狗牙根辐射诱变后代外部性状变异分析

对1997-2002年经过辐射诱变得到的狗牙根诱变后代的6个坪用性状指标的统计分析结果表明,1)不同的辐射诱变剂量处理的后代间坪用性状有显著差异,尤其在节间直径和密度上,6 800 rads处理的后代节间都比9 000 rads处理的后代粗,而密度是前者低于后者,2种剂量处理都可以显著降低草层高度;2)不同辐射诱变代数的后代间存在着差异,原始种源进行多代的辐射诱变,可以使得叶片显著变窄,草层高度显著降低,节间变细变长; 3)同一材料在相同辐射剂量诱变处理后匍匐茎不同节之间也存在显著的差异.

Analysis on morphological variation of mutants of Cynodon dactylon induced by radiation

Six characteristics of 37 mutants of Cynodon dactylon are analyzed in this paper,which were created by using radiation induction from 1997 to 2002.The results showed that: 1) Significant differences existed in mutants that were induced by different radiation doses,the internode diameter of mutants induced by lower doses(6 900 rads) were higher than that induced of mutants induced by higher doses(9 000 rads),and the density of the mutants induced by low dose were lower than that of mutants induced by higher doses.The turf height of mutants induced by both doses were lower than that of the untreated accessions;2) Obvious differences in physical inductive generation,and parent material occurred when induced several times by radiation,with subjects becoming erect with narrower leaves and lower turf height,with the internodes becoming thinner;3) Abundant differences existed between different nodes of the stolon of the same materials which were induced at the same time with equal radiation doses.