THE RADIOSENSITIVITY OF TWO SPECIES OF NICOTIANA AND OF THEIR INTERSPECIFIC HYBIRD

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Bull. Torrey Botan. Club

OSTI ID:4072641

Meiselman, N; Sparrow, A H; Gunckel, J E

>Two species of tobacco, Nicotiana bigelovii and N. glauca, and their hybrid were exposed to various dose rates of chronic gamma irradiation ranging from 37.5 to 375 r per day from cobalt-60 for periods up to 39 days. Within a species, chromosomal aberration frequency at a particular dose rate showed no significant increase in successive collections from 15 to 39 days of exposure. Differences in the amount of chromosomal aberration between stocks were evident for plants at the various dose rates as well as in the controls. Bridges and fragments were found to occur with a 38% frequency in the hybrid controls, but none were found in the control samples of the parental stocks. Under chronic irradiation, N. glauca was the least sensitive, N. bigelovii was next, and the hybrid was the most sensitive. Since the increase in radiation sensitivity of the hybrid cannot be explained on the basis of relative chromosome number, it is concluded that its increased radiosensitivity must be related to the inherent rature of its genetic instability or to its reduced growth rate. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-15-020577
• OSTI ID: 4072641
• Journal Information: Bull. Torrey Botan. Club, Journal Name: Bull. Torrey Botan. Club Vol. Vol: 88: No. 1
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
NICOTIANA