Studies in bulk crosses between some beet strains
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Studies on fertility of DDK mice: reciprocal crosses between DDK and C57BL/6J strains and experimental transplantation of the ovary.
The fertility of DDK mice was investigated in reciprocal crosses between DDK and C57BL/6J strains of mice. When mated to C57BL males, DDK females were semi-sterile. By contrast, when C57BL females were mated to DDK males, they showed better fertility than in the intra-strain mating. Embryological study has revealed that the low fertility of DDK females is caused by embryonic death at the morula...
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Guinea pigs normally have only 3 toes on the hind feet. This is the condition in all of the wild species of the family Caviidae. Atavistic return of the little toe is not, however, especially uncommon. CASTLE (1906) noticed an animal with an imperfect little toe and by inbreeding and selection developed a strain in which every animal had 4 perfect digits on the hind feet. Strain D, in my posses...
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Mutator activity associated with the common male recombination (MR) chromosomes in Drosophila melanogaster appears to be suppressed in natural populations. Crosses between geographically separated populations, however, lead to the release of mutator activity as measured by a significant increase in visible mutations. Such an increase in mutation in hybrid individuals may be a powerful factor in...
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The first aneuploid strains of Dictyostelium discoideum have been unambiguously characterized, using cytological and genetic analysis. Three independently isolated, but genetically similar, fragment chromosomes have been observed in segregants from diploids formed between haploid strains derived from the NC4 and V12 isolates of D. discoideum. Once generated, the fragment chromosomes, all of whi...
متن کاملInteractions Between Beet necrotic yellow vein virus and Beet soilborne mosaic virus in Sugar Beet
Beet necrotic yellow vein virus (BNYVV) and Beet soilborne mosaic virus (BSBMV) are members of the genus Benyvirus (9). Both viruses infect members of the family Chenopodiaceae, most notably sugar beet (Beta vulgaris L.), and are transmitted by the plasmodiophorid, Polymyxa betae (1,2). BNYVV infection causes rhizomania disease in sugar beet (4,21); however, BSBMV infection does not (28). BSBMV...
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ژورنال
عنوان ژورنال: Agricultural and Food Science
سال: 1960
ISSN: 1795-1895,1459-6067
DOI: 10.23986/afsci.71526