Study shows that the growth of X irradiated sunflower seeds is inversely related to the metabolism of the seeds. The actual magnitudes of the relation between the two differed for various ranges of X ray exposure. The results of the study suggested that the X rays affected the embryo

Surrey, K.

English

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December 1967	 Brief 67-10604 
AEC-NASA TECH BRIEF 
FES
AEC-NASA Tech Briefs describe innovations resulting from the research and development program 
of the U.S. AEC or from AEC-NASA interagency efforts. They are issued to encourage commercial 
application. Tech Briefs are published by NASA and may be purchased, at 15 cents each, from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Study Made of Relationship Between Growth and Metabolism

in X-Irradiated Seeds 
A study has been made of the relationship between 
the growth and metabolism of X-irradiated sunflower 
seeds. The investigation was conducted to determine 
the radiation induced changes which are directly re-
lated to, or indicative of, both the embryo and the 
cotyledons in radiosensitized seeds. 
The relationship was determined by the use of 
lipoxidase activity as an index to cotyledon metabo-
lism and hypocotyl growth as an index to the radio-
sensitivity of the embryo. 
The growth was found to be inversely related to the 
metabolism; however, the actual magnitudes of the 
relation between the two differed for various ranges 
of X-ray exposure. Growth was reduced by doses of 
up to lOOkR, but the enzyme activity remained rela-
tively stationary. Metabolism and growth both were 
reduced in the range of 100 to 400kR, and above 
400kR both completely ceased. 
". The results suggested that the X-rays affected the 
embryo (the primary radiosensitive locus). The 
amount of injury to the embryo was reflected in the 
hypoèotyl growth, and this growth process ultimately 
determined the levels of metabolism in the cotyledons 
at various stages of the seedling development. 
The embryo and cotyledons were found to inde-
pendently initiate physiological activities. Normal 
hypocotyl growth in the seed was inhibited close to 
the minimal growth level with exposures of only 60kR. 
Seven times as much radiation was required to stop
the initiation of lipoxidase metabolism in the cotyle-
dons. 
Notes: 
1. This information, the result of a research study, 
should be of interest to geneticists and horticul-
turists. 
2. Additional information may be found in: Radiation 
Research, 25, 1966, pp. 470-479; and Plant Physiol-
ogy, 39, 1964, pp. 65-70. - 
3. Inquiries concerning this innovation may be di-
rected to:
Office of Industrial Cooperation 
Argonne National Laboratory 
9700 South Cass Avenue 
Argonne, Illinois 60439 
Reference: B67-10604 
-	 -	
-	 Source: K. Surrey 
Biological and Medical Research Division 
(ARG-10046) 
Patent status: 
Inquiries about obtaining rights for commercial 
use of this innovation may be made to: 
Mr. George H. Lee, Chief 
Chicago Patent Group 
U.S. Atomic Energy commission 
Chicago Operations Office 
9800 South Cass Avenue 
Argonne, Illinois 60439
Category 04 
This document was prepared under the sponsorship of the Atomic liability resulting from the use of the information contained in this 
Energy Commission and/or the National Aeronautics and Space document, or warrants that the use of any information, apparatus, 
Administration. Neither the United States Government nor any per- method, or process disclosed in this document may not infringe pri-
son acting on behalf of the United States Government assumes any vately owned rights.
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Study made of relationship between growth and metabolism

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