GAMMA-RAY-INDUCED MUTANTS IN A JAPANESE VARIETY OF COMMON WHEAT

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Abstract
Dry seeds of Shinchunaga wheat, a Japanese cultured variety of Triticum aestivum L. ssp. vulgare (Vill.) Mackey, were irradiated with 10 to 40 kR of gamma rays from 60C. No chlorophyll mutations were detected, while such various kinds of morphological mutants as speltoid, compactoid, squareheaded, lax-spiked, dense-spiked, and others were found in the X2 through X8 generations. About 1/3 of the morphological mutants were found in the X2, another 3rd in the X3, and the remaining 3rd in the later generations. Cytological investigations indicated that most of these morphological mutants were caused by various chromosomal aberrations, such as deficiencies, telocentrics, isochromosomes, and various aneuploid constitutions.