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Reproductive features of maize zea mays tripsacum dactyloides hybrids in connection with the effect of ionizing radiation


Genetika 17(7): 1277-1285
Reproductive features of maize zea mays tripsacum dactyloides hybrids in connection with the effect of ionizing radiation
Seeds of highly apomictic varieties of Z. mays L. .times. T. dactyloides L. hybrid having 2n = 38 (20 chromosomes of maize plus 18 chromosomes of Tripsacum) were treated with .gamma.-rays at doses 10 and 30 kR and with X-rays at the dose 10 kR. Hybrids after pollination by maize produced progeny of about 95% unreduced 38-chromosome apomicts; the rest of the progeny was almost completely represented by unreduced hybrids. Treatment of all variations acclerated germination and appearance of young seedlings, but later the dose of 30 kR was lethal to all seedlings. Among the progeny of the plants which had been grown from .gamma.-irradiated seeds a statistically reliable increase in the number of unreduced hybrids was noted. Although a considerable quantity of the material (about 4000-5000 plants) was investigated, only 2 reduced hybrids were found. One of them was found among the progeny of .gamma.-irradiated plants and the other originated from X-irradiated plants. The 1st hybrid has been better studied, being characterized by the male sterility and having 2n = 28. The offspring of this hybrid obtained from 2 backcrosses with the diploid maize had the different number of chromosomes (from 2n = 20 to 2n = 28) and developed sexually.

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Accession: 006316910



Related references

Reproductive features of maize tripsacum dactyloides hybrids in relation to the effect of ionizing radiation. Soviet Genetics (English Translation of Genetika) 17(7): 845-851, 1982

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