Seed resulting from self-fertilization of Nicotiana tabacum plants was tested for germination in uninterrupted darkness at monthly intervals beginning at time of harvest. All seed lots were light-requiring immediately after harvest. Some lots continued to be light-requiring, but others gradually became light-indifferent during storage under laboratory conditions. One light-requiring and one light-indifferent selection were self-pollinated, and reciprocally crossed. The seed resulting from self-fertilization was light-requiring or light-indifferent, respectively, according to the parentage. Seed resulting from the reciprocal crosses differed in dark-germinability. Further, dark-germination of seed from each of the reciprocal crosses differed from that of either parent. Both parents contributed toward light sensitivity of the seed; however, contribution of the maternal parent was greater than that of the pollen parent.