Distantly related hybridization and genetic engineering on crops
1985
Zhou, G.Y.
Hybrids between distantly related plants were cytologically (number and size of chromosomes) and morphologically like the maternal plant, but certain inherited changes were noted in the phenotype. The hypothesis of DNA segment hybridization has been proposed to explain this phenomenon. In China, rice had frequently been used as the maternal plant. In the author's laboratory it was found that differences exist betwen rice-sorghum hybrids and the maternal rice plant both in esterase isograms and in repetitive sequences. A technique was developed for the introduction of exogenous DNA into distantly related species. The hybrids obtained frequently segregated after a few generations became stabilized, very much similar to what one usually observed in conventional crossing. Such variations have in fact occurred in nature among different varieties of rice as well as other plants. It seems that the mobile elements like repetitive sequences or transposable segments were responsible for such phenotypic variation. This information had been exploited for gene transformation and DNA recombination studies in crops
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