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Sensitivity of Lima Bean (Phaseolus limensis Macf.) Yield to ⁶⁰Co Gamma Radiation Given at Three Reproductive Stages¹

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.

Key Words: Reproductive stage • Radiosensitivity

² Research Associate and Senior Radiobiologist, respectively, Biology Department, Brookhaven National Lahoratory, Upton, New York 11973.

Received for publication November 19, 1970.