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I n a previous paper ( 2 ) an objective method was described for evaluating the softening effect of gamma radiation on one variety each of apples, beets, and carrots. These three types of plant tissues showed significantly different threshold dosage values but a similar radiation dosage-sof tening relationship. The latter was indicated by the similar angles of the straight lines obtained when the logarithm of dosage was plotted against softening as expressed by the percentage decrease in crushing loads.The present study was undertaken to establish whether the differences in the threshold dosages of apples and carrots were real rather than an incidental result of the particular variety or maturity chosen. Therefore the irradiation-induced softening was studied on seven varieties of apples and five varieties of carrots. Further, it was desirable to establish whether the linear log dosage-effect relationship held in the case of different varieties, since comparisons were previously made on the basis of threshold dosages derived from this linear relationship.

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