^(60)Co-γ射线诱变条斑紫菜丝状体的研究

STUDY ON USING GAMMA-RAY TO INDUCE MUTATION IN CONCHOCELIS OF Porphyra yezoensis

利用^（６０）Ｃｏ－γ射线对条斑紫菜Ｐｏｒｐｈｙｒａ ｙｅｚｏｅｎｓｉｓ 自由丝状体进行诱变。经照射后，丝 状体受到严重损伤，但部分仍具钻入贝壳的能力。部分丝状体发生颜色变异，而且后代叶状 体也表现为相同的颜色。部分未变异的丝状体在放散出壳孢子，并萌发成幼苗后也表达了 颜色变异。低剂量的照射可以促进藻体的生长，并产生形态上的变异。对照射藻体的海上栽 培实验也进行了观察和测量。

Free-living conchocelis of Porphyra yezoensis Ueda (Bangiales, Rhodophyta) was treated with ^(60)Co-γ rays of differ- ent doses (range from 100 Gy to 1000 Gy) to induce mutation. Most of the conchocelis maintained the capability of en- tering shells and forming colonies in shells, but the vitality of the conchocelis was seriously impaired by the γ irradiation. A few conchocelis showed pigment mutants of several colors. The progeny blades from conchospores of the mutants showed the same colors. However, some irradiated conchocelis did not show the change in color at the conchocelis stage. Only when conchospores of these conchocelis had germinated into young foliose thalli, could the pigment mutations be observed. Low dose (100Gy) irradiation promoted the growth of thalli of irradiated conchocelis, and many individuals with diverse morphologies were also observed. Conchospores of the irradiated conchocelis attached to the culture nets were cultured in the sea, and growth of these progenies was observed and measured.