Kamla Kant Pandey

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Spontaneously occurring mutations of theS gene, involving both theS I and theS FI classes of alleles, were studied inNicotiana alata. The results showed that while almost all of the irradiation-induced mutants of theS gene requiredS-bearing duplication for their survival, usually in the form of a free fragment, most of the spontaneous mutants in the same(More)
Based on results of mutation studies in the fungus Schizophyllum commune, a new mechanism of the origin of genetic polymorphism is proposed. This may explain the intractable problems of the rise of multiple allelism controlling incompatibility in plants and the wide array of antibody diversity controlling immunity reaction in animals.
Colchicine treatment ofNicotiana seeds produced both genetic and nongenetic changes in the self-incompatibility reaction of the treated plants. Treatment with 0.25% colchicine produced a high number of tetraploid plants. Polyploidy brought about self-compatibility in all but one genotype ofS heterozygous constitution, which are normally self-incompatible in(More)
Interspecific crosses among 27 species ofNicotiana, including all six S.I. species of the genus, revealed a complex, but highly systematic pattern of unilateral incompatibility, apparently encompassing the whole genus. There was a definite relationship between the type of incompatibility and the site of inhibition: in interspecific incompatibility the(More)
Recent studies have shown that certain normally incompatible, interspecific combinations in the genus Populus, and intraspecific combination in Cosmos bipinnatus can be made compatible by mixing irradiation- or chemically-killed compatible pollen (mentor) with normal incompatible pollen at the time of pollination. Knox and associates have proposed that in(More)
RIFOLI U M pratense L. is a highly self-incompatible species. An oppositional Tsystem of incompatibility has been established in this species by WILLIAMS and SILOW (1933). Artificially induced autopolyploids have been produced by LEVAN (1948) and FRANDSEN (1948) and selections have been carried out for several generations to improve their fertility. But no(More)
Recent pollination experiments with highly irradiated (100,000 r) pollen in Nicotiana have shown that radiation-“pulverized” pollen chromatin can cause genetic transformation of the egg. A new model is proposed here for integration of chromatin fragments into host chromosomes. It is also proposed that heterochromatin may be involved in the process of gene(More)
One of the significant observations of recent years in the field of population genetics, highlighted by electrophoretic isozyme studies, is the presence of considerable heterozygosity within experimental and natural populations of highly inbred plants. This is found to be a general phenomenon, and is attributed to heterozygote advantage. In “Parthenogenetic(More)
Genetic transformation for egg and feather colour has been obtained in the whole animal, chicken, by the use of irradiated male gametes. In this technique recipient females are first inseminated with irradiated semen from the donor and 24h later are reinseminated with unirradiated, normal semen of the recipient strain. The transformed progeny are identical(More)