Sensitivity of Lima Bean (Phaseolus limensis Macf.) Yield to 60Co Gamma Radiation Given at Three Reproductive Stages1
- P. J. Bottino and
- A. H. Sparrow2
Potted plants of lima beans (Phaseolus limensis Macf. ‘Fordhook 242’) were given a series of 16-hour constant rate exposures to 60Co gamma radiation. The plants were at one of three stages of reproductive development: 1) buds in early pollen development; 2) flowers in anthesis or young pods after fertilization; and 3) large pods containing small partially developed seeds. The decreasing order of sensitivity measured as seed yield was buds, floweis or young pods, large pods. The 50% yield reduction exposures were 0.42 ± 0.43 kR for buds, 1.47 ± 0.47 kR for flowers and young pods, and 6.34 ± 0.02 kR for large pods, indicating about a 15-fold difference between the most sensitive and most resistant stage.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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