航天诱变对玉簪种子萌发和幼苗生长的影响OA

To investigate the effects of space mutagenesis on seed germination and seedling growth of Hosta,seeds of Hosta plantaginea and H.ensata were used as experimental materials.The germination characteristics and early seedling growth of space carrying seeds and untreated seeds were determined.The results showed that space mutagenesis promoted seed germi-nation of H.plantaginea,with the germination index increasing by 6.7％and the germination coefficient increasing by 6.3％,showing significant differences compared with the control seeds.Space radiation significantly improved the germination rate of H.ensata seeds,with the germination index increasing by 9.5％,the peak value increasing by 29.6％,the daily average ger-mination rate increasing by 12.1％,the germination value increasing by 45.1％,the germination coefficient increasing by 10.0％,and the vigor index increasing by 10.1％,showing highly significant differences compared with the control.Space ra-diation had little effect on the early seedling growth of H.plantaginea,with no significant differences observed in growth indi-ces.For H.ensata,highly significant differences were observed in plant height,leaf length,leaf width,and leaf area between the space mutagenesis and control groups.Space mutagenesis promoted the early seedling growth of H.ensata.In conclusion,space mutagenesis induced variations in seed vigor of both H.plantaginea and H.ensata,but the two species exhibited differ-ent sensitivities to space mutagenesis,with H.ensata being more sensitive.