苜蓿种子空间诱变生物学效应研究初报

S5; [Objective] The study aimed to understand the mutagenic effects of space flight on alfalfa seeds. [Method] Seeds of three lines of alfalfa were carried into orbit by the satellite 'Shijian-8' for space fight, the indices including seed germination rate, plant height and growth rate, were measured after the seeds been retrieved. [Result] Remarkable mutagenic effects occurred on the flight seeds, which were mainly presented by abnormal cotyledon, extended variation range of plant height and growth rate. Nineteen plants with increased plant height were preliminarily screened from the T0 progenies, but whether the mutated trait could inherit should be confirmed in further study. Three flight lines of alfalfa are different in the percentages of abnormal cotyledon (10%-18%), variation range of plant height (increased 30%-150% compared to control), selected plant number with increased plant height(5-7 plants), suggesting that differences exits between the three lines in mutation efficiency.[Conclusion] Valuable