卫星搭载对紫花苜蓿当代植株生物量的影响

目的]了解卫星搭载对紫花苜蓿当代植株生物量的影响。方法]3个品系的苜蓿种子搭载"实践八号"育种卫星进行飞行。返地后,对其植株茎粗、初级分枝数及单株当年生物量等指标进行测定。结果]卫星搭载后,紫花苜蓿当代植株初级分枝数和单株生物量均显著增加,茎粗无显著变化。以高于(对照平均值+3倍标准差)为标准进行筛选,获得茎粗增加变异株2株,初级分枝增加变异株5株,单株生物量增加变异株12株。结论]获得的变异株可用于苜蓿品种改良和新品种选育,但其有利变异能否稳定遗传有待于进一步研究。

Effect of Space Flight Factors on Plant Biomass Developed from Alfalfa Seeds Carried by the Satellite

Objective] The aim of this study was to investigate the effect of space flight factors on plant biomass in the generation of alfalfa carried by the satellite.Method] Seeds from three lines of alfalfa were carried by the seedbreeding satellite Shijian-8.After the satellite returned to the ground,stem diameter,primary branch number and current-year individual biomass of alfalfa were studied.Result] After space flight,primary branch number and current-year individual biomass of alfalfa increased significantly,while the stem diameter had no significant change.Using the value>(the mean value of control + three standard deviation) as a criterion to screen,the variants with enlarged stem diameter,increased primary branch number and individual biomass was two,five and twelve respectively.Conclusion] The obtained variants can be used in the variety improvement of alfalfa and its new variety breeding,but whether its favorable variation can inherit stably to the progenies needs further study.