    Collection sites in the Philippines of the Meloidogyne graminicola populations studied.

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    List of mitochondrial DNA amplification and sequencing primers used in this study.

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    Perineal patterns of mature females of Meloidogyne graminicola populations from the Philippines. A: Batangas; B: Bulacan; C: Cotabato; D: Laguna; E: Tarlac. Striae converging into a tetragonal web (w) near the tail (t) terminus dorsal to the vulva (v). (Scale bar = 20 μm.)

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    Morphometrics of the second-stage juveniles (J2) of five Meloidogyne graminicola populations collected from different rice-growing areas in the Philippines (n = 18 for each population), and populations from USA and Nepal. Values are in μm and in the form: mean ± standard deviation (range).

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    Mitochondrial heteroplasmic single-nucleotide polymorphisms.

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    Reproduction of five populations of Meloidogyne graminicola from the Philippines on resistant (R) and susceptible (S) rice varieties, and severity of root galling at maturity.

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    Fresh root and shoot weight, and plant height at maturity of resistant (R) and susceptible (S) rice varieties inoculated with five different populations of Meloidogyne graminicola from the Philippines, and percentage reduction when compared with non-inoculated control plants.

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    Yield component parameters of resistant (R) and susceptible (S) rice varieties inoculated with five different populations of Meloidogyne graminicola from the Philippines, and percentage reduction when compared with non-inoculated control plants.

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    Yield-contributing traits data of resistant (R) and susceptible (S) rice varieties inoculated with five different populations of Meloidogyne graminicola populations (6000 second-stage juveniles plant−1) from the Philippines, and percentage change when compared with no-inoculated control plants.

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    Average fresh root weight and average percentage change in plant growth data and yield-contributing traits of resistant (R) and susceptible (S) rice varieties inoculated with five Meloidogyne graminicola populations (6000 second-stage juveniles plant−1) from the Philippines compared with non-inoculated control plants for each rice variety, and for the resistant and susceptible varieties combined.

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    Effect of the five Meloidogyne graminicola populations from the Philippines on the number of juveniles per root system and the yield reduction of four resistant (R) and two susceptible (S) rice genotypes grown in a sandy loam soil in the glasshouse. Number of nematodes initially inoculated (Pi): 6000 second-stage juveniles (J2) plant−1. Median boxplot with 25-75% (boxes) and minimum-maximum (error bars) values.


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