Effects of Chronic and Acute Gamma Irradiation of Male Flower Buds and Mature Pollen in Quercus
Abstract:Production of pollen under chronic gamma irradiation was investigated for three Zuercus species in a forest surrounding a Cs-137 source of approximately 9500 curies. Evaluations were made after 5 months of radiation exposure and again after 17 months of exposure. In both studies pollen abortion and a delay in floral phenology increased with increasing radiation exposure. Germinable pollen was produced at all survival levels examined and no significant decrease in tube length was found. Acute irradiation of male flower buds at different stages of meiosis, and of mature pollen were reported. The radiosensitivity of microsporogenesis was evaluated by cytological scoring at anaphase I, and by pollen abortion, germination, and tube length. Both chromosome aberration and pollen abortion showed a linear increase with an increase in radiation exposure. The range of 1 kr to 4 kr was suggested as an appropriate exposure for male flower buds to be utilized in a mutation breeding program. Pollen was highly resistant to radiation when evaluated by germination and tube growth studies. No effect was found with irradiation of 100 kr; at 300 kr both germination and tube lengths depressed. At these levels germination is probably an expression of cytoplasmic growth were and not of nuclear viability. Pending additional studies the range of radiation recommended for flower buds is also suggested for the induction of mutations in pollen. No significant difference was found between species for either chronic or acute irradiation.
Document Type: Journal Article
Affiliations: Assistant Professor of Silviculture, The N.Y. State University College of Forestry at Syracuse University and Research Collaborator, Brookhaven National Laboratory
Publication date: December 1, 1964
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