THE GENERAL MORPHOLOGY AND GROWTH RESPONSES OF TWO SPECIES OF NICOTIANA AND THEIR INTERSPECIFIC HYBRID AFTER CHRONIC GAMMA IRRADIATION

Journal Article · Fri Sep 01 04:00:00 EDT 1961 · Radiation Botany

DOI:https://doi.org/10.1016/S0033-7560(61)80008-2· OSTI ID:4840629

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

Specific responses to chronic irradiation with daily doses up to 375 r/ day are described for plants of Nicotiana bigelovii (2n = 24), N. glauca (2n = 48), and N. bigelovii x N. glauca (2n = 36). Induced irregularities in the growth of stems, leaves, and buds are described and correlated with the histological appearances. The three stocks differ in degree of radiosensitivity and each has a characteristic set of responses. Sensitivity seems to be related to chromosome number since stem and leaf responses were apparent in N. bigelovii at 300 r/day after one month of exposure, in the hybrid at 150 r/day, and in N. glauca at 75 r/day. The growth habit of all three stocks changed after 300-375 r/ day for one month, but the hybrid was most affected. Histological sections of shoot apices and of axillary buds showed that loss of polarity and organization so evident in the hybrid results from the formation of enations, intumescences or tumors, and aberrant short shoots from multiple, adventitious growth centers. Induced chromosomal abnormalities and induced physiological changes are discussed as possible causal agents of the radiation responses. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.; Rutgers Univ., New Brunswick, N.J.
• NSA Number: NSA-15-030494
• OSTI ID: 4840629
• Report Number(s): BNL-5255
• Journal Information: Radiation Botany, Journal Name: Radiation Botany Vol. Vol: 1: No. 1
• Country of Publication: United States
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
CHROMOSOMES
IRRADIATION
MUTATIONS
NICOTIANA
PLANTS
QUANTITY RATIO
RADIATION DOSES
RADIATION EFFECTS
RADIOSENSITIVITY
TUMORS