Virulence and molecular diversity of parthenogenetic root-knot nematodes, Meloidogyne spp

Article Abstract:

Parthenogenetic root-knot nematodes (RKN), Meloidogyne spp., have been studied relative to molecular diversity and virulence. These sedentary endoparasites cause great damage to many crops including tomatoes. Genetic diversity and relationships of 17 populations of the three parthenogenetic species of great economic importance have been studied using amplified fragment length polymorphism (AFLP) markers. The three species were clearly distributed into distinct groups, but combination of data for virulence phenotypes and DNA markers showed clustering of populations was not associated with virulence/avirulence against he tomato Mi resistance gene. Likely most of the DNA polymorphisms seen is independent of virulence.

Usage, Plants, DNA testing, DNA identification, Tomatoes, Variation (Biology), Host-parasite relationships, Insect resistance (Plants)

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Differentiation of normal and giant Vicia faba populations of the stem nematode Ditylenchus dipsaci: agreement between RAPD and phenotypic characteristics

Article Abstract:

Two important race groups of the stem nematode, Ditylenchus dipsaci, an obligatory polyphagous endoparasite, attack the bean, Vicia faba. Morphological differences have been found in the two groups and there were corresponding differences in faba bean disease symptoms. Agreement has been found between RAPD and phenotypic characteristics in the nematodes. Variation between D. dipsaci species in populations involved with V. faba was low. No strong correlation was found between geographical origin and morphological or molecular characteristics.

Morphology (Biology), Phenotype, Phenotypes, Legumes, Morphology, Beans

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Uniformity of the nuclear and chloroplast genomes of Spartina maritima (Poaceae), a salt-marsh species in decline along the Western European Coast

Article Abstract:

A study is conducted to evaluate the amount and distribution of genetic variation within and between populations of Spartina maritima along the French Atlantic coast where both healthy and regressing populations occur. The results show an extremely low level of genetic variation in this species, with only one polymorphic nuclear marker, and the presence of two genotypes randomly distributed among the populations.

Science & research, Cord grass, Spartina

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