Accession Number : AD0693819

Title :   EFFECT OF SPACEFLIGHT ENVIRONMENT ON SEEDS OF CERTAIN HIGHER PLANTS ON BOARD COSMOS 110,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Delone,N. L. ; Morozova,E. M. ; Antipov,V. V. ; Parfenov,G. P. ; Tpusova,A. C.

Report Date : 12 MAR 1969

Pagination or Media Count : 9

Abstract : The reactions of dry seeds to ionizing irradiation and weightlessness are being studied to provide information on the mechanism of biologic effects of spaceflight factors, especially ionizing irradiation. Reactions to an integral dose of 12 rad (average dose rate 500 mrad/day) irradiation in the Earth's radiation belts during the 22-day flight of Cosmos 110 are compared with data obtained from previous Vostok flights. The test and control seeds were subjected to cytological examination. Germination growth energy and the number of chromosome rearrangements in primary roots were compared in a variety of seeds--pine, wheat, barley, and pea. Reliable differences in rearrangements were determined only in the pine seeds. Despite the greater radiation dosage and longer weightlessness encountered on board Cosmos 110, the results did not differ significantly from those obtained in the Vostok flights. Some small physiological shifts were exhibited by the seeds during germination, and certain disturbances in their hereditary structures were noted. The need is pointed out for caution in evaluating these results; some of the differences noted may be due to experimental errors. (Author)

Descriptors :   (*SEEDS, SPACE ENVIRONMENTS), PLANTS(BOTANY), RADIATION EFFECTS, GERMINATION, CHROMOSOMES, RADIATION DOSAGE, PHYSIOLOGY, MUTATIONS, WEIGHTLESSNESS, USSR

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE