苜蓿种子空间诱变生物学效应研究初报

目的]了解苜蓿种子空间诱变的生物学效应。方法]3个品系的苜蓿种子搭载"实践八号"育种卫星飞行,返地后,对其种子出苗率、株高及生长速度等指标进行测试。结果]卫星搭载对苜蓿种子有显著的诱变效应,主要表现在子叶畸变、株高变异范围和生长速度等方面。通过初步筛选,在搭载当代获得了高株变异,但该变异是否可遗传还需进一步研究确认。搭载的3个品系在子叶畸变率(10%~18%)、株高变异范围(比对照增加30%~150%)、入选变异高株数(5~7株)等方面不同,说明3个品系的搭载效率存在差异。结论]通过空间诱变可获得有价值的变异材料,服务于现代农业。

Preliminary Study on the Mutagenic Effects of Space Flight on Alfalfa Seeds

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 flight,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 exit among the three lines in mutation efficiency.Conclusion] Valuable mutated materials could be obtained by space flight and applied in modern agriculture.