小菊自交种子辐射生物学效应的研究

利用60 Coγ射线对 7个小菊品种的自交种子以 1 5Gy的剂量进行辐射处理 ,对后代的株高、花径、花色和花期等变异情况进行观察统计。结果发现 ,M1代植株平均株高明显矮化 ,获得了一批株高小于 30cm的植株 ;花径与亲本相比发生了广泛分离 ,花期因品种不同而可能推迟或提前。花色容易发生变异 ,仅有黄花和红花品种在M1代中分别有 44 9%和 48 3%的植株保留了亲本花色 ,其它花色在M1代中都不具有优势 ;除了红色花品种变异谱较窄外 ,其它花色变异谱都较宽。

EFFECTS OF IRRADIATION ON SELF-POLLINATED SEEDS IN DENDRANTHEMAMORIFOLIUM WITH SMALL INFLORESCENCES

Self-pollinated seeds of 7 small-flowered chrysanthemum (Dendranthema morifolium Tzvel.) cultivars were treated with 15Gy dose of 60Co γ-ray. Some characteristics of M 1 plants, including stem height, inflorescence diameter, flower color, florescence, etc.were studied, and a batch of plants with the stem height of less than 30cm were acquired. The results showed that the mean stem height of M 1 plants decreased obviously; inflorescence diameter had a wider variation compared with that of parental plants; whether florescence was postponed or promoted was contingent on cultivars; flower color was subject to mutation, and 44.9% and 48.3% M 1 plants from yellow- and red-flower cultivars inherited parental flower color, respectively; the mutation spectra of flower color were wide in all plants except for the plants of red flower.