对国内外首次经过“神舟四号”宇宙飞船搭载的维生素C生产菌株进行了初筛和复筛,得到了产2-酮基-L-古龙酸(2-KLG)的高效菌株,提高了其发酵效率.经研究发现,航天搭载使大菌发生负突变,而所筛选的418株小菌中,共筛出4株高产菌株,转化率提高了3.9%～5.2%,并发现部分菌株发酵周期有不同程度的缩短. The first and second screening of the vitamin C producing strains carried by the “Shenzhou IV” spacecraft at home and abroad resulted in the production of 2-keto-L-gulonic acid (2-KLG) The fermentation efficiency was found.According to the study found that aerospace carrying negative mutation of the bacteria, and the screening of 418 strains of bacteria, a total of 4 strains of high-screening strains, the conversion rate increased by 3.9% to 5.2%, and found that some strains Fermentation cycle to varying degrees of shortening.