title: [Genetic-physiological compatibility and karyotypes of stem nematode].
abstract: The paper presents literary and the authors own data. The potato stem eelworm Ditylenchus destructor has a set of chromosomes 2n=44-48 and does not cross with the close species D. dipsaci from onion, garlic, parsley and parsnip. Most stem eelworms of the collective species D. dipsaci have n=12 and cross with each other producing fertile progeny. Some forms of stem eelworms, e.g. those of broad beans, plantain, dandelion and falcaria are polyploid. Intraspecies and intrapopulation polymorphism according to the number of chromosomes was recorded. Some races do not cross, some cross but unilaterally, some races produce sterile, non-viable or little viable hybrids. The species D. dipsaci should be regarded not only as a complex of species but as a group of forms at different stages of intraspecies differentiation.
mesh_terms: D000818:Animals; D002875:Chromosomes; D003433:Crosses, Genetic; D007621:Karyotyping; D008954:Models, Biological; D009348:Nematoda / Q000166:cytology / Q000502:physiology*; D010944:Plants / Q000469:parasitology*; D011110:Polymorphism, Genetic; D014675:Vegetables
vernacular_title: O genetiko-fiziologicheskoĭ sovmestimosti i kariotipakh steblevykh nematod