RADIOBIOLOGICAL STUDIES IN PLANTS. V. EFFECTS OF X- AND GAMMA-IRRADIATIONS ON POLLEN FERTILITY OF LYCOPERSICUM PIMPINELLIFOLIUM
Ripe pollen grains of Lycopersicum pimpinellifolium were exposed to 230 kvp x rays, and 1.17 and 1.33 Mev mixed gamma-rays from approximates Co/sup 60/ source, ranging from 10 kr to 110 kr at increments of 10 kr. According to the authors' previous study pollen grains irradiated with these dosages of x-rays germinated very well in vitro. In the present investigation, 1,207 and 203 flowers which were previously emasculated were pollinated with irradiated and nonirradiated pollen grains, respectively. The percentage of fruitsetting and the weight of fruits distinctly decreased when pollen grains were exposed to increasing doses of radiation. These fruits set few plump and viable seeds, but some small and empty seeds were obtained in numbers clearly inversely proportional to the amount of irradiation doses. Only six plump seeds were obtained in 537 fruits fertilized with irradiated pollen grains and five of them germinated. All of them had the normal number of chromosomes (2n = 24) of L. pimpinellifolium. No difference on biological effects between x and gamma- irradiation was recognized in the present experiment. (auth)
- Research Organization:
- Kyoto Univ.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-001304
- OSTI ID:
- 4773207
- Journal Information:
- Japan J. Genetics, Journal Name: Japan J. Genetics Vol. Vol: 36
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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