The yielding capacity of mutants under different climatic conditions
1973
Gottschalk, W., Institute of Genetics, University of Bonn, Germany | Imam, M.M., Department of Botany, University of Cape Coast, Ghana
Four radiation-induced mutants of Pisum sativum were cultivated at Cape Coast and their seed production was studied and compared with their yielding potentialities in Germany and in India. Mutant 68C has an increased number of ovules per ovary as compared with the initial line. This leads to an increased number of seeds per pod under middle European climatic conditions. In India, there was no difference between the mutant and its control in this respect whereas the mutant produced fewer seeds per pod than the control in Ghana. Mutant 1201A shows an increased pod production as a consequence of the genetically conditioned stem bifurcation. It gives a better yield in comparison to the control at Bonn, Udaipur and Cape Coast whereas its productivity in Bombay was drastically reduced. The fasciated mutant 489C shows excellent yielding properties in Germany, but it is not able to produce any seeds in India because of its lateness under these climatic conditions. At Cape Coast it was fertile; however, it is necessary to determine the degree of fertility on a bigger population because of heavy damage by insect pests. These findings demonstrate the divergent response of mutated genes to different climatic and soil conditions in an obvious way. The feasibility of utilizing these genotypes in tropical and sub-tropical countries is discussed. Further trials of these strains and some of their recombinants will be carried out in Ghana in the near future.
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