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This article in CS

  1. Vol. 11 No. 3, p. 436-437
    Received: Nov 19, 1970

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

  1. P. J. Bottino and
  2. 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.

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