Abstract
(1) Three kinds of chlorophyll mutants (chlorina, basi-viridis II and virido-albina) and three others, morphological mutants (early, slender and irregular-ear) of einkorn wheat were subjected again to gamma- and X-rays. Their radiation susceptibility was examined in X1 and in X2-seedlings.
(2) Radiation sensitivity of mutant strains in the X1-generation, concerning germination or survival rate, plant height and fertility was not much different from that of the normals.
(3) In the X2-generation the frequency of chlorophyll mutation in mutant strains was the same when their germination rate was good. On the contrary, it became low, when the percentage of non-germinating heads was high. Addition of radiation injury or additional gene mutation might be the cause of the variable viability in the X2.
(4) Mutation spectrum of the mutated strains seems to be similar to that of the normal strain. About half of the chlorophyll mutants were albina.
(5) Mutations in one major gene seem to bring about a similar response to radiation as that of the normals.
