辐射技术在国产狗牙根育种中的初步应用

利用不同剂量γ辐射线不同种源的国产狗牙根进行处理。分析引进表明：①从种的水平上，狗牙根匍匐茎γ射线的半致死剂量为９０００ｒａｄｓ。②不同种源对不同剂量γ射线反应不同，处理后所有种源节间变细，但幅度不同，在６．７～２６．７％之间，高剂量处理使狗牙根节间缩短６．１％～２６．５％，叶片变短２１．８％～５２．１％，但在叶宽性状上变异方向不一，其变幅为－１５．４％～１１．８。低剂量处理对不同种源生产反应不同

Preliminary application of irradiation in breeding of Chinese Bermudagrass

Cynodon dactylon from 10 producing areas in China were irradiated with different dose of γ rays. The result showed that the semilethal dose was 9 000 rads and the shortened range of internode length varied from 6.7％ to 26. 7%. The length of internode and leaf with high-density irradiation was shortened by 6.1％～26.5％ and 21.8％～52.1％ respectively, but leaf breadth varied from －15.4％ to 11.8％. C. dactylon with low-density irradiation performed different variation in both scope and direction. It indicated that the high-density irradiation could cause the stable and expected variation. Stem color of 8.3% C. dactylon became red because of irradiation. Leaf color of 50.0％ and 40.0％ C. dactylon became deep respectively under the low and high-density irradiation respectively.