X線処理による大麦の突然変異

概要

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The X_1 and X_2 generations of X-rayed barley seeds -were investigated and the following results were ob'tained . 1 . The difference of fertility exists arnong, spikes ,of an individual plaat in X_1 generetion. The progenies ,,of spikes with" normal fertility in X_1 genetation may ,often segregate into fertile and partially sterile plants in X_2. On the other hand, partially sterile spikes may often produce fertile plants only. 2 . Seventeen from sixty spikes obtained frorn eighteen X_1 plahts segregated structura' hybrids ; fourteen of them havd a ring of four chromosomes, two have .a ring of six and 'one has two rings of four. Seed Ifertilities of plants with a ring of four are 51. 5-74.5%, plants with a ring of six are 47.5 and 53.2%and plants with two rings of four are 48. 0%. 3 . One triploid plant and several mutants, which are male sterile , Iiguleless and short culmed , are detected . Possibility of applying BURNHAN'S multiple translocation method in barley is discussed . Cqnsidering the suspected sterility of translocation heterozygotes, a multiple translacation type with a ring of eight and a ring of six is supposed to be more applicable than that With a ring of fourteen. Procedures to iuduce such a multiple translocation type are suggested, Where repeating X-ray treatment of translocation honcLozygote might be adopted to accumulate translocatians step by step.
日本育種学会の論文
1952-06-30